topic Re: ASA Context running in parallel with ASA-VPN in Network Security

ASA Context running in parallel with ASA-VPN

natedog — Mon, 11 Mar 2019 11:13:37 GMT

The scenario I have is an ASA in context mode and I am looking to terminate VPN clients on a seperate ASA that has an interface on the same private subnet. I have added a route to the ASA context for the VPN pool that belongs to the VPN-ASA. i can ping the vpn clients from the ASA context but I cannot establish any connection from the VPN client I get the following message

04:21:21 106001 192.168.41.215 10.50.1.1 Inbound TCP connection denied from 192.168.41.215/23 to 10.50.1.1/52412 flags SYN ACK on interface inside

Any ideas? Thanks.

Re: ASA Context running in parallel with ASA-VPN

santukumar — Mon, 24 Sep 2007 10:44:32 GMT

U have not cleared that u r talking about multiple mode.can u ping from outside to inside, if yes, then check ur vpn config i.e. check with this command---

show isakmp sa

show ipsec sa

And then see that vpn has been created or not.

Re: ASA Context running in parallel with ASA-VPN

natedog — Thu, 27 Sep 2007 19:18:41 GMT

yes I am running one ASA in multiple context mode. The other ASA is running parallel in single context mode. The vpn terminates fine and I can ping the ipsec clients as they connect from the ASA that's running in multiple context mode. However if a vpn user tried to access internal resources its failing. This is the error I am getting which is related to translation problems.

192.168.41.20 10.50.1.1 Inbound TCP connection denied from 192.168.41.20/23 to 10.50.1.1/2103 flags SYN ACK on interface inside

Re: ASA Context running in parallel with ASA-VPN

umamytov — Sat, 29 Sep 2007 02:16:19 GMT

It appears packet from server (SYN ACK from port 23 is certainly a server packet) to client is getting dropped. Since you said two ASAs are sitting in parallel can you clarify which ASA dropping the packet ? If it's multi context one then it appears routing needs to be fixed such that packets destined to VPN client IPs go to VPN-ASA. I would guess you have a L3 box on inside segment that routes to ASAs depending on destination. It may be that L3 box is routing VPN client IPs to multi-ASA instead of VPN-ASA.

Re: ASA Context running in parallel with ASA-VPN

natedog — Sat, 29 Sep 2007 12:51:45 GMT

Right now I am not using any layer 3 box, i was hoping to avoid that and just have the multi-contxt ASA send packets over to the ASA-VPN device when they needed route out.

I have tried utilizing the NO_NAT rules on both the VPN-ASA and context ASA but since the traffic is never leaving the inside interface of the context ASA then that doesnt make any sense.

Am I going to need a layer 3 box to handle this?