I hope this question isn't too far off topic but I'm having a very weird
network problem and don't know where to ask it. Perhaps someone could
point me in the right direction. I have an unusual packet loss problem
that has me stumped.
Working at home with a cable modem connected to a Linksys WRT54G router.
Behind the router are two computers. One is a Linux server and a windows
XP notebook.
The Linux box is accessable to the outside world because I opened 3
ports in the NAT. Port 22,25,and 53. The server acts as a name server
for the domains I host and it also is a backup spam filtering server
receiving many incomming connections on port 25 and sending out far less
good email also on port 25 to various other server who I am the front
ens spam filter for.
Linux box is running FC5 with the latest stock FC5 kernel. Some flavor
of 2.6.16.
Here's the problem. I can ping the router gateway 192.168.2.1 fine from
both computers with no packet loss if I turn off the Exim SMTP daemon.
But if I turn it on then I get about 10% packet loss pinging the gateway
on both the Linux and Windows computers, both plugged into the Linksys
router.
Thinking it might be the quantity of traffic I tried uploading a large
file with rsync ovser SSH which creates a lot more traffic than the SMTP
traffic (which is about 50k or so) and no packet loss.
I only get packet loss if I have Port 25 traffic.
So - what could cause traffing on just port 25 to cause 2 computers to
have backet loss? Could it be related to the number of connections? It
does seem like when I turn on the SMTP that it takes a little while
before the packet loss starts. Say 3 minutes or so.
Thanks in advance.
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