Re: Routers and resolv.conf: [was: extremely slow to ssh out from my machine]

From: Jan Nordholz (hesso_at_pool.math.TU-Berlin.DE)
Date: 02/28/05

  • Next message: michael: "Re: Routers and resolv.conf: [was: extremely slow to ssh out from my machine]" 
    Date: Mon, 28 Feb 2005 11:25:50 +0100
To: debian-user@lists.debian.org

    > On Monday 28 February 2005 09:24, michael wrote:
    > > the router (a D-Link) config again I see it has entries
    > > Configuration -> ProxyDNS 212.85.249.130
    > > Configuration -> DHCP configuration on LAN Primary DNS=192.168.0.1
    > > Configuration -> DHCP configuration on LAN Secondary DNS=212.1.130.32
    > > which lead to a /etc/resolv.conf of
    > > nameserver 192.168.0.1
    > > nameserver 212.1.130.32
    > >
    > > giving the probs for ssh as before. Could some kind soul clarify to me
    > > the diffs between the 3 entries in the router config and why the
    > > proxyDNS doesn't appear in the resolv.conf?
    >
    > I'm guessing that the following is happening: your router connects to your
    > ISP, and gets two nameservers from there. It uses one as it's own primary
    > nameserver, and the second as a secondary nameserver, of course. However,
    > the router also serves names by proxy, so instead of simply passing those on
    > to computers on the LAN, it replaces the primary NS with its OWN address.
    > So, you see the IP of the router, and the IP of the secondary nameserver on
    > your end. In short, it looks fine to me.
    >
    > --
    > Lee.

    Hi,

    I agree with Lee about how your resolv.conf gets constructed. However the
    problem still is that the router (who apparently behaves as if it were a
    query-forwarding DNS server) doesn't respond to DNS queries... is there a
    config option in your router to disable the router-internal DNS server (and
    to forward the ISP nameservers directly)?
    If not, you can only hardwire your resolv.conf to the two other nameservers
    above, and prevent it from being rebuilt. (IIRC, there is a package "resolvconf"
    that rebuilds this file on every reboot from various sources, among them
    information received via DHCP - deinstalling it or at least removing it
    from /etc/rc*.d/ should fix that)

    HTH,

    Jan (now replying from a different address) 

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