Re: [squid-users] DNS lookup failure when transparent proxy

Hi steve,

Start caching DNS on proxy server and put ur server's private ip as
the primary DNS on client and the things will go.

I think the problem with ur existing configuration is that the private
ip which u r using on ur clients , they are not known by ur DNS
server.

r u avle to ping ur dns server from ur clinet . if u r able to do that
than ur configuration will work otherwise it won't.

For more detail reason kindly give a rough sketch of ur setup
Regards
dev

On 5/13/05, Steven Morris <steven.morris@tripleplay-services.com> wrote:
> Hi,
>
> I've installed squid version 2.5 release 9 on redhat linux fedora core 3 and
> setup a proxy server (with 2 ethernet ports) between my LAN and the
> internet.
> I've successfully configured Squid so the proxy server runs transparently
> and intercepts all http requests from clients on the LAN.
> When I enter IP address's (including the IP address for google) in the
> client's web browser URL, the pages are served fine, but when I enter a
> domain name in the URL,
> the browser returns the 'Page Cannot be displayed message'.
>
> The client machine and proxy (in /etc/resolv.conf) both know our ISP
> nameservers IP address and I've configured the proxy server firewall to
> allow DNS lookups via UDP on port 53.
>
> If the client browser is configured to use the proxy server (rather than
> have it run transparently), DNS lookups work fine and domain name URL pages
> are displayed.
> I would however, really like to get DNS lookups working with a transparent
> proxy setup.
>
> I can't see it myself but would this involve changing settings in
> squid.conf?.. or perhaps some form of iptables forwarding command for DNS
> responses on UDP port 53? (ie to forward incoming
> responses from the nameserver to the proxy back to the client machines on
> the LAN).
>
> Any possible solutions would be greatly appreciated.
>
> Regards,
>
> Steve
>
>
Received on Fri May 13 2005 - 06:22:26 MDT