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TOPIC: CISCO VPN Client version 4.6 and PIX 515E VPN trouble

CISCO VPN Client version 4.6 and PIX 515E VPN trouble 13 years 8 months ago #9122

Greetings. Interesting and informative place.

I have a laptop running the subject VPN Client
I have a PIX 515E running in stateful failover mode with a VAC
I attempted to replace the VAC with a VAC+, and not having a brain in my head on a late Saturday night, I just pulled open the PIX and switched the cards. The remote access users then began to call. I've been working on this problem for a week and am at my wits end. I do keep good notes, and so reconfigured the VPN with exactly the same command set I had used originally with no success.

Here is a copy of the (sanitized) relavent portions of the PIX configuration:
ip address outside 255.255.255.X
ip address inside 255.255.255.X

#Note: The IP networks for access-list "split" and access-list "nonat_inside" are the same

access-list split permit ip 192.168.XX.0 192.168.X1.0
access-list nonat_inside permit ip 192.168.XX.0 192.168.X1.0

Note: Local pool "vpnpool1" includes addresses from the same subnet as configured in the access-lists above
ip local pool vpnpool1 192.168.X1.X-192.168.X1.X

nat (inside) 0 access-list nonat_inside

route outside 1

Many routing statements .......
route inside 192.168.X1.X 255.255.X.X 1
More Routing Statements .........

sysopt connection permit-ipsec

crypto ipsec transform-set standard esp-3des esp-md5-hmac
crypto dynamic-map clientvpn 10 set transform-set standard
crypto map map1 10 ipsec-isakmp dynamic clientvpn
crypto map map1 client authentication LOCAL
crypto map map1 interface outside
isakmp enable outside
isakmp identity address
isakmp nat-traversal 20
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption 3des
isakmp policy 10 hash md5
isakmp policy 10 group 2
isakmp policy 10 lifetime 5000
vpngroup GroupName address-pool vpnpool1
vpngroup GroupName dns-server domain-controller
vpngroup GroupName wins-server domain-controller
vpngroup GroupName default-domain
vpngroup GroupName split-tunnel split
vpngroup GroupName idle-time 1800
vpngroup GroupName password ********

username someuser password somepassword encrypted privilege 2

I get good ISAKMP packet trades, good DPD packets, actually a good connection to the VPN from the remote. All indications from the client log are that everything is copasetic. Then I look at the syslog output and see:

%PIX-3-106011: Deny inbound (No xlate) udp src outside:domain-dns/53 dst outside:192.168.X1.X/3554

AAAHHHHH! What am I missing here? Thoughts, suggestions, more info required?

Arigato Gozaimasu

Re: CISCO VPN Client version 4.6 and PIX 515E VPN trouble 13 years 5 months ago #10425

Well, from the looks of the logged message, it gives the appearance as though you have a NAT issue. But I don't think this is the case... The traffic that the log was depicting looks like a return packet for a DNS query from a VPN client to possibly your Internal DNS server - however, according to the log message, the PIX thinks the interface that the DNS server is on is also the outside interface... so there's no defined translation for that, thus the message is logged - a strange log message indeed.

So, is the problem VPN? No... you are clearly encapsulating and decapsulating packets, or else this message would never have appeared.

One thing that jumps out at me in the config you supplied is your route statment:

route inside 192.168.X1.X 255.255.X.X 1

You defined it as an internal route, but is this not the subnet (or at least part of it) of your VPN address pool? If so, then you need to specify specifically the VPN address pool portion routes to the outside interface... for example, if was your VPN address range, and the rest of was on the internal network, you should have two routes:

route inside 1
route outside 1

Try changing that (based on your real IP addresses) and see if things clear up... I could be wrong, it's hard to determine the actual issue without seeing a more complete configuration.

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