OpenVPN and DNS

[jabr at blu.org (John Abreau)]

Sarah McGlinchey wrote:
> Are you using a routed or bridged VPN?  How are you determining that
> these packets are never reaching the DNS server?
> 
> Since pings work, it is unlikely this is an OpenVPN issue or a
> networking issue.  If OpenVPN is using a different subnet, you want to
> verify the nameserver will respond to queries from the new subnet. 
> Check the service for IP restrictions, as well as any firewall rules
> on the nameserver and OpenVPN server.

I'm using the routing mode, with the tun interface. I did add a route to 
the default router that passes all packets for the vpn subnet to the vpn 
server's real ip address. I opened port 1194 for both tcp and udp on the 
vpn server and on the pix firewall. I echoed a "1" into 
/proc/sys/net/ipv4/ip_forward on the vpn server.

When I set up a tunnel from my machine at home, nslookup and dig both 
time out without returning information from the nameserver, which tells 
me the nameserver either isn't receiving the queries, or isn't 
responding to them.

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John Abreau / Executive Director, Boston Linux & Unix
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