connection issues

[Oluwagbenga Shobowale]

Thanks..in fact I thought I stopped iptable, but in was iptable6 I stopped
in services and I assumed it was iptable. Thanks.. its fine now...

From: redhat-sysadmin-list-bounces at redhat.com
[mailto:redhat-sysadmin-list-bounces at redhat.com] On Behalf Of Alder, Stephen
(GTS)
Sent: Friday, June 20, 2008 7:35 PM
To: redhat-sysadmin-list at redhat.com
Subject: RE: connection issues

Have you upgraded the kernel lately?  
I’ve seen an upgraded kernel (big jumps in arch) make changes to
/etc/sysctl.conf – where the ip forwarding kernel parameter is hardcoded.
 
Unlikely but easy enough to check and cross off as a possibility.
cat /etc/sysctl.conf | grep ip_forward
 
Steve
 
From: redhat-sysadmin-list-bounces at redhat.com
[mailto:redhat-sysadmin-list-bounces at redhat.com] On Behalf Of Oluwagbenga
Shobowale
Sent: Friday, June 20, 2008 2:00 PM
To: redhat-sysadmin-list at redhat.com
Subject: connection issues
 
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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