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9.1

Cisco ASA VPN and NAT issue

Asked by kevin_todd in Virtual Private Networking (VPN), Cisco PIX Firewall

Tags: Cisco ASA, VPN, firewall, NAT, Address Translation

Hi Experts,

I hope you can help.  We are in the process of switching our firewall vendor to cisco.  I am attempting to configure an ASA for our management environment.  We are also going to use it for vpn access.  I have an issue with address translation.

We have 4 networks on the ASA

Network A  a.a.a.a/24  security level 100
Network B  b.b.b.b/24  security level 50
Network C  c.c.c.c/24  security level 50
Netword D  d.d.d.d/28  security level 0

I have setup dynamic rules which allow Network A to communicate with Network B, C and D. (D being the outside world)  This all works perfectly.  My issue is with network B and C.  They both neet to talk to the outside world.  So I have create a dynamic nat policy to allow them out.  This worls fine when i use the network Dinterface and PAT, and also works when i configure a global pool on network D and use that for the translation.

My issue is with the VPN (IPSEC and SSL vpns are experiencing the same problem).  The vpn endpoint is on Network D.  (the external ip of the firewall.) The vpn client then gets an address on network A.  I can then connect to everything on network A, B, and C.  But when the translation rule on network C for outbound nat is put in place, the vpn client can no longer ping a host on network C.  The logs indicate that there is no translation rule.  When I remove the outbound nat rule for network C, the vpn client can then ping the hosts on network C again.

Can anyone shed some light, and tell me what Im doing wrong?  

Thanks in advance.

[+][-]09/29/09 03:21 AM, ID: 25447365Expert Comment

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[+][-]09/29/09 05:17 AM, ID: 25448005Expert Comment

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[+][-]09/29/09 06:05 AM, ID: 25448498Author Comment

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[+][-]09/29/09 07:23 AM, ID: 25449364Author Comment

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[+][-]09/29/09 12:16 PM, ID: 25452330Accepted Solution

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About this solution

Zones: Virtual Private Networking (VPN), Cisco PIX Firewall
Tags: Cisco ASA, VPN, firewall, NAT, Address Translation
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Solution Provided By: Darkstriker69
Participating Experts: 2
Solution Grade: A
 
 
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