Œuvres of VPn on the inside of the interface, but not outside

I have a PIX-525 with UR license.  I tried to get my VPN to work since my iphone over the weekend, but nothing helped.  Then, I changed the interface inside to see if my iMac could connect and bingo!  It worked.  I then tried to log in via the inside of the interface with my iphone and it worked.

I have connected a PIX-515e and, using the same settings, can connect to the external interface via my iPhone.

Strange.

Now, to answer the pressing questions, yes I changed the IP address of the server in my client IPSEC settings to reflect the external and internal interfaces I was testing each of them.  I was using a pré-partagées secret.  Yes, the secret has been entered correctly and they have all matched... Yes, the name of the tunnel has been entered correctly.  I used the database local user for authentication with username/password name (i.e. no certificate of authorization to make things simpler for debugging).  I changed the syslog to debugging and I see absolutely no error when you try to connect my iphone to the external interface (i.e. turn off wifi so I'm on my 3G data network).  The only thing I see is where my iphone hits the external interface and it's disassembly (or whatever his name is) but that's all.

Why this work like a charm with my PIX-515e and not my PIX-525?  VPN accelerator card in the 525 can be at fault?  The 515e doesn't have the aecellerator card.  No idea why can't I several a VPN connection inside the interface but not outside?

Hi Tim,.

Well it's not so much the DNS rewrite that is the problem (if you delete just the keyword dns VPN will still fail) but using the external interface for NAT. So all traffic intended for your address of the external interface is passed to the "gcbrouter", including vpn traffic.

I'm thinking about a way to solve this problem, but I really can't find anythign right now. Using a different interface will not work because you can have only a single default route.

I wonder if this would work:

remove the NAT interface:

not static (DMZ, external) gcbrouter netmask 255.255.255.255 dns interface

Replace with PAT interface, i.e. add such a line for each port that you want to be contactable on the DMZ server:

static interface tcp 80 gcbrouter 80 netmask 255.255.255.255 (DMZ, outside) dns

static (DMZ, outside) of the 25 gcbrouter 25 netmask 255.255.255.255 tcp interface dns

etc.

In all honesty, I have never seen rewriting dns used with PAT so not quite sure if it will work.

HTH

Herbert

Tags: Cisco Security

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