VPN ACL
How would I go about filtering out access to a port of a Cisco ASA vpn<>
By default, it seems that the VPN does not use the ACL on the external interface.
Thank you
As much as I know, that you can not. If you want to restrict to a certain group of users, you will need to apply the filter on the router upstream if you manage it. If the ISP handles this router for you, they may be able to do something for you.
Jon
Tags: Cisco Security
Similar Questions
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VPN ACL &; super networks
This should be a pretty simple question. With a tunnel can VPN you specify a wider range of IP addresses in the list to access such as 10.1.0.0/8 which accepts traffic from smaller subnets in this range like 10.1.3.0/24?
I don't know if the ACL check just the IP address, or if the subnet mask must be the same one.
For vpn traffic great nets will be read and processed, in other words if you set an address for correspondence as:
IP 10.0.0 allow 0.255.255.255 172.16.0.0 0.0.255.255
This will include the whole 8 subnets of 10 and 16 all of the subnets of the 172 to send on this tunnel.
Be careful when you use this part of the traffic you want to can be on this game.
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Hello
I have asa 5512-x
ASA 9.1 version 2
ASDM version 7.2 (1)
I'm not really good with a syntax of cisco, so I use asdm
I created a split tunnel remote ipsec vpn with cisco vpn client
the purpose is to allow vpn for LAN traffic
and to allow the vpn to a public Web site traffic
so I set the two objects and added to the exemption of split tunnel (the names of the objects: 'LAN', 'Rackspace')
access to the local network is ok, access to a Web site does not work
I guess I have some missing nat/ACL,
can someone explain to me please in the most simple way to do this?
Thank you very much
Hello
What is subnet
network of the NETWORK_OBJ_172.18.0.0_26 object
255.255.255.192 subnet 172.18.0.0This 'nat' configuration seems strange
NAT (LAN, WAN1) source static Tunnel VPN VPN Tunnel static destination NETWORK_OBJ_172.18.0.0_26 NETWORK_OBJ_172.18.0.0_26 non-proxy-arp-search to itinerary
When you see that the source for the "nat" interface is 'LAN' and source networks are those configured under "Tunnel VPN" it seems to suggest that this NAT configuration transmits traffic destined to 'LAN' and 'rackspace' to the 'LAN' interface. It is naturally very good for the subnet configured under 'LAN' , but the 'rackspace' to my knowledge is located behind an external interface of the ASA correct? But I guess I really need to know this as the subnet that I mentioned at the beginning of the post (which is used in this configuration NAT too)
What is the interface to which the VPN users connect to? WAN1 or DSL? Although the following list what the map interface Crypto is attached
See the crypto run map
You can also list the output of the following command
See the establishment of performance ip local pool
-Jouni
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Adding networks to the tunnel VPN ACL
Hello. On a remote location, I have to add additional networks access to our networks to the central location and I was wondering is it as simple as the addition of these networks to ACL on both sides of the tunnel to allow access or is there something more to do? I just want to be sure because it is so simple.
VPN is the site to site.
Thanks in advance for any help.
Add traffic to your acl crypto of interesting traffic and your nat exemption acl.
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Hello
There is an "acl" parameter that is not clear to me, it is configured at customer site:
Crypto ipsec VPN ezvpn client
connect auto
Cisco key band EASYVPN
client mode
peer 10.0.0.1
username cisco password cisco
xauth userid local mode
ACL 101
Everything that I added to the ACL 101 tunnel is always present. I found a description:
Step 6
ACL {name - acl |} ACL-number}
Example:Device (ezvpn-crypto-config) # acl acl-list1
Specifies several subnets in a VPN tunnel.
"Specifies several subnets in a VPN tunnel". -what it means, source?
I tried to use this setting, and I added the access list:
access-list 123 allow ip 10.10.10.0 0.0.0.255 host 20.0.0.20
access-list 123 allow ip 50.50.50.0 0.0.0.255 host 20.0.0.20
where 10.10.10.0 and 50.50.50.0 are source and 20.0.0.20 is the destination.
When I ping with source 10.10.10.3 (physical int) for 20.0.0.20 - numbers of BA & desc packages grows.
but when I ping with source 50.50.50.50 (int loop) for 20.0.0.20 - I see that it wasn't to push into the tunnel.
Could someone explain how the work parameter and for what is it?
Thank you
Hubert
Hubert,
Ref:
in client mode several subnets are not supported, nor what they sense.
You specify what internal subnets of announcement to the server that are configured behind this device.
In client mode, the server sees only the assigned IP address.
M.
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2911 + VPN + Acl client
Hello.
I have cisco IOS users 2911 15.0 connecting with customer VPN. But I have trouble with the ACL configuration.
Lets see the config.
AAA authentication login userauthen local
AAA of authentication ppp default local
AAA authorization groupauthor LAN
!
0 user username password Cisco
crypto ISAKMP policy 30
BA 3des
preshared authentication
Group 2
ISAKMP crypto client configuration group vpnclient
key cisco123
DNS 10.0.0.10
WINS 10.0.0.20
igok.com field
pool ippool
ACL SPLIT_TUNNEL
!
Crypto ipsec transform-set esp-3des DMVPN-TR
transport mode
Crypto ipsec transform-set esp-3des esp-md5-hmac RIGHT
!
Crypto-map dynamic dynmap 10
Set transform-set RIGHT
market arriere-route
!
map clientmap client to authenticate crypto list userauthen
card crypto clientmap isakmp authorization list groupauthor
client configuration address map clientmap crypto answer
10 ipsec-isakmp crypto map clientmap Dynamics dynmap
!
interface GigabitEthernet0/0
Description = Inet is-
address IP xx.xx.xx.xx 255.255.255.240
NAT outside IP
IP virtual-reassembly
automatic duplex
automatic speed
clientmap card crypto
!
interface GigabitEthernet0/2
the IP 10.0.0.1 255.255.255.0
IP access-group FromLAN in
IP nat inside
IP virtual-reassembly
automatic duplex
automatic speed
!
IP local pool ippool 192.168.130.1 192.168.130.200
overload of IP nat inside source list 130 interface GigabitEthernet0/0
FromLAN extended IP access list
permit tcp any any eq www
permit any any eq 443 tcp
permit tcp any any eq ftp
permit tcp any any eq 22
allow udp any any eq ntp
allow udp any any eq field
If I put there allowed without LOG all packets to vpn users is denied. If I add packages to NEWSPAPERS should allow.
IP enable any 192.168.130.0 0.0.0.255 connect
IP enable any any newspaper
Why should I add the NEWSPAPER?
If I withdraw this interface access list - packest will not!
SPLIT_TUNNEL extended IP access list
Licensing ip 10.0.0.0 0.0.0.255 any
permit ip 192.168.2.0 0.0.0.255 any
!
access-list 30 allow 10.0.0.0 0.0.0.255
access-list 130 deny ip 10.0.0.0 0.0.0.255 192.168.130.0 0.0.0.0255
access-list 130 allow ip 10.0.0.0 0.0.0.255 any
Hi Sebastian,.
Just a sensor, I would first try and disable cef and try again.
I would like to know if it works.
Thank you
Varun
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All,
The situation is that I'm trying to initiates a connection outside a Firewall ASA, to a destination IP address that is on the remote end of a VPN tunnel looked SAA even on the external interface. So logically slow traffic is outside to outside.
The SAA is to deny the traffic that the conversation shows the source as the destination and the outside outside.
Is there something smart, that I can do on the SAA to solve this problem?
Thank you
D
Hello
Use the following command on the ASA:
permit same-security-traffic intra-interface
Kind regards
Aditya
Please evaluate the useful messages and mark the correct answers.
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I'm confused about the ACL for the ipsec traffic. The phase 1 and Phase 2 work correctly [no error].
I've separated the nat no ACL and interested traffic such as recommended.
access-list outside_1_cryptomap
access-list inside_nat0_outbound
NAT (inside) 0-list of access inside_nat0_outbound
card crypto outside_map 1 match address outside_1_cryptomap
I do a ping of source to the other side (ip to ip) and the #pkts decaps and (#pkts :) program increment as expected.)
4 packs get decaps and 4-response to echo gets encapsulated [I do not get a full path to the source].
So my question is: why is my access list hitcnt = do not increment. If the return circulation (eho-answer) makes card encryption must be encapsulated so I guess the echo response proceeded by the ACL and I see the hitcnt ACL mount. I do not see at all or an increment.
I'm interpreting this incorrectly?
Thank you
Pete
NAT 0 access list will increment, in accordance with the following:
http://www.Cisco.com/en/us/docs/security/ASA/asa82/command/reference/no.html#wp1756533
(quoted by above the URL):
Note List of access hit counts, as evidenced by the show access-list command, do not increment the access lists NAT exemption. )
Crypto ACL will only increment on the first package when he tries to open the tunnel, all subsequent connection will not increment the number of accesses.
Here is the URL for your reference:
http://www.Cisco.com/en/us/docs/security/ASA/asa82/command/reference/C5.html#wp2238243
(quoted by above the URL):
Hit of the account increase access list only when the tunnel is initiated. Once the tunnel is up, the numbers of access does not increase on a stream by package).
Hope that answers your questions.
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VPN site to Site with restrictions (vpn-filter)
VPN site to site, I installed and it works fine and two site can meet but I question after the vpn enforcement - run under Group Policy
restrict users in the local site for dial-up networking with specific tcp ports, the vpn does not not like after order question «sh l2l vpn-sessiondb»
This works but users can't access something in the remote site
Note > after rising online in ACL at the end with this
US_SITE ip access list allow a whole
new to works well again
example of a line of Access-List
US_SITE list extended access permit tcp host 10.68.22.50 host 192.168.10.23 HTTP_HTTPS object-group
US_SITE list extended access permit tcp host 10.68.22.50 host 192.168.10.24 HTTP_HTTPS object-grouplocal network: 10.68.22.50
remote network: 192.168.10.24
is that correct or not?
attributes of the strategy group x.x.x.x
value of VPN-filer US_SITEtunnel-group General y.y.y.y
x.x.x.x by default-group-policyNote: allowed sysopt active vpn connection
The syntax on ACL that is used as a vpn-filter is different from what is normally expected. These VPN filters is not a direction, it should be noted the traffic we want to allow incoming and outgoing of the VPN in an ACL. The syntax for this is:
access-list X permit/deny REMOTE-DEFINITION LOCAL-DEFINITION
Example: You want to allow local users to access the RDP on the remote site:
access-list VPN-ACL permit tcp host 192.168.10.24 eq 3389 10.68.22.0 255.255.255.0
Disadvantage: This is all really confusing, and you can't afford things like Ping in one direction. -
ASA 5510 Auth for site-to-site VPN users
Hello
is there a way we can get the ASA to prompt users VPN site-to-site to authenticate on ASA/RADIUS before access resources head behind ASA such as Sharepoint etc allowed in via respective VPN ACL?
I never did, but you should be able to use authentication 'Cut Through'.
Basically, the user has little or no access, and the ASA intercepts a request, such as via HTTP and then authenticates the session. After that the user can access all that you allow them.
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Go simple configuration of vpn L2L comply with security requirements
Hello
I have successfully install a L2L connection (5510, 7.2) and a 3rd party (SonicWall).
Security requirements are such that (contractors) to our office users to connect to various devices to the 3rd party, BUT nothing to the 3rd party must connect to what be it at our office.
I tried an outbound ACL (access-group L2L-RESTRICT the interface inside) inside the interface. But the funny thing is that I'm getting hits on the declarations of refusal on the ACL, although tests show no problems for you connect to multiple hosts to our site of the 3rd party. My ACL config looks like the following:
<..snip..>
Note to L2L-RESTRICT access-list * ATTENTION * WITH CAUTION - RESTRICTIONS ON the 3rd PARTY VPN L2L
L2L-RESTRICT access-list scope allow icmp 192.168.16.0 255.255.255.0 10.180.21.0 255.255.255.0 echo-reply
deny access list L2L-RESTRICT the scope ip 192.168.16.0 255.255.255.0 no matter what newspaper
Note to L2L-RESTRICT access-list > NOTE< last="" line="" *must*="" be="" permit="" any="">
L2L-RESTRICT access-list scope ip allow a whole
!
L2L-RESTRICT the interface inside access-group
<..snip..>
Their network is obviously 192.168.16.x and they won't be able to use a vlan from different source as "interesting traffic" ACL won't allow it. So that sounds good in theory
I have it configured correctly? Is there a better way?
Thanks in advance,
Mike
Mike,
It seems that you might be able to assign a VPN ACL filter via a group assigned to each tunnel L2L policy. I have never done this personally before, but looks like it would work...
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cannot ping between remote vpn site?
vpn l2l site A, site B is extension vpn network, connect to the same vpn device 5510 to the central office and work well. I can ping from central office for two remote sites, but I cannot ping between these two vpn sites? Tried to debug icmp, I can see the icmp side did reach central office but then disappeared! do not send B next? Help, please...
permit same-security-traffic inter-interface
permit same-security-traffic intra-interface
!
object-group network SITE-a.
object-network 192.168.42.0 255.255.255.0
!
object-group network SITE-B
object-network 192.168.46.0 255.255.255.0
!
extended OUTSIDE allowed a whole icmp access list
HOLT-VPN-ACL extended access-list allow ip object-CBO-NET object group SITE-a.
!
destination SITE-a NAT (outside, outside) static source SITE - a static SITE to SITE-B-B
!
address for correspondence card crypto VPN-card 50 HOLT-VPN-ACL
card crypto VPN-card 50 peers set *. *.56.250
card crypto VPN-card 50 set transform-set AES-256-SHA ikev1
VPN-card interface card crypto outside
!
internal strategy group to DISTANCE-NETEXTENSION
Remote CONTROL-NETEXTENSION group policy attributes
value of DNS server *. *. *. *
VPN-idle-timeout no
Ikev1 VPN-tunnel-Protocol
Split-tunnel-policy tunnelspecified
Split-tunnel-network-list value REMOTE-NET2
value by default-field *.org
allow to NEM
!
remote access of type tunnel-group to DISTANCE-NETEXTENSION
Global DISTANCE-NETEXTENSION-attributes tunnel-group
authentication-server-group (inside) LOCAL
Group Policy - by default-remote CONTROL-NETEXTENSION
IPSec-attributes tunnel-group to DISTANCE-NETEXTENSION
IKEv1 pre-shared-key *.
tunnel-group *. *.56.250 type ipsec-l2l
tunnel-group *. *.56.250 ipsec-attributes
IKEv1 pre-shared-key *.
!!
ASA - 5510 # display route. include the 192.168.42
S 192.168.42.0 255.255.255.0 [1/0] via *. *. 80.1, outside
ASA - 5510 # display route. include the 192.168.46
S 192.168.46.0 255.255.255.0 [1/0] via *. *. 80.1, outside
ASA-5510.!
Username: Laporte-don't Index: 10
Assigned IP: 192.168.46.0 public IP address: *. *.65.201
Protocol: IKEv1 IPsecOverNatT
License: Another VPN
Encryption: 3DES hash: SHA1
TX Bytes: bytes 11667685 Rx: 1604235
Group Policy: Group remote CONTROL-NETEXTENSION Tunnel: remote CONTROL-NETEXTENSION
Opening time: 08:19:12 IS Thursday, February 12, 2015
Duration: 6 h: 53 m: 29 s
Inactivity: 0 h: 00 m: 00s
Result of the NAC: unknown
Map VLANS: VLAN n/a: no
!
ASA - 5510 # display l2l vpn-sessiondbSession type: LAN-to-LAN
Connection: *. *.56.250
Index: 6 IP Addr: *. *.56.250
Protocol: IPsec IKEv1
Encryption: AES256 3DES hash: SHA1
TX Bytes: bytes 2931026707 Rx: 256715895
Connect time: 02:00:41 GMT Thursday, February 12, 2015
Duration: 13: 00: 10:00Hi Rico,
You need dynamic nat (for available IP addresses) for the two side to every subset of remote access to the other side remote subnet and so they can access every other subnet as if both from the traffic from your central location.
example:
Say, this IP (10.10.10.254) is unused IP to the central office, allowed to access remote tunnel 'A' and 'B' of the site.
object-group network SITE-a.
object-network 192.168.42.0 255.255.255.0
!
object-group network SITE-B
object-network 192.168.46.0 255.255.255.0dynamic source destination SITE-a. 10.10.10.254 NAT (outdoors, outdoor)
public static SITE SITE-B-Bdestination NAT (outdoors, outdoor) SITE-B 10.10.10.254 dynamic source
SITE static-SITE aHope this helps
Thank you
Rizwan James
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VPN-filter seems to work in both directions
I have ASA 5520, Version 8.4 (3)
I set up VPN site to site vpn-filter for filtering of communications
I use this example:
VPN connection did not work, so I applied last line to my vpn-filter ACL:
access list acl-L2L-ORANGE extended deny ip any any interval notification log 60
I am very confused, because I heard syslog message:
% 5-ASA-106102: acl-L2L-ORANGE access list denied tcp to the user "
" inside/10.1.61.51(60748)-> outside/213.151.208.154(4490) It seems to me, this vpn filter filter my indoor to outdoor advertising.
Communication which is sent from inside the TUNNEL.
Worse still, my ACL include this line
access list acl-L2L-ORANGE line 1 scope permitted tcp 10.1.61.51 host 213.151.208.154 (hitcnt = 0)
How can it be possible?
Hello
If you want to get rid of the problems and complexity can be used access VPN filter lists you can run the following command
No vpn sysopt connection permit
It would make is that all connections from the remote site VPN L2L would be subject to check rule access-list on the external interface of your ASA in the same way your local network traffic heading for the remote site VPN L2L is checked by your inside of the access list interfaces
But if you go this route, you will need to consider that you will need to open the traffic for possible existing (Client and VPN L2L) VPN connections on your external interface to access list before running the above command.
At least in this way you encounter the problem that you actually more open that you expect with the type of VPN ACL filter. And as I said it is not quite as complicated to manage.
I must say however that I do not use the two ways depending on the environment that I am setting up.
-Jouni
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Unable to pass traffic between ASA Site to Site VPN Tunnel
Hello
I have problems passing traffic between two ASA firewall. The VPN tunnel is up with a dynamic IP and static IP address. I have attached a diagram of the VPN connection. I'm not sure where the problem lies and what to check next. I think I have all the roads and in the access lists are needed.
I've also attached the ASA5505 config and the ASA5510.
This is the first time that I've set up a VPN connection any guidance would be greatly appreciated.
Thank you
Adam
Hello
Regarding your opinion of configuration Remote Site ASA that you have not added the internal networks of the Central Site VPN L2L configurations at all so the traffic does not pass through the VPN.
access-list outside_1_cryptomap extended permit ip 10.1.1.0 255.255.255.128 10.182.226.0 255.255.*.* access-list exempt extended permit ip 10.1.1.0 255.255.255.128 10.182.226.0 255.255.*.* access-list exempt extended permit ip 10.1.1.0 255.255.255.128 10.182.0.0 255.255.*.* access-list exempt extended permit ip 10.1.1.0 255.255.255.128 192.168.170.0 255.255.*.* access-list exempt extended permit ip 10.1.1.0 255.255.255.128 192.168.172.0 255.255.*.* access-list exempt extended permit ip 10.1.1.0 255.255.255.128 140.15.0.0 255.255.*.*
Take a look at ACL configurations above. The 'exempt' ACL is used in configurations NAT0 and tells the ASA what traffic of exempting from NAT. "outside_1_cryptomap" ACL is used to tell the traffic between the subnets should be using the L2L VPN connection.
So in short on the Remote Site ASA these ACLs should be identical. Make additions to the LIST of VPN L2L, then try again.
I would also like to point out that to ensure that the Central ASAs L2L VPN ACL Site contains the same networks. The ACL on the Central Site will, of course, its internal subnets as the source and the site LAN remote destination.
THW out of ' crypto ipsec to show his " shows you that only the SA between binding Site Central network and the Remote Site LAN was established. Others have not formed as the configuration is lacking at LEAST on the Remote Site ASA. Can also be the Central Site.
-Jouni
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8.3 ASA VPN access rules
Hi, I recently bought an ASA 5520 to use as a VPN gateway for several tunnells site to site VPN. I've upgraded to version 8.3, and set up a lab environment. I implemented a simple VPN with a rule of intellectual property general permit to stert with and everything works fine. I'm having trouble tightenign access now, if I change the access on the SAA for ICMP I can ping both directions, if I add tcp I can telnet from a computer at the other end of the VPN, but if I change the tcp protocol to telnet, I can't connect. the other end on the VPN is a cisco 2620XM and I match the lists of access for each of the changes. I also do not understand the meaning of the ASA access list, it seems that if I want to allow the remote tcp host behind the ASA access I have the host behind the ASA as the source, it appears backward? Anyone can shed some light on this? very much appreciated.
Yes, you are supposed to only configure 'IP' to your ACL (ACL applied to your crypto card) crypto and crypto ACL supposed to mirror image on each peer, so when you change to specific TCP/UDP ports, is not mirror image of the other side/peer more.
I thought that you use ACL applied to "vpn-filter".
But in the previous post, actually configure you ACL on each interface.
The above is 3 different ACL you have applied differently (crypto ACL--> apply to the card crypto, vpn ACL--> apply to vpn-filter and your normal ACL interface).
Maybe you are looking for
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