IPSEC and SSH2

Does anyone know if the switch Cisco 3750 G supports IPSEC and SSH2?

Mohsen

Yep, that's what I would do as well.

I'm happy to have helped.

Jon

Tags: Cisco Security

Similar Questions

L2TP/IPSec and VRRP on Cisco VPN3000

Hello. I don't know if this is the right forum, please excuse me if this is not (of course a pointer to the right we'd appreciate it :)

I'm experimenting with the implementation of VPN 3000 Concentrator series VRRP, and it seems that when the unit of "backup" takes over, no L2TP/IPsec tunnel can be established more.

When the switch takes place, the backup device takes over VRRP group IP addresses, which are the IP address of the master own as well on VPN 3000. Thus, the backup unit manages two different IP addresses, its own ad group.

Well, what I observed using a sniffer is that while the IKE/IPSec packets come well to the group address, L2TP packets are by IP address of the backup device physical and clear instead of be encapsulated in IPSec travel packages. The client computer (PC Windows 2000) clearly ignores the L2TP packets and no L2TP/Ipsec tunnel can be established. PPTP tunnels work, however.

The foregoing does not occur when the VPN 3000 master works, like the VRRP group addresses are the same as its own interface addresses.

Now, VPN 3000 documentation or TAC documents explicitly say that L2TP/IPSec and VRRP are incompatible, but they do not mention compatibility as well (although they do mention the VRRP Protocol PPTP compatibility).

Did someone better informed than me? Is there a technical reason for the incompatibility between L2TP with VRRP, or it's a bug any?

Thank you

Roberto Patriarca

This has proved quite recently and a high severity bug has been open about it and is currently under review.

See http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCeb77328&Submit=Search for more details.

Nice work well in the survey.

Windows IPSEC and SSL VPN client on the same machine

Matches (coexistence) installation of IPSEC and SSL vpn clients that are supported on the same computer, windows (XP and Win7)?

As mentioned by Patricia and Jennifer (5 stars), you can install two clients on the same machine without any problem.

The tricky part comes when you are trying to connect two clients at the same time, that's when you may encounter unexpected problems.

However, if your intention is to install both clients and connect them individually and not at the same time, you'll be fine.

If you have any other questions, please mark this question as answered and note all messages that you have found useful.

Thank you.

Portu.

Post edited by: Javier Portuguez

Cisco ASA Site to Site VPN IPSEC and NAT question

Hi people,

I have a question about the two Site to Site VPN IPSEC and NAT. basically what I want to achieve is to do the following:

ASA2 is at HQ and ASA1 is a remote site. I have no problem setting a static static is a Site to IPSEC VPN between sites. Guests residing in 10.1.0.0/16 are able to communicate with hosts in 192.168.1.0/24, but what I want is to configure the NAT with IPSEC VPN for this host to 10.1.0.0/16 will communicate with hosts in 192.168.1.0/24 with translated addresses

Just an example:

N2 host (10.1.0.1/16) contacted N1 192.168.1.5 with destination host say 10.23.1.5 No 192.168.1.5 (notice the last byte is the same in the present case,.5)

The translation still for the rest of the communication (host pings ip destination host 10.23.1.6 N3 N2 not 192.168.1.6 new last byte is the same)

It sounds a bit confusing to me, but I've seen this type of configuration before when I worked for the supplier of managed services where we have given our customers (Ipsec Site to Site VPN with NAT, don't know how it was setup)

Basically we contact the customer via site-to-site VPN hosts but their real address were hidden and we used as translated address more high 10.23.1.0/24 instead of (real) 192.168.1.0/24, last byte must be the same.

Grateful if someone can shed some light on this subject.

Hello

OK so went with the old format of NAT configuration

It seems to me that you could do the following:
- Configure the ASA1 with static NAT strategy
  - access-list L2LVPN-POLICYNAT allowed ip 192.168.1.0 255.255.255.0 10.1.0.0 255.255.0.0
  - public static 10.23.1.0 (inside, outside) access-list L2LVPN-POLICYNAT
- Because the above is a static NAT of the policy, this means that the translation will be made only when the destination network is 10.1.0.0/16
- If you have for example a PAT basic configuration to inside-> external traffic, the above NAT configuration and the custom of the actual configuration of PAT interfere with eachother
- ASA2 side, you can normally configure NAT0 / NAT Exemption for the 10.1.0.0/16 network
  - Note of the INTERIOR-SHEEP access-list SHEEP L2LVPN
  - the permitted INSIDE SHEEP 10.1.0.0 ip access list 255.255.0.0 10.23.1.0 255.255.255.0
  - NAT (inside) 0-list of access to the INTERIOR-SHEEP
- You will need to consider that your access-list defining the VPN encrypted L2L traffic must reflect the new NAT network
  - ASA1: allowed to access-list L2LVPN-ENCRYPTIONDOMAIN ip 10.23.1.0 255.255.255.0 10.1.0.0 255.255.0.0
  - ASA2: list L2LVPN-ENCRYPTIONDOMAIN allowed ip 10.1.0.0 access 255.255.0.0 10.23.1.0 255.255.255.0
I could test this configuration to work tomorrow but I would like to know if it works.

Please rate if this was helpful

-Jouni

Press L2L VPN, IPSEC, and L2TP PIX connections

Hi all

I'm trying to implement a solution on my FW PIX (pix804 - 24.bin) to be able to support a VPN L2L session with VPN dynamic user sessions where clients will use a mix of IPSEC(Nat detection) and L2TP. We have always supported things IPSEC and that worked great for many years. I'm now trying to Add L2TP support, so that I can support Android phones/ipads, etc. as well as Windows with built in VPN l2tp clients clients. Everything works well except for the new features of L2TP. Allows you to complete one phase but then tries to use the card encryption that is used for the VPN L2L. It seems to fail because IP addresses are not in the configured ACL to the crypto-map L2L. Does anyone know if there are any questions all these configurations support both. And if not can you see what I have wrong here, which would make it not work. Here are the relevant training:

C515 - A # sh run crypto
Crypto ipsec transform-set esp-SHA-ESP-3DES-3des esp-sha-hmac
Crypto ipsec transform-set ESP-3DES-MD5-esp-3des esp-md5-hmac
Crypto ipsec transform-set of society-ras-esp-3des esp-md5-hmac
Crypto ipsec transform-set ESP-DES-MD5 esp - esp-md5-hmac
Crypto ipsec transform-set esp-3des esp-sha-hmac company-l2tp
life crypto ipsec security association seconds 28800
Crypto ipsec kilobytes of life - safety 4608000 association
Dynamic crypto map company-ras 1 correspondence address company-dynamic
company Dynamics-card crypto-ras 1 set pfs
Dynamic crypto map company-ras 1 transform-set ESP-SHA-3DES ESP-3DES-MD5 company-ras
Dynamic crypto map company-ras 1 lifetime of security association set seconds 28800
company Dynamics-card crypto-ras 1 kilobytes of life together - the association of safety 4608000
crypto dynamic-map-ras company 2 address company-dynamic game
crypto dynamic-map company-ras 2 transform-set of society-l2tp
crypto dynamic-map company-ras 2 set security association lifetime seconds 28800
company Dynamics-card crypto-ras 2 kilobytes of life together - the association of safety 4608000
card crypto company-map 1 correspondence address company-colo
card crypto company-card 1 set pfs
card crypto company-card 1 set counterpart colo-pix-ext
card crypto card company 1 value transform-set ESP-3DES-MD5 SHA-ESP-3DES
company-map 1 lifetime of security association set seconds 28800 crypto
card company-card 1 set security-association life crypto kilobytes 4608000
company-card 1 set nat-t-disable crypto card
company-card 2 card crypto ipsec-isakmp dynamic company-ras
business-card interface card crypto outside
crypto isakmp identity address
crypto ISAKMP allow outside

Crypto isakmp nat-traversal 3600

crypto ISAKMP policy 1
preshared authentication
3des encryption
sha hash
Group 2
life 86400
crypto ISAKMP policy 2
preshared authentication
3des encryption
md5 hash
Group 2
life 86400
C515 - A # sh run tunnel-group
attributes global-tunnel-group DefaultRAGroup
company-ras address pool
Group-LOCAL radius authentication server
Group Policy - by default-l2tp
IPSec-attributes tunnel-group DefaultRAGroup
pre-shared-key *.
tunnel-group DefaultRAGroup ppp-attributes
PAP Authentication
No chap authentication
ms-chap-v2 authentication
eap-proxy authentication
type tunnel-group company-ras remote access
tunnel-group global company-ras-attributes
company-ras address pool
Group-LOCAL radius authentication server
tunnel-group company-ras ipsec-attributes
pre-shared-key *.
type tunnel-group company-admin remote access
attributes global-tunnel-group company-admin
company-admin address pool
Group-LOCAL radius authentication server
company strategy-group-by default-admin
IPSec-attributes of tunnel-group company-admin
pre-shared-key *.
PPP-attributes of tunnel-group company-admin
No chap authentication
ms-chap-v2 authentication
tunnel-group x.x.x.x type ipsec-l2l
tunnel-group ipsec-attributes x.x.x.x
pre-shared-key *.
ISAKMP keepalive retry threshold 15 10
C515 - A # sh run Group Policy
attributes of Group Policy DfltGrpPolicy
Server DNS 10.10.10.20 value 10.10.10.21
Protocol-tunnel-VPN IPSec
enable PFS
Split-tunnel-policy tunnelspecified
Split-tunnel-network-list value company-SPLIT-TUNNEL-ACL
company.int value by default-field
NAC-parameters DfltGrpPolicy-NAC-framework-create value
internal strategy of company-admin group
attributes of the strategy of company-admin group
WINS server no
DHCP-network-scope no
VPN-access-hour no
VPN - 20 simultaneous connections
VPN-idle-timeout 30
VPN-session-timeout no
Protocol-tunnel-VPN IPSec l2tp ipsec
disable the IP-comp
Re-xauth disable
Group-lock no
enable PFS
Split-tunnel-network-list value company-ADMIN-SPLIT-TUNNEL-ACL
L2TP strategy of Group internal
Group l2tp policy attributes
Server DNS 10.10.10.20 value 10.10.10.21
Protocol-tunnel-VPN l2tp ipsec
disable the PFS
Split-tunnel-policy tunnelall
company.int value by default-field
NAC-parameters DfltGrpPolicy-NAC-framework-create value

Relevant debug output

C515 - Has # Sep 03 02:09:33 [IKEv1 DEBUG]: IP = 66.25.14.195, Oakley proposal is acceptable
Sep 03 02:09:33 [IKEv1 DEBUG]: IP = 66.25.14.195, IKE Peer included IKE fragmentation capability flags: Main Mode: real aggressive Mode: false
Sep 03 02:09:33 [IKEv1 DEBUG]: IP = 66.25.14.195, IKE SA proposal # 1, turn # 1 entry IKE acceptable Matches # 3 overall
Sep 03 02:09:33 [IKEv1]: IP = 66.25.14.195, connection landed on tunnel_group DefaultRAGroup
Sep 03 02:09:33 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, status of automatic NAT detection: remote endpoint IS behind a NAT device this end is NOT behind a NAT device
Sep 03 02:09:33 [IKEv1]: IP = 66.25.14.195, connection landed on tunnel_group DefaultRAGroup
Sep 03 02:09:33 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, previously allocated memory of liberation for permission-dn-attributes
Sep 03 02:09:33 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, PHASE 1 COMPLETED
Sep 03 02:09:33 [IKEv1]: IP = 66.25.14.195, for this connection Keep-alive type: None
Sep 03 02:09:33 [IKEv1]: IP = 66.25.14.195, Keep-alives configured on, but the peer does not support persistent (type = None)
Sep 03 02:09:33 [IKEv1 DEBUG]: Group = DefaultRAGroup, IP = 66.25.14.195, timer to generate a new key to start P1: 21600 seconds.
Sep 03 02:09:33 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, data received in payload ID remote Proxy Host: address 172.16.0.104 17 of the Protocol, Port 0
Sep 03 02:09:33 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, data received in payload ID local Proxy Host: address x.x.x.x, 17 of the Protocol, Port 1701
Sep 03 02:09:33 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, detected L2TP/IPSec session.
Sep 03 02:09:33 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, QM IsRekeyed its not found old addr
Sep 03 02:09:33 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, static check card Crypto, check card company card, seq = 1 =...
Sep 03 02:09:33 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, static check card Crypto card = company-map, seq = 1, ACL does not proxy IDs src:66.25.14.195 dst: x.x.x.x
Sep 03 02:09:33 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, tunnel IPSec rejecting: no entry for crypto for proxy card proxy remote 66.25.14.195/255.255.255.255/17/0 local x.x.x.x/255.255.255.255/17/1701 on the outside interface
Sep 03 02:09:33 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, error QM WSF (P2 struct & 0x501c1f0, mess id 0xa181b866).
Sep 03 02:09:33 [IKEv1 DEBUG]: Group = DefaultRAGroup, IP = 66.25.14.195, case of mistaken IKE responder QM WSF (struct & 0x501c1f0) , : QM_DONE EV_ERROR--> QM_BLD_MSG2 EV_NEGO_SA--> QM_BLD_MSG2, EV_IS_REKEY--> QM_BLD_MSG2, EV_CONFIRM_SA--> QM_BLD_MSG2, EV_PROC_MSG--> QM_BLD_MSG2, EV_HASH_OK--> QM_BLD_MSG2, NullEvent--> QM_BLD_MSG2, EV_COMP_HASH
Sep 03 02:09:33 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, peer table correlator Removing failed, no match!
Sep 03 02:09:33 [IKEv1]: ignoring msg SA brand with Iddm 204910592 dead because ITS removal
Sep 03 02:10:05 [IKEv1 DEBUG]: IP = 66.25.14.195, Oakley proposal is acceptable
Sep 03 02:10:05 [IKEv1 DEBUG]: IP = 66.25.14.195, IKE Peer included IKE fragmentation capability flags: Main Mode: real aggressive Mode: false
Sep 03 02:10:05 [IKEv1 DEBUG]: IP = 66.25.14.195, IKE SA proposal # 1, turn # 1 entry IKE acceptable Matches # 3 overall
Sep 03 02:10:05 [IKEv1]: IP = 66.25.14.195, connection landed on tunnel_group DefaultRAGroup
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, status of automatic NAT detection: remote endpoint IS behind a NAT device this end is NOT behind a NAT device
Sep 03 02:10:05 [IKEv1]: IP = 66.25.14.195, connection landed on tunnel_group DefaultRAGroup
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, previously allocated memory of liberation for permission-dn-attributes
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, PHASE 1 COMPLETED
Sep 03 02:10:05 [IKEv1]: IP = 66.25.14.195, for this connection Keep-alive type: None
Sep 03 02:10:05 [IKEv1]: IP = 66.25.14.195, Keep-alives configured on, but the peer does not support persistent (type = None)
Sep 03 02:10:05 [IKEv1 DEBUG]: Group = DefaultRAGroup, IP = 66.25.14.195, timer to generate a new key to start P1: 21600 seconds.
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, data received in payload ID remote Proxy Host: address 172.16.0.104 17 of the Protocol, Port 0
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, data received in payload ID local Proxy Host: address x.x.x.x, 17 of the Protocol, Port 1701
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, detected L2TP/IPSec session.
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, QM IsRekeyed its not found old addr
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, static check card Crypto, check card company card, seq = 1 =...
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, static check card Crypto card = company-map, seq = 1, ACL does not proxy IDs src:66.25.14.195 dst: x.x.x.x
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, tunnel IPSec rejecting: no entry for crypto for proxy card proxy remote 66.25.14.195/255.255.255.255/17/0 local x.x.x.x/255.255.255.255/17/1701 on the outside interface
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, error QM WSF (P2 struct & 0x501c1f0, mess id 0xa5db9562).
Sep 03 02:10:05 [IKEv1 DEBUG]: Group = DefaultRAGroup, IP = 66.25.14.195, case of mistaken IKE responder QM WSF (struct & 0x501c1f0) , : QM_DONE EV_ERROR--> QM_BLD_MSG2 EV_NEGO_SA--> QM_BLD_MSG2, EV_IS_REKEY--> QM_BLD_MSG2, EV_CONFIRM_SA--> QM_BLD_MSG2, EV_PROC_MSG--> QM_BLD_MSG2, EV_HASH_OK--> QM_BLD_MSG2, NullEvent--> QM_BLD_MSG2, EV_COMP_HASH
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, peer table correlator Removing failed, no match!
Sep 03 02:10:05 [IKEv1]: ignoring msg SA brand with Iddm 204914688 dead because ITS removal

The outputs of two debugging who worry are the following:

Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, data received in payload ID remote Proxy Host: address 172.16.0.104 17 of the Protocol, Port 0
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, data received in payload ID local Proxy Host: address x.x.x.x, 17 of the Protocol, Port 1701

Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, static check card Crypto, check card company card, seq = 1 =...
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, static check card Crypto card = company-map, seq = 1, ACL does not proxy IDs src:66.25.14.195 dst: x.x.x.x
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, tunnel IPSec rejecting: no entry for crypto for proxy card proxy remote 66.25.14.195/255.255.255.255/17/0 local x.x.x.x/255.255.255.255/17/1701 on the outside interface
Sep 03 02:10:05 [IKEv1]: Group = DefaultRAGroup, IP = 66.25.14.195, error QM WSF (P2 struct & 0x501c1f0, mess id 0xa5db9562).

This seems to indicate that his NAT detection but then do not assign to the entry card cryptography because networks are encrypted are not in the configured ACL that is true. He needs to use dynamic input and it doesn't seem to be.

I need to create another dynamic map entry to make it work instead of add lines to the same dynamic with a lower (higher) priority map entry?

Thanks in advance for any help here.

Hello

That won't do the trick, l2tp clients are picky kindda, so you know if they do not hit the correct strategy first they just stop trying. Follow these steps:

correspondence from the company of dynamic-map crypto-ras 1 address company-dynamic

No crypto-card set pfs dynamic company-ras 1

No crypto dynamic-map company-ras-1 transform-set ESP-SHA-3DES ESP-3DES-MD5 company-ras

Dynamic crypto map company-ras 1 transform-set company-l2tp SHA-ESP-3DES ESP-3DES-MD5 company-ras

The foregoing will not affect existing customers of IPsec at all, these clients will not use the statement of pfs and will link even if the correspondence address is not configured (it is optional), besides Cisco IPsec clients will be affected first the mode of transport policy and fail however they will continue to try and hit another police PH2.

Regarding your last question, I was referring specifically to the support of l2tp for android, and Yes, you will need to run one of these versions.

http://www.Cisco.com/en/us/docs/security/ASA/asa82/release/notes/asarn82.html#wp431562

Tavo-

Tunnels of router that support s multiple VPN IPsec AND SSL VPN

I have a main office and an office, each with a RVL200 connected via the IPSec VPN tunnel. We grow faster than we thought and add 2 more branches. Is there a router that is similar to the RVL200 can I put in my main office in support of multiple IPSec tunnels connected to RVL200 in branches, but also keep the SSL VPN?

It seems that the Cisco ASA 5505 will do.

VRF aware IPSEC and NAT

Hello world.

I ' am having a Hub router and 2 routers Spoke with LAN - IP - address range overlap.

->-10.47.1.0/24 routerA

/

172.16.1.0 - VRFR

\

-> RouterB-10.47.1.0/24

I use road maps to get the different local host for the VRF different side of the hub (no problem)

I use the VRF aware IPSEC functionality to get to the different networks - talk without nat (no problem)

My main question is that I have to do nat on the router HUB - I need to translate the host on the HUB - local LAN IP-addresses defined by the different LAN talk Administraors.

These NAT-ranges may be different / might overlap for the different VRF.

My problem is that I have no idea how to do to get NAT traffic ' ed correctly (after the road-map, before IPSEC).

If you have an idea / if you solved the problem

-I would be grateful for a hint of /Clue / THE Solution.

Thanks in advance

Jarle

Hi Nelly,

I finally found a router to test on it. I'm still trying to make it work with a single site without NAT. Without success so far, the card encryption is not triggered.

Question: what this line do exactly? IP route vrf VRF1 10.47.2.0 255.255.255.0 200.200.200.1 global

I guess that's only in the anticipation of your originating stuff.

In a NAT environment, no, do you still need an ip route vrf command?

What is the result of your sh ip vrf interface?

Is this ok for the vrf to be associated only to the loopback interface?

No clue on how to solve this?

Regarding your last comment, your crypto card should be ok. Packets are translated before being treated by the encryption engine. See the link

http://www.Cisco.com/warp/public/556/5.html

I would try

interface Ethernet0/0

IP nat inside

interface Ethernet1/0

NAT outside IP

IP nat inside source static network 10.47.1.0 10.47.2.0/24 VRF1 vrf

Thank you

Michel

IPSec and packet loss: Question

Hello, hopefully a simple Question :-)

Can someone tell me what happens when an IPSec packet is lost.

He get fired?

are just the TCP packets inside IPSec resentment tunnel?

I hope someone can help!

Background: VoIP.

We have Home office users.

Some have a quality of voice some terrible have a perfect quality, even if they all use the same hardware and configurations (name of user/passwords different and IP addresses of course)

Fraser

There isn't anything in IPSec that would retransmit a lost package. It is the native protocol and terminal stations that communicate in order to determine if there is packet loss and whether or not to broadcast.

If I understand your comment correctly that you are dealing with individual users do VOIP, then more things you mention, which is different (name of user and password and addresses) almost certainly dealing with various different service providers / Internet connectivity. It would be interesting to do a ping extended with a large number of ping packets to a user who experiences problems and one that does not. I suspect that you will see a significant difference in packet loss.

HTH

Rick

PIX IPSec and ACL issues

Hello

On a PIX 515E v.6.3.5.

There are three lists ACL that can come into play when setting up an IPSec VPN on a PIX? (I hear a sound of 'It depends')

1 Nat (0) ACL - NOT NAT traffic, it is part of the IPSec VPN

2 crypto ACL - ACL that distinguishes if the traffic is destined for the IPSec tunnel.

3 ACL - ACL to allow | deny traffic after ACL #1 and #2.

#3 "Allow packet IPSec to bypass the blocking of access list" If the "ipsec sysopt connection permit" command is configured and ONLY for the #3 ACL? In other words the sysopt does not participate on ACL #1 or 2 above?

The mirroring of the ACL, which is suggested (required) to both sides of the tunnel IPSec applies to what ACL?

Thank you

Dan
```
pdvcisco wrote:
Hello,
On a PIX 515E v.6.3.5.
Are there three ACL lists that can come in to play when configuring an IPSec VPN on a PIX? (I hear a roar of "It depends" )
1. Nat (0) ACL  - to NOT nat traffic this is part of the IPSec VPN
2. Crypto ACL - ACL that distinguishes if the traffic is destined for the IPSec tunnel.
3. ACL - ACL to permit | deny traffic after ACL #1 and #2.
Does #3 "enable IPSec packets to bypass access list blocking" if the "sysopt connection permit-ipsec" command is configured, and ONLY on ACL #3? In other words the sysopt doesn't participate on ACL #1 or 2 listed above?
The mirroring of ACL's, that is suggested (required) for both sides of the IPSec tunnel applies to which ACL?
Thanks,
Dan
```
Dan

It depends on

(1) is not always used, because with a site to site VPN sometimes you need to NAT your addressing internal

(2) always necessary

(3) if the "ipsec sysopt connection permit" is set up any ACLs on the interface where the VPN is finished is bypassed. If it is not enabled then once packets are decrypted they are then checked against the acl.

Mirrored ACLs is required.

Jon

VPN ipsec and port 500

Hello world

I connected connection VPN IPSEC.

Connection works fine.

Here's the Setup program

PC---R1---R2--R3---ISP---ASA

I check on R3

The R3 CBAC is configured.

R3 # sh ip inspect sessions | 96.51.x.x Inc.
65719DB4 (192.168.98.6:59936)-online (96.51.x.x:4500) SIS_OPEN udp session

What vpn ipsec connection is established, it shows that it is plugged into the port 4500 not 500?

What is default behavior?

Initially when he formed theVPN connection it showed both udp, ports 500 and 4500.

Concerning

MAhesh

It has NAT/PAT between R3 and ASA. like address (192.168.98.6) private IP allows you to configure the ipsec session. IKE detects NAT/PAT exist in NAT - D payload. IKE uses UDP 4500 to negotiate ISAKMP rather than UDP 500. Subsequently, the ESP traffic is also encapsulated in UDP 4500, in this way it can cross the NAT/PAT safely.

If this behavior is expected.

Conflict of IPSec between IPSec and business VPN tunnels

I crushed a 2821 current c2800nm-adventerprisek9 - mz.124 - 22.YB8 at home with 2 gre IPSec tunnels for personal use, and my office will be held that a customer based IPSec VPN to connect to the corporate VPN. My problem is that when I want to connect to the corporate VPN, I see packages being encrypted and sent, but I would have never received the return packets. It seems that the IPSec VPN tunnels with IPSec from my office and router packages conflict trying to decrypt and gives this error. (I removed the public addresses for anonymity)

CRYPTO-4-RECVD_PKT_INV_SPI: decaps: rec would be package IPSEC a bad spi to destaddr = "myaddress", prot = 50, spi = 0xDB32344E (3677500494), port = "corpvpn".

When I remove the card encryption off-side WAN router, my Office VPN works immediately. I can change the configuration, either on the side of the IPSec GRE tunnels, but has no way for me to change any configuration on the corporate VPN. Does anyone know of a workaround on the cisco router? I can provide the running configs or view orders.

The 2821 also performs NAT overload for internet access.

Hello, Reed.

1. try to remove the interface crypto map and add "protection... profile ipsec tunnel." "to your VTI:

Crypto ipsec IPSEC profile

solid Set trans

int g0/0

No crypto map card

int tu1

Ipsec IPSEC protection tunnel profile

int tu2

Ipsec IPSEC protection tunnel profile

2. try to force your corpVPN to use encapsulation UDP instead of ESP.

IPSEC and NAT

I have a client that uses NAT to connect to the web. He wants to connect to a server on the web using IPSEC. This server has a static NAT entry.

I fear that, due to the NAT process sitting between the hosts that the IPSEC tunnel will not work.

Please notify.

Assuming you are using ESP encapsulation, static NAT should work. PAT will have problems and encapsulation AH will not work. You will also need to open a conduit for incoming ESP and IKE (UDP 500) on the firewall.

IPSec and used keys

Hello world.

When you use ipsec (AH / ESP), authentication and encryption requires a secret key as dicussed in the following snippet:

Authentication allows you to calculate a value (ICV) integrity checking on the contents of the package, and it is usually based on a cryptographic like MD5 or SHA-1 hash. It incorporates a secret key known to both ends and this allows the recipient value ICV in the same way. If the beneficiary Gets the same value, the sender has actually authenticated itself (relying on the property that the cryptographic hashes cannot practically be reversed). AH still provides authentication and ESP to do eventually.

The encryption uses a secret key to encrypt data before transmission, and this mask the actual content of the package of eavesdroppers. There is a certain choice of algorithms here, with DES, 3DES, Blowfish and AES are quite common. Others are also possible.

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

These keys can be configured manually, or they can be exchanged by IKE as dicussed in the following snippet:

From the manuals key IKE

Since both sides of the conversation need to know the secret values used in hash or encryption, there is the question of just how these data are exchanged. The manual keys require manual entry of the secret values at both ends, probably transmitted by an out-of-band mechanism, and IKE (Internet Key Exchange) is a sophisticated mechanism to do this online.

========================================================

When I look at the giiven examples in response to my last thread on the vpn, I don't see these sectet required for authentication keys and encrption pf packages. ;

Here is an example:

crypto ISAKMP policy 10

preshared authentication

address key crypto isakmp 199.199.199.2 CISCO

!

Crypto ipsec transform-set esp-3des esp-sha-hmac MyTransSet

transport mode

!

Profile of crypto ipsec MyProfile

game of transformation-MyTransSet

!

interface Tunnel0

IP 10.10.10.1 255.255.255.252

tunnel source 199.199.199.1

tunnel destination 199.199.199.2

ipv4 ipsec tunnel mode

Profile of tunnel MyProfile ipsec protection

!

interface serial0

199.199.199.1 IP address 255.255.255.0

automatic duplex

automatic speed

!

IP route 0.0.0.0 0.0.0.0 199.199.199.2

Above that the keys are used for authentication and encrption of packages?

Thanks and a great weekend.

As written in your quote, Ike negotiates these keys for you. Since you are using Ike, you don't have to manually configure the encryption keys in a block.

Sent by Cisco Support technique iPad App

IPSEC and Protection Tunnel

Network diagram

Config of branch

IOS Version

(C2801-ADVIPSERVICESK9-M), Version 12.4(15)T7,

Physical Interface

interface Vlan220

ip address 10.152.1.202 255.255.255.252

no ip redirects

no ip unreachables

no ip proxy-arp

no ip route-cache cef

no ip route-cache

Tunnel connecting to **

interface Tunnel220

ip address 192.168.220.5 255.255.255.0

no ip redirects

no ip unreachables

no ip proxy-arp

ip mtu 1430

ip nhrp authentication dmvpn243

ip nhrp map multicast 10.16.101.1

ip nhrp map 192.168.220.1 10.16.101.1

ip nhrp network-id 243

ip nhrp holdtime 3600

ip nhrp nhs 192.168.220.1

no ip route-cache cef

no ip route-cache

ip tcp adjust-mss 1330

ip ospf network point-to-multipoint

ip ospf cost 10

ip ospf hello-interval 10

ip ospf priority 0

ip ospf mtu-ignore

tunnel source Vlan220

tunnel mode gre multipoint

tunnel key 243

tunnel protection ipsec profile dmvpn-profile

end

Tunnel Connecting to DR

interface Tunnel230

ip address 192.168.230.1 255.255.255.0

no ip redirects

ip mtu 1400

ip nhrp authentication dmvpn230

ip nhrp map 192.168.230.254 10.15.101.1

ip nhrp map multicast 10.15.101.1

ip nhrp network-id 230

ip nhrp holdtime 3600

ip nhrp nhs 192.168.230.254

tunnel source Vlan220

tunnel mode gre multipoint

tunnel key 230

tunnel protection ipsec profile dr

Problem

See the output of crypto ipsec (omitted)

Crypto map tag: Tunnel220-head-0, local addr 10.152.1.202
protected vrf: (none)
local  ident (addr/mask/prot/port): (10.152.1.202/255.255.255.255/47/0)
remote ident (addr/mask/prot/port): (10.15.101.1/255.255.255.255/47/0)
local  ident (addr/mask/prot/port): (10.152.1.202/255.255.255.255/47/0)
remote ident (addr/mask/prot/port): (10.16.101.1/255.255.255.255/47/0)
    Crypto map tag: Tunnel230-head-0, local addr 10.152.1.202
protected vrf: (none)
local  ident (addr/mask/prot/port): (10.152.1.202/255.255.255.255/47/0)
remote ident (addr/mask/prot/port): (10.15.101.1/255.255.255.255/47/0)

I make a connection to the Dominican Republic (10.15.101.1) and tunnel comes however, there are a few problems with IPSEC. When I remove tunnel protection beginning of things work properly and I can receive responses of ping from both ends which means PNDH / config DMVPN is perfect. The problem with IPSEC (phase 2), it's that I want to connect 10.15.101.1 (DR) and branch (10.152.1.202).

When I check crypto ipsec to show his I see duplicate proxy identity i.e. 10.152.1.202 - 10.15.101.1 tunnel (shown above in quotation) 220 and again in tunnel of 230. Very well to make things work it should only appear in the config of Tunnel 230. When I stop 220 tunnel proxy identity goes far from 220 and only the left one is taken from Tunnel 230 (the right one) after he starts to work properly, but when the two tunnels are entered again duplicate would come to the top and the other end (tunnel), which is the 192.168.230.x acquired through 10.15.101.1, I can not ping.

Would it be because of the bug in the IOS? Note that in above config (220 tunnel that points to *) I put ip PNDH card 192.168.220.1 10.16.101.1 which means that I would receive from only in crypto ipsec (for tunnel 220) connection to 10.16.101.1 and not 10.15.101.1.

Hmmmm, phase 1 DMVPN (which uses a point next to speak) does not require not shared ;-)

It's the only multipoint interface problem.

Happy WLL in any case, it has worked.

ASA5505: Configure the ASA for IPSec and SSL VPN?

Hello-

I currently have my 5505 for SSL AnyConnect VPN connections Setup. Is it possible to set up also the 5505 for IPSec VPN connections?

So, basically my ASA will be able to perform SSL and IPSec VPN tunnels, at the same time.

Thank you!

Kim,

Yes, you can configure your ASA to support the AnyConnect VPN IPSec connections and at the same time. In short, for the configuration of IPSec, you should configure at least a strategy ISAKMP, a set of IPSEC, encryption, tunnel group card processing and associated group policy.

Matt

IPSEC and SSH2

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