[c-nsp] Allowing VPN clients to access L2L tunnels terminating on the same outside interface

[Ge Moua]

What about setting up some GRE tunnels to route the traffic of interest 
over to the other L2L sites.  I've seen configs for this on Cisco CCO.

Regards,
Ge Moua | Email: moua0100 at umn.edu

Network Design Engineer
University of Minnesota | Networking & Telecommunications Services

Aaron Riemer wrote:
> Hey guys,
>  
> I am hoping someone out there has configured something similar as I am
> having a lot of grief getting this working.
>  
> Essentially what we are trying to do is to allow our VPN clients to
> access other L2L sites that terminate on the same outside interface. See
> below for details.
>  
> VPN Client address range 10.100.1.100-200/24
> VPN client default gateway 10.100.1.1/24 (Inside 3750 switch next hop
> after ASA)
> ASA Inside address 10.100.1.10/24
> VPN tunnel peer addressing: 172.16.0.0/16
>  
> We have configured the necessary commands to allow this hairpinning..
> i.e. 'same-security-traffic permit intra-interface'. The relevant VPN
> rules and nonat are in place to allow the entire 10.100.1.0/24 range
> across the L2L tunnel and this has been tested by attempting to telnet
> to a web server at the tunnel destination via the inside 3750. 
>  
> It's just the VPN clients on the outside interface can't seem to get
> through the tunnel. What makes things even more confusing is that ICMP
> goes across no problem but no TCP traffic will pass. (No SYN-ACK
> received from the web server). I have checked the logs and they don't
> indicate that any traffic is being denied. I can see the connection
> being built twice from the outside back to the inside default gateway
> then back from the inside (maybe this is the problem do we need to make
> the vpn client pool gateway address an address on the firewall??)
>  
> 2008/11/26 15:08:48  %ASA-6-302013: Built inbound TCP connection
> 137555837 for Outside:10.100.1.101/2523 (10.100.1.101/2523) to
> Inside:172.16.1.10/80 (172.16.1.10/80) 
> 2008/11/26 15:08:48  %ASA-6-302013: Built outbound TCP connection
> 137555838 for Outside: 172.16.1.10/80 (172.16.1.10/80) to
> Inside:10.100.1.101/2523 (10.100.1.101/2523)
>  
> Thanks in advance.
>  
> Aaron.
>  
>  
>  
>  
>
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