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RE: Cisco VPN problem with DNS


Are you using the tg3 driver on the network interface you're going through to connect to the VPN? If so, try a different driver. There were (and probably still are) issues with the tg3 and Cisco VPN client.

In my case, I had a Broadcom interface, so I switched to the bcom driver (downloaded from their website) and it fixed the problem. HTH.


Subject: Cisco VPN problem with DNS
From: "Gavin McDonald" <gavitron gmail com>
Date: Thu, 8 Jun 2006 12:17:45 -0700
To: "'General Red Hat Linux discussion list'" <redhat-list redhat com>

Hi list,

I have a client with a RHEL ES 3 server, 64-bit on Pentium D-930.
We have tried Cisco VPN Client v4.7 and v4.8.

The problem is as such:

The cisco VPN client connects successfully, and IP connectivity is
established.  the RHEL client can connect to all remote servers by IP.
However, DNS is non-functional.  some digging shows that /etc/resolv.conf is
not updated correctly by the VPN client.  Where this really gets strange
though, is that even after correcting resolv.conf to point to the DNS
server, (Which he can ping and even `tracepath <DNS_IP>/53`,) DNS lookups
still fail.  he's been using /etc/hosts to define remote hosts, and name
lookups for servers defined as such work fine.

I've checked his iptables, and unless I'm mistaken, the first rule should
exlude that as the culprit:

> Chain RH-Firewall-1-INPUT (2 references)
> target     prot opt source               destination
> ACCEPT     all  --  anywhere             anywhere

this rule should catch and allow ALL traffic, right?

So at this point I'm stymied.  I have now tasked our cisco rep with
verifying the VPN server-side setup, but it appears that even if the VPN
were to hand the DNS address correctly, DNS would still fail for a reason
that eludes me.  (as manual edits to resolv.conf fail to work.)

I hope you guys can see something I missed,


Gavin McDonald
EVI Logistic Enterprises
email: me gavitron com
phone: (604) 313-3845

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