Several tunnels to Datacenter VPN with overlapping networks
Hello guys,.
We are starting to host applications for customers who need trusts (maybe?) Windows and full access to a class C subnet in our IP data center.
My problem is most of our customers are small MOM and pop stores IPed to 192.168.1.x. I intend to install my own Cisco ASA in each of these sites and create a VPN to the data center to access the application. The last 2 sites I've done, I have re-IPed network to a mine plan. I start to run in many customers that we simply host the app for and I can't really make them Re - IP network if they do not want.
My question is what are my options here? I guess some kind of NAT, but I don't really know how it works. With a Windows trust communication must be 2 tracks. If we did not trust, I could see this work without problem with a simple NAT right? Firewall guy would you NAT on? The remote end or Data Center?
Any help and advice is appreciated.
I'm a complete network of Cisco, ASAs, catalysts, routers, etc...
Hi Billy,
Basically, for the overlap of networks, you will run natting on both sites for interesting traffic.
If you have networks that overlap, you can follow this link if you use Cisco ASA and this link for Cisco routers as a VPN endpoint devices.
Kind regards
Dinesh Moudgil
PS Please rate helpful messages.
Tags: Cisco Security
Similar Questions
-
LAN-to-LAN IPsec VPN with overlapping networks problem
I am trying to connect to two networks operlapping via IPsec. I already have google and read
http://www.Cisco.com/en/us/products/ps6120/products_configuration_example09186a0080b37d0b.shtml
Details:
Site_A use ASA 5510 with software version 8.0 (4) 32. Site_A use 10.100.0.0/24, 10.100.1.0/24 and 10.100.2.0/24 inside networks. 10.100.0.0/24 is directly connected to ASA (like vlan10), 10.100.1.0/24 and 10.100.2.0/24 are routed.
Site_B use Linux box and networks 10.100.1.0/24, 10.100.2.0/24, 10.100.3.0/24 and so on (mainly 10.100.x.0/24). I have not implemented this ASA, we took over this infrastructure without other documentation whatsoever.
According to the above link I should use double NAT. Site_B will see the Site_A as 10.26.0.0/22 networks, and Site_A see networks in Site_B as 10.25.0.0/24. Site_A is allowed access only 10.100.1.0/24 in the Site_B, and Site_B is allowed access to all the networks of the Site_A 10.100.x.0/24 - so / 22 10.26.0.0/22 mask. I would like, for example, ssh to host in the Site_B to host the Site_A using 10.26.1.222 as the destination ip address (and it should be translated in 10.100.1.222 on the side Site_A). I'm looking for something like ip nat type match-host in Cisco routers - I want to translate only a part of the network address leave the intact host Party. Anyway, following the steps from the link displayed above everything is ok until the command:
static (companyname, outside) 10.26.0.0 access list fake_nat_outbound
which translates into:
WARNING: address real conflict with existing static
TCP companyname:10.100.0.6/443 to outside:x.x.x.178/443 netmask 255.255.255.255
WARNING: address real conflict with existing static
TCP companyname:10.100.0.20/25 to outside:x.x.x.178/25 netmask 255.255.255.255
WARNING: address real conflict with existing static
TCP companyname:10.100.0.128/3389 to outside:x.x.x.178/50000 netmask 255.255.255.255
WARNING: address real conflict with existing static
TCP companyname:10.100.0.26/3389 to outside:x.x.x.181/2001 netmask 255.255.255.255
WARNING: address real conflict with existing static
TCP companyname:10.100.0.27/3389 to outside:x.x.x.181/2002 netmask 255.255.255.255
WARNING: address real conflict with existing static
TCP companyname:10.100.0.28/3389 to outside:x.x.x.178/2003 netmask 255.255.255.255
Those are redirects to port on Site_A used for mail, webmail, etc. What should I do to keep the redirects from the Internet to companyname vlan and at the same time to have work l2l ipsec tunnel linking networks that overlap?
Thank you in advance for any help or advice.
The ASA config snippet below:
!
ASA 4,0000 Version 32
!
no names
name 10.25.0.0 siteB-fake-network description fake NAT network to avoid an overlap of intellectual property
name 10.26.0.0 description of siteA-fake-network NAT fake network to avoid an overlap of intellectual property
!
interface Ethernet0/0
Shutdown
nameif inside
security-level 100
IP 10.200.32.254 255.255.255.0
!
interface Ethernet0/1
nameif outside
security-level 0
IP address x.x.x.178 255.255.255.248
!
interface Ethernet0/2
No nameif
no level of security
no ip address
!
interface Ethernet0/2.10
VLAN 10
nameif companyname
security-level 100
IP 10.100.0.254 255.255.255.0
!
interface Ethernet0/2.20
VLAN 20
nameif wifi
security-level 100
the IP 10.0.0.1 255.255.255.240
!
interface Ethernet0/2.30
VLAN 30
nameif dmz
security-level 50
IP 10.0.30.1 255.255.255.248
!
interface Ethernet0/3
Shutdown
No nameif
no level of security
no ip address
!
interface Management0/0
nameif management
security-level 100
IP 10.100.100.1 255.255.255.0
management only
!
permit same-security-traffic inter-interface
permit same-security-traffic intra-interface
object-group Protocol TCPUDP
object-protocol udp
object-tcp protocol
Group of objects in the inside network
object-network 10.100.0.0 255.255.255.0
object-network 10.100.1.0 255.255.255.0
object-network 10.100.2.0 255.255.255.0
DM_INLINE_TCP_1 tcp service object-group
port-object eq 2221
port-object eq 2222
port-object eq 2223
port-object eq 2224
port-object eq 2846
DM_INLINE_TCP_5 tcp service object-group
port-object eq ftp
port-object eq ftp - data
port-object eq www
EQ object of the https port
object-group service DM_INLINE_SERVICE_1
the eq field tcp service object
the eq field udp service object
DM_INLINE_TCP_6 tcp service object-group
port-object eq 2221
port-object eq 2222
port-object eq 2223
port-object eq 2224
port-object eq 2846
the DM_INLINE_NETWORK_1 object-group network
object-network 10.100.0.0 255.255.255.0
object-network 10.100.2.0 255.255.255.0
standard access list securevpn_splitTunnelAcl allow 10.100.0.0 255.255.255.0
outside_access_in list extended access permit tcp any host x.x.x.178 eq 50000
outside_access_in list extended access permit tcp any host x.x.x.178 eq smtp
outside_access_in list extended access permit tcp any host x.x.x.178 eq https
outside_access_in list extended access permit tcp any host x.x.x.179 DM_INLINE_TCP_1 object-group
outside_access_in list extended access permit tcp any host x.x.x.181 eq ftp
outside_access_in list extended access permit tcp any host x.x.x.181 eq ftp - data
outside_access_in list extended access permit tcp host 205.158.110.63 eq x.x.x.180 idle ssh
access extensive list ip 10.100.0.0 inside_access_in allow 255.255.255.0 10.100.1.0 255.255.255.0
inside_access_in list extended access allowed ip-group of objects to the inside network 10.100.99.0 255.255.255.0
inside_access_in list extended access allowed ip-group of objects to the inside network 10.0.30.0 255.255.255.248
inside_access_in list extended access permit tcp host 10.100.0.6 any eq smtp
inside_access_in list extended access permitted tcp object-group network inside any eq www
inside_access_in list extended access permitted tcp object-group network inside any https eq
inside_access_in list extended access permitted tcp-group of objects to the inside-network WG 1023 any eq ftp - data
inside_access_in list extended access permitted tcp-group of objects to the inside-network WG 1023 any ftp eq
inside_access_in list extended access allowed object-group objects TCPUDP-group to the network inside any eq 9999
inside_access_in list extended access allowed object-group objects TCPUDP-group to the network inside any eq 3389
inside_access_in list extended access allowed object-group network inside udp any eq field
companyname_access_in list extended access allowed ip-group of objects to the inside network 10.100.1.0 255.255.255.0
companyname_access_in list extended access allowed ip-group of objects to the inside network 10.100.99.0 255.255.255.0
companyname_access_in list extended access allowed ip-group of objects to the inside network 10.0.30.0 255.255.255.248
companyname_access_in list extended access permit tcp host 10.100.0.6 any eq smtp
companyname_access_in list extended access permitted tcp object-group network inside any eq www
companyname_access_in list extended access permitted tcp object-group network inside any https eq
companyname_access_in list extended access permitted tcp-group of objects to the inside-network WG 1023 any eq ftp - data
companyname_access_in list extended access permitted tcp-group of objects to the inside-network WG 1023 any ftp eq
companyname_access_in list extended access allowed object-group objects TCPUDP-group to the network inside any eq 9999
companyname_access_in list extended access allowed object-group objects TCPUDP-group to the network inside any eq 3389
companyname_access_in list extended access allowed object-group network inside udp any eq field
wifi_access_in list extended access permitted tcp 10.0.0.0 255.255.255.240 host 10.100.0.40 eq 2001
access extensive list ip 10.100.0.0 companyname_nat0_outbound allow 255.255.255.0 10.100.99.0 255.255.255.0
access extensive list ip 10.100.0.0 companyname_nat0_outbound allow 255.255.255.0 10.0.0.0 255.255.255.240
access extensive list ip 10.100.0.0 companyname_nat0_outbound allow 255.255.255.0 10.0.30.0 255.255.255.248
access extensive list ip 10.100.0.0 companyname_nat0_outbound allow 255.255.255.0 10.100.2.0 255.255.255.0
access extensive list ip 10.100.2.0 companyname_nat0_outbound allow 255.255.255.0 10.0.30.0 255.255.255.248
access extensive list ip 10.100.1.0 companyname_nat0_outbound allow 255.255.255.0 10.100.99.0 255.255.255.0
access extensive list ip 10.100.2.0 companyname_nat0_outbound allow 255.255.255.0 10.100.99.0 255.255.255.0
wifi_nat0_outbound to access ip 10.0.0.0 scope list allow 255.255.255.240 10.100.0.0 255.255.255.0
dmz_access_in list extended access permitted tcp 10.0.30.0 255.255.255.248 any DM_INLINE_TCP_5 object-group
dmz_access_in list extended access permitted tcp 10.0.30.0 255.255.255.248 host 10.100.0.2 object-group DM_INLINE_TCP_6
dmz_access_in list extended access allowed object-group DM_INLINE_SERVICE_1 10.0.30.0 255.255.255.248 object-group DM_INLINE_NETWORK_1
dmz_access_in list extended access deny ip 10.0.30.0 255.255.255.248 all
access extensive list ip 10.0.30.0 dmz_nat0_outbound allow 255.255.255.248 10.100.0.0 255.255.255.0
access extensive list ip 10.0.30.0 dmz_nat0_outbound allow 255.255.255.248 10.100.99.0 255.255.255.0
access extensive list ip 10.0.30.0 dmz_nat0_outbound allow 255.255.255.248 10.100.2.0 255.255.255.0
outside_1_cryptomap to access extended list ip 10.26.0.0 allow 255.255.252.0 10.25.0.0 255.255.255.0
access extensive list ip 10.100.0.0 fake_nat_outbound allow 255.255.252.0 10.25.0.0 255.255.255.0
IP local pool clientVPNpool 10.100.99.101 - 10.100.99.199 mask 255.255.255.0
IP verify reverse path inside interface
IP verify reverse path to the outside interface
IP audit name IPS attack action alarm down reset
IP audit name IPS - inf info action alarm
interface verification IP outside of the IPS - inf
verification of IP outside the SPI interface
NAT-control
Global (inside) 91 10.100.0.2
Global (inside) 92 10.100.0.4
Global (inside) 90 10.100.0.3 netmask 255.255.255.0
Global interface 10 (external)
Global x.x.x.179 91 (outside)
Global x.x.x.181 92 (outside)
Global (outside) 90 x.x.x.180 netmask 255.0.0.0
interface of global (companyname) 10
Global interface (dmz) 20
NAT (outside) 10 10.100.99.0 255.255.255.0
NAT (companyname) 0-list of access companyname_nat0_outbound
NAT (companyname) 10 10.100.0.0 255.255.255.0
NAT (companyname) 10 10.100.1.0 255.255.255.0
NAT (companyname) 10 10.100.2.0 255.255.255.0
wifi_nat0_outbound (wifi) NAT 0 access list
NAT (dmz) 0-list of access dmz_nat0_outbound
NAT (dmz) 10 10.0.30.0 255.255.255.248
static (companyname, outside) tcp https 10.100.0.6 https interface subnet 255.255.255.255 mask
static (companyname, outside) tcp interface smtp 10.100.0.20 smtp netmask 255.255.255.255
static (companyname, outside) interface 50000 10.100.0.128 TCP 3389 netmask 255.255.255.255
static (companyname, external) x.x.x.181 2001 10.100.0.26 TCP 3389 netmask 255.255.255.255
static (companyname, external) x.x.x.181 2002 10.100.0.27 TCP 3389 netmask 255.255.255.255
static (companyname, outside) interface 2003 10.100.0.28 TCP 3389 netmask 255.255.255.255
static (dmz, outside) tcp x.x.x.181 ftp 10.0.30.2 ftp netmask 255.255.255.255
static (companyname, companyname) 10.100.1.0 10.100.1.0 netmask 255.255.255.0
static (companyname, companyname) 10.100.2.0 10.100.2.0 netmask 255.255.255.0
inside_access_in access to the interface inside group
Access-group outside_access_in in interface outside
Access-group companyname_access_in in interface companyname
Access-group wifi_access_in in wifi interface
Access-group dmz_access_in in dmz interface
Route outside 0.0.0.0 0.0.0.0 x.x.x.177 1
Companyname route 10.0.1.0 255.255.255.0 10.100.0.1 1
Companyname route 10.100.1.0 255.255.255.0 10.100.0.1 1
Companyname route 10.100.2.0 255.255.255.0 10.100.0.1 1
dynamic-access-policy-registration DfltAccessPolicy
!
Crypto-map dynamic outside_dyn_map 20 set pfs
Crypto-map dynamic outside_dyn_map 20 the transform-set ESP - 3DES - SHA TRANS_ESP_3DES_MD5 value
life together - the association of security crypto dynamic-map outside_dyn_map 20 28800 seconds
Crypto-map dynamic outside_dyn_map 20 kilobytes of life together - the association of safety 4608000
PFS set 40 crypto dynamic-map outside_dyn_map
Crypto-map dynamic outside_dyn_map 40 value transform-set ESP-3DES-SHA
life together - the association of security crypto dynamic-map outside_dyn_map 40 28800 seconds
Crypto-map dynamic outside_dyn_map 40 kilobytes of life together - the association of safety 4608000
Crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 value transform-set ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA MD5-ESP-3DES ESP-DES-SHA ESP-DES-MD5
Dynamic crypto map SYSTEM_DEFAULT_CRYPTO_MAP 65535 define security association lifetime 28800 seconds
cryptographic kilobytes 4608000 life of the set - the association of security of the 65535 SYSTEM_DEFAULT_CRYPTO_MAP of the dynamic-map
card crypto outside_map 1 match address outside_1_cryptomap
card crypto outside_map 1 set pfs Group1
outside_map 1 counterpart set a.b.c.1 crypto card
card crypto outside_map 1 set of transformation-ESP-3DES-SHA
map outside_map 20-isakmp ipsec crypto dynamic outside_dyn_map
outside_map interface card crypto outside
!
internal DefaultRAGroup group strategy
attributes of Group Policy DefaultRAGroup
value of server WINS 10.100.0.3
value of server DNS 10.100.0.3
nom_societe.com value by default-field
internal DefaultRAGroup_1 group strategy
attributes of Group Policy DefaultRAGroup_1
value of server DNS 10.100.0.3
Protocol-tunnel-VPN l2tp ipsec
internal group securevpn strategy
securevpn group policy attributes
value of server WINS 10.100.0.3 10.100.0.2
value of 10.100.0.3 DNS server 10.100.0.2
VPN-idle-timeout 30
Protocol-tunnel-VPN IPSec
nom_societe.com value by default-field
attributes global-tunnel-group DefaultRAGroup
address clientVPNpool pool
authentication-server-group COMPANYNAME_AD
Group Policy - by default-DefaultRAGroup_1
IPSec-attributes tunnel-group DefaultRAGroup
pre-shared-key *.
tunnel-group securevpn type remote access
tunnel-group securevpn General attributes
address clientVPNpool pool
authentication-server-group COMPANYNAME_AD
Group Policy - by default-securevpn
tunnel-group securevpn ipsec-attributes
pre-shared-key *.
tunnel-group securevpn ppp-attributes
ms-chap-v2 authentication
tunnel-group a.b.c.1 type ipsec-l2l
a.b.c.1 group tunnel ipsec-attributes
pre-shared-key *.
Are you sure that static-config does not make to the running configuration?
By applying this 'static big' you're essentially trying to redirect the ports, which have already been transmitted by the rules in your existing configuration. This explains the caveat: what you are trying to do has some overlap with existing static.
(Sorry for the use of the transmission of the word, but this behavior makes more sense if you look at it like this; although "port forwarding" is not Cisco-terminology.)
But... whenever I stumbled upon this question, the warning was exactly that: a WARNING, not an ERROR. And everything works as I want it to work: the specific static in my current config simply have priority over static grand.
If you would like to try to do the other opposite you would get an error (first static major, then try to apply more specific) and the config is not applied.
So could you tell me the config is really not accepted?
-
Problem VPN site to Site with overlapping networks
We currently have a PIX 515E firewall as a headboard with many tunnels of site-to-site configured for her with the enpoints of PIX 506. Our internal LAN addressing scheme is 172.18.0.0 255.255.0.0. Addresses of local network in two of the remote networks with congigured VPN site-to-site are 172.18.107.0 255.255.255.224 and 172.18.107.32 255.255.255.0. Remote network access to all services on our internal network very well. We have 20 other network segments configured the same way. The 172.18.107.32.0 network needs to communicate with the 172.18.107.0 network for the services of file on the other remote PIX. Since the station PIX will not allow traffic to leave the same interface it came we thought with him we would just set up a tunnel from site to site between the two remote LAN. After the configuration of the site to another remote firewalls do not appear to try to establish tunnels when sending valuable traffic. I turned on debug for ISAKMP and nothing is either sent or received on a remote Firewall with regard to these tunnels. It's almost like since we already have a tunnel set to our 172.18.0.0 internal LAN that the remote PIX will not build specifically to 172.18.107.0 tunnel. I am able to ping each remote peer with each other and hear protection rules, but nothing has ever been established.
Is what we are trying to do possible? Sorry for the long post but the kind of a strange scenario. Thanks in advance for any help.
In what order are the numbers of seqence card crypto for configuring vpn on pix distance units? It could be that you are trying to install is a lot and will be checked later as head of pix. If this is the case, then yes the 172.18/16 road prevail the 172.18.107/24. Try to rebuild the entrance card crypto with a lower number so that traffic to 172.18.107/24 comes first.
I would like to know how it works.
-
VPN access to site-toSite to servers of HO with remote site with overlapping network...
Hi all
I have an obligation to create a tunnel vpn site-to-site on ASA 5510 from a remote location to my HO, I have already other site to site tunnels are on the rise and running on the ASA. This is what my remote site got the network address that is part of a subnet used in HO(192.168.10.0/24). My requirement is only my need to access remote site couple of my servers in HO, who is in the subnet 192.168.200.0/24.
Veuileez help how can I achieve this... your advice at the beginning is very appreciated...
Thanks in advance
MikaelHi Salem,
I think the installer at your end is a bit like this:
You want the remote location to access the subnet 192.168.200.0/24 behind the ASA HQ servers. In this case, you can NAT traffic from the remote site to a different subnet when you go to 192.168.200.0/24.
i.e. the 192.168.10.0/24 subnet resemble 192.168.51.0/24 when he goes to 192.168.200.0
This can be done by using political based natting:
permit access-list policy-nat ip 192.168.10.0 255.255.255.0 192.168.200.0 255.255.255.0
public static 192.168.51.0 (inside, outside) access-l policy-nat
In the encryption of the remote side access list, you will have:
cryptoacl ip 192.168.51.0 access list allow 255.255.255.0 192.168.200.0 255.255.255.0 (this is because the remote side will see 192.168.51.0/24 and not the 192.168.10.0/24)
Similarly on the end of HQ the accesslist crypto will be
XXXXX 192.168.200.0 ip access list allow 255.255.255.0 192.168.51.0 255.255.255.0
Please try this and let me know if it helps.
Thank you
Vishnu Sharma
-
Several Tunnels with the same distance network & destination in cryptographic maps
This maybe a newbie question, but I don't have production systems and don't really have a way to test our properly. We have an ASA 5520 with several tunnels from site to site. We already have a tunnel with one of the remote networks in 10.100.90.14. We have this IP on a subnet configured as remote network and the destination address in the card encryption. We also exempt rules NAT in place for our local network with the 10.100.90.14 address as the destination.
We have another tunnel that must be built and who will have a different address peer, but that requires a large number of subnets and at least we'll have the same remote network/destination address in the map encryption and VPN tunnel that we already have in place.
Is this possible to do with a tunnel of site to another without a static or dynamic NAT to a different IP address?
I know, with physical networks, that it is impossible because of the static routes that are in place, but with the ipsec tunnels I'm not sure how it works, and as mentioned, I'm not able to test it.
Any guidance would be appreciated.
Bill
The acl crypto map defines interesting traffic. If you have the same destination IP address, IE. 10.100.90.14 then if the source IE. the IP address of the client on your network is identical for the two tunnels, then no, it won't work and you will need to make some sort of NAT for one of the tunnels.
Jon
-
VPN router to router with overlapping of internal networks
Hello Experts,
A small question. How to configure a VPN router to router with overlap in internal networks?
Two of my internal networks have ip address 192.168.10.0 and 192.168.10.0
No link or config will be appreciated. I searched but no luck.
Thank you
Randall
Randall,
Please see the below URL for the configuration details:
Configure an IPSec Tunnel between routers with duplicate LAN subnets
http://www.Cisco.com/en/us/Tech/tk583/TK372/technologies_configuration_example09186a00800b07ed.shtml
Let me know if it helps.
Kind regards
Arul
* Please note all useful messages *.
-
Easy VPN with the Tunnel Interface virtual IPSec dynamic
Hi all
I configured easy vpn remote on a cisco 1841 and dynamic server easy vpn with virtual tunnel interface on the server (cisco 7200, 12.4.15T14)
It works with easy vpn remote to the client mode and mode network-extesión, but it doesn't seem to work when I configure mode plus network on the client of the cpe, or when I try to have TWO inside the ez crypto interfaces. On the customer's site, I see two associations of security, but on the server PE site only security SA!
Without virtual dynamic tunnel interface, dynamic map configuration is ok... This is a limitation of the virtual tunnnel dynamic interface?
Federica
If one side is DVTI and the other uses a dynamic map, it does support only 1 SA. If the two end uses DVTI or the two end uses dynamic card then it supports several SAs.
Here is the note of documentation for your reference:
Note: Multiple inside interfaces are supported only when the Cisco Easy VPN server and the Cisco Easy VPN client have the same type of Easy VPN configuration. In other words, both must use a Legacy Easy VPN configuration, or both must use a DVTI configuration.
Here's the URL:
Hope that answers your question.
-
With the help of Client VPN dial-up networking on L2l
I m tring to configure ASA 5505 with Cleint of VPN to access a remote network on a L2L with an another ASA 5505, but without success. There is a special function for this work?
Follow the topology
TKS
Hello
You must ensure that you have configured following
- permit same-security-traffic intra-interface
- This will allow VPN Client traffic to enter the ASA and leave the same interface
- If you use Split Tunnel ACL with the VPN Client, make sure that the ACL has included Remote Site network
- If you use complete Tunnel this wont be a problem
- Make sure that the ACL of VPN L2L that defines "interesting traffic" includes the pool of Client VPN on both sides of the VPN L2L
- Configure a NAT0 on the ASA of Client VPN 'outside' interface that makes NAT0 for pool of Client VPN Remote Site network
If you have a real-world setting to share I can try to help with those. Otherwise I can only give general things like the above to check.
-Jouni
- permit same-security-traffic intra-interface
-
Using the same set processing on several site to site VPN tunnels
Hi all. I have a rather strange situation about site-to-site VPN tunnel.
On the one hand, I have a PIX 501 and on the other end an ASA5505 and a tunnel set up between them.
The problem is that on the side of the PIX, I can't establish a tunnel, but when the traffic starts on the side of the ASA the tunnel established as usual.
I checked the configurations on both ends and keys, passwords, mirror that LCD seems OK. The only thing that comes to my attention, it's that I have the same set of transformation used for 2 different tunnel on the side of PIX.
Can I use the same set of transformation on several tunnels or should I set a different transformation for each tunnel? Could be the source of the problem?
Use it on PIX
card crypto set pfs group2
Or on ASA, use:
card crypto set pfs Group1
-
supported vs IPSec VRF taking crypto maps for several tunnels
Hi all!
I came to know that we can use the same public ip address for the creation of several tunnels to different websites using crypto-cards featuring many lines each representing a reference to a particular tunnel and using vrf aware IPsec, but I would like to know what are the differences / advantages / cautions.
Thanks for your time
Murali.
Murali
That I understand the feature essentially allows you to have multiple IPSEC tunnels and traffic in the tunnel that is to say. source and destination IP of the high-end devices can be in different VRF.
So it works mainly with the MPLS VPN IE. If you had several MPLS VPN each with their own VRF you can then run ISPEC tunnels on the MPLS network and when packets are received, they are automatically in the correct VRF.
You could not do that normal crypto cards IE. You can cancel again several IPSEC tunnels on a public IP address but then everything would be traffic in the same global routing table.
If the benefit is basically the same that you get with any VRF installation IE. logical separation of traffic on a single device.
Can't really say much about the warnings as I've never used it but there are some restrictions.
See this link for more details-
Jon
-
How to get several standard via ipsec vpn subnet?
Dear all,
I have this scenario:
A - Hand router
Cisco 881
private network: 10.10.10.0/24
private address: 10.10.10.2
address: xxx.xxx.xxx.xxx
B branch office router
DrayTek vigor 2600
private network: 100.100.100.0/24
private address: 100.100.100.1
sound: .yyy
C - seat router
range Cisco 1800 (no access - not mine)
private network: 10.10.10.0/24
private address: 10.10.10.1
D another subnet in HQ
private network: 10.20.20.0/24
available in C
There is a standard VPN ipsec from A to B due interoperability and compatibility between cisco and draytek. the vpn is in place and works very well.
D is accessible from a C: hole
#ping router ip 10.20.20.15 source vlan 1
Type to abort escape sequence.
Send 5, echoes ICMP 100 bytes to 10.20.20.15, wait time is 2 seconds:
Packet sent with the address 10.10.10.2 source
!!!!!
Success rate is 100 per cent (5/5), round-trip min/avg/max = 52/56/64 msNow, I need reach D from B.
I configured adding the 10.20.20.0/24 routing via vpn subnet B and tested the connection replacing the cisco 881 (A) with an another drytek vigor 2820; Add a static route in the drytek 2820 (10.20.20.0 via 10.10.10.1) make B able to reach successfully the D with ping 10.20.20.15.
After that I tried to divide the acl of tunnel and ping in vain 10.20.20.15 d, I noticed a match in acl:
Router #sh ip access list 101
Expand the access IP 101 list
10 permit ip 10.10.10.0 0.0.0.255 100.100.100.0 0.0.0.255 (3298 matches)
20 permit ip 10.20.20.0 0.0.0.255 100.100.100.0 0.0.0.255 (14 matches)I also tried to prevent NAT from D to B without any match in acl after unsuccessful ping 10.20.20.15 d.
Any suggestion is appreciated.
Gianluca
Hanks for the additional info
So what is happening is the traffic is not getting encrypted, it is hitting the crypto acl but not getting not encrypted
I know you would have checked it already, but please just check once more the entrance to nat and see if you have a deny for this traffic in the acl, nat
We need to know why the tunnel isn't coming for this traffic
could you please confirm wht is crypto ACLs on the other end, that's exactly the mirror image (2 acl), I don't know how the configuration is made at the other end
give the following debug command
Debug ip counterpart condition crypto / / if you have several tunnels will do conditional debugging
Crypto ipsec its debug debug crypto or her (who was never there I think it's a bit confusing)
one thing you can try if down the tunnel is also an option, just erase this tunnel using cry clear isa his id and disable remote session encryption and bring it and see if it happens
Finally, given that I don't know how the other end is configured just try this as the encryption, ACLs on both ends
10.0.0.0 0.255.255.255 100.100.100.0 0.0.0.255
and the reverse on the other end and now try to brining of the tunnel to the top
-
ASA vpn with a public ip address different addresses
Hello world. I can not find someone who can give me an answer 'for sure' of this thing. I want to connect via vpn ASA5505, called 2A and b. inside one we have net 10.0.0.0/24 and 10.0.1.0/24 net b. now, we can have 2 outside for one ip addresses (e.g. 215.18.18.10 and 222.26.12.12) because we have 2 providers to connect to the internet. the asa can follow 2 VPN - with the same cryptomap for the destination inside) so that if a grave he will switch to the other vpn by itself?
This thing can be done with other cisco devices (for example, a 2800 series router?)
Thank you very much
Who are you looking to
1. If the failure of the connection to B then A will use secondary WAN connection to try to raise the tunnel.
I would use the backup ISP for this function.
2. If the connection to A failed then B will try to set up the tunnel with secondary address peer.
You can set several counterparts by using cryptographic cards to provide redundancy
-
Using Cisco VPN with desktop remotely
Hi, I work with many customers that use Cisco VPN for remote access. Unfortunately the Cisco VPN does not work well with my VPN IBM client so I can't have both running on my computer. So, I thought that I would like to install the Cisco VPN on an old machine, connect to this computer via desktop to distance and VPN in the network from the customer via the VPN.
Well, who does not work either. As soon as I connect to the network via the VPN Remote Desktop client loses the connection. Can someone tell me if it works as designed (WAD) or if there is a secret of configuration to operate?
Thanks in advance...
John,
When you connect via VPN to the network client on the remote computer, the connection RD proper case?
I think it's because the VPN connection that you have drawn on the client computer is configured to encrypt all traffic, and that's why the RD connection to your computer of the drops.
You can do a quick test... on the VPN client computer under statististics (VPN software) verification and check if secure roads is 0.0.0.0 (no split tunneling).
If Yes... and if having access to the VPN server, which can be changed.
Federico.
-
IPSEC VPN with Dynamics to dynamic IP
Hello
I tried IPSEC VPN with dynamic IP to dynamic (router to router) for some time. But still can not auto-établir the tunnel.
Is someone can you please tell me if it is possible to do?
If so, please share with me the secret to do work.
Thank you!
Best regards
Rather than the Crypto map, I would use the profile of Crypto. Then, establish you an IPSEC tunnel. The beauty of the profile, is that you can run through it routing protocols, and you do not have to change constantly the cards whenever you change the topology of the network. The "* * *" in the timer event is "minute hour day week month" so "* * *" is updated every minute. In Tunnel destination, it's an IP address, not a hostname that is stored, but when you set it, you can put in a HOST name and it converts to the moment where you configure it to an IP address.
So, if you type:
config t
interface tunnel100
destination remote.dyndns.com tunneloutput
See the race int tunnel100
It shows:
interface Tunnel100
tunnel destination 75.67.43.79That's why the event handler goes and becomes the destination of tunnel every minute what ever the DDNS says that is the new IP address.
I have seen that two of your routers running DDNS. They will have to do this.
Local router:
crypto ISAKMP policy 1
BA aes 256
preshared authentication
Group 2
ISAKMP crypto key XXXXXXX address 0.0.0.0 0.0.0.0 no.-xauth
!
!
Crypto ipsec transform-set ESP-AES-SHA esp - aes 256 esp-sha-hmac
!
Profile of crypto ipsec CRYPTOPROFILE
game of transformation-ESP-AES-SHA
!
interface Tunnel100
Description of remote.dyndns.org
IP 10.254.220.10 255.255.255.252
IP virtual-reassembly
IP tcp adjust-mss 1400
source of Dialer0 tunnel
tunnel destination 75.67.43.79
ipv4 ipsec tunnel mode
Tunnel CRYPTOPROFILE ipsec protection profileIP route 192.168.2.0 255.255.255.0 10.254.220.9
Change-tunnel-dest applet event handler
cron-event entry timer cron name "CHRON" * * *"
command action 1.0 cli 'enable '.
action 1.1 cli command "configures terminal.
Action 1.2 command cli "interface tunnel100".
Action 1.3 cli command "destination remote.dyndns.org tunnel".
!--------
Remote router:
crypto ISAKMP policy 1
BA aes 256
preshared authentication
Group 2
ISAKMP crypto key XXXXXXX address 0.0.0.0 0.0.0.0 no.-xauth
!
!
Crypto ipsec transform-set ESP-AES-SHA esp - aes 256 esp-sha-hmac
!
Profile of crypto ipsec CRYPTOPROFILE
game of transformation-ESP-AES-SHA
!
interface Tunnel100
Description of local.dyndns.org
IP 10.254.220.9 255.255.255.252
IP virtual-reassembly
IP tcp adjust-mss 1400
source of Dialer0 tunnel
tunnel destination 93.219.58.191
ipv4 ipsec tunnel mode
Tunnel CRYPTOPROFILE ipsec protection profileIP route 192.168.1.0 255.255.255.0 10.254.220.10
Change-tunnel-dest applet event handler
cron-event entry timer cron name "CHRON" * * *"
command action 1.0 cli 'enable '.
action 1.1 cli command "configures terminal.
Action 1.2 command cli "interface tunnel100".
Action 1.3 cli command "destination local.dyndns.org tunnel".Thank you
Bert
-
IPSec VPN with private WAN address... Help!
I am trying to establish an IPSec Site to Site VPN to my company network. I use a Cisco 2811. If I plug a Public IP WAN connection my tunnel past traffic without problem, but if I tell a router in the middle where the 2811 pulls a private IP address of the home router I no longer get a tunnel a success. Any suggestion?
I have the following instructions.
FA 0/0
DHCP IP ADDRESS
CRYPTO MAP AESMAPVLAN 1
IP ADDRESS XX. XX. XX. XX 255.255.255.240 (public IP)IP ROUTE 0.0.0.0 0.0.0.0 FA 0/0
If this can help clerify the "router" is a CradlePoint (CRT500) that takes the Mobile 3 G and send it to an ethernet port on the WAN port on my router. The installation remains mobile and I rarely get the chance to have a public IP address for my WAN. Currently I use a SonicWall TX 100 router that allows me to VPN to my network of companies. We hope to move all of our mobile kits to the cisco product, but need to find a solution before change can occur.
If I do 'Show IP Crypto ISAKMP SA' it shows: XX. XX. XX. XX (PUBLIC) <> Active 192.168.0.1.
My thoughts are that my TCP 500 traffic to the VPN router and when the VPN router sends traffic to the address there SA with it's no the case because it is an ip address private. Limited my knowledge of the works of the VPN, I think only in Phase 1, two addresses must "bind" and NAT cannot be used with VPN? But I keep out hope that this might be a somewhat common question and there is a procedure in place to get around, or maybe I'm just a bad configuration or IP road...
When I disable card crypto on the FA 0/0 and add NAT to the FA 0/0 and 1 VLAN more change my IP Route to "0.0.0.0 0.0.0.0 192.168.0.1" I get non - vpn connectivity. Also, I put the address that gets my FA 0/0 in the DMZ of the Cradlepoint.
Thanks for any help anyone can provide!
Brandon,
NAT - T is designed to overcome the problems of NAT/PAT, known in the world of IPv4.
The big problem is that if you have a public IPv4 address, you will need to run PAT. Packages ESP / AH do not have a port number so that they cannot be PATed. To do this, we enacapsulate IPsec payload inside udp/4500 packages.
That being said, some providers overcome this problem differently, but it's not THE standard way.
Your head should see you as PublicIP facig of internet device.
I agree, that both sonicwall and IOS should work with other IOS. At the same time, it is difficult to say what is happening in the middle.
I would say that if possible, connect you to a case of TAC, the guys will be able to view your configs and able to solve the problem when it's there. These types of discussions on the forums can go for very long ;-)
Marcin
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