DNS funky when using Cisco IOS w/ IPFW

Discussion in 'Cisco' started by Brian Bergin, Feb 2, 2004.

  1. Brian Bergin

    Brian Bergin Guest

    When I use our 2620 with IOS 12.3.1a with IPFW I have a problem with DNS
    resolution from systems outside the LAN served by the 2620 when they VPN to the
    office (not using Cisco's VPN). What happens is the private IP of the FQDN, say is translated to the public NAT IP of the static NAT mapping.
    That's a problem when I try to map a drive or printer, or use pretty much
    anything else on that box that's not allowed by the public IP's ACL. If I
    remove the 2620 and replace it with a 1710 with straight IP it works great. Is
    this some kind of "fix up" to borrow from the PIX that IPFW is doing to DNS to
    translate? If so, how do I force it to stop doing that? Thanks...

    Brian Bergin

    I can be reached via e-mail at

    Please post replies to the group so all may benefit.
    Brian Bergin, Feb 2, 2004
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.