connection issues

[Oluwagbenga Shobowale]

Hi,

Can anyone help me with this issue? I have a redhat box that  connects to
the internet, hence it acts as a router. This server runs sendmail, squid,
pop3, samba etc..and all worked well at least before now.

However, recently it just stop working... When I logon locally to the
machine I can surf the internet, however other computers linux or windows
can't connect to any of its services. However, I can ping and it responds
back...

For example, on the server, I run an nslookup on any domain it get resolved,
however it does not work from any of the clients connected to it. I stop
iptables to test ..still it does not work. I ran tcpdump on port 53 and I
see traffic going in but the server does not respond with the answer. Same
goes for ssh and other services. At the end I get the amount of filters
passed and zero for the kernel. Hence I think traffic is getting into the
kernel but its not passing it back out.

 

Can someone help with this problem? Should I do a fresh installation?

Thanks

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