network dropouts

nemster · n00b Joined: 11 Jun 2004 Posts: 27

hi there!

from time to time my networks drops me. means i gone from irc and my ssh connection gets killed.

tuxmagi · Posted: Wed Jul 27, 2005 2:21 pm Post subject:

Try using dmesg or `tail -f /var/log/messages` to see any errors the NIC may produce. If there are any, post them, as they will help diagnose the problem.

nemster · n00b Joined: 11 Jun 2004 Posts: 27

julot · n00b Joined: 27 Aug 2003 Posts: 55 Location: Mexicus

Maybe if you change te cables and verify your Router/Switch?

Ancient 3Com cards are a very good workhorses, and many "cheap" Router/switches and hubs have the problem you already mentioned.

V.Gr. (E.G).

certain models of SMC, Cnet, New linksys and some.

And also "cheap" models of 3com, (5 port and so), within the years become uncertain, (SOHO quality).

Hope It helps.
_________________
"Sine ira et studio" Tacitus. (c.56-c.177 AD).
(With neither anger nor partiality).

the_enigma · Posted: Wed Aug 10, 2005 9:13 am Post subject:

I have a similar issue with my 3c59x. Every now and again it'll drop out, but it'll come back after 30seconds-1 minute. There is nothing at all mentioned in any logs. It used to work fine, I know, but I also know that I recently plugged it back in a different port on my switch. I'm trying a new port now to see if it changes anything.

the_enigma · Posted: Thu Aug 11, 2005 8:41 am Post subject:

I have checked, and have gotten the same results in all 5 ports on my switch, while all other PCs are fine. I also know that this NIC was fine with debian on 2.6.8. Now most of these hiccups occur whilst heavy transmission (e.g. watching mythtv over the network, copying files or something) but some have occurred while network activity has been null.
Each network stop seems to go for about 45seconds, I have trouble timiing them since I don't know exactly one will happen. Also, dmesg and /var/log/everything/current list absolutely nothing happening anywhere near these dropouts.

I'm gonna try rolling back to a 2.6.8 kernel maybe, but I have to check to see whether my DVB card is supported back then. Also I can't think of any kernel options off the top of my head that may cause/affect this situation, but I'll double check to see anything.

Actually, I do have CONFIG_PACKET_MMAP=y, that's the only relevant thing really. Unless something else may be relevant. http://www.strudel-hound.com/games.config if anyone is interested.

Oh, and I just realised, I'm running a really experimental package on my kernel, love-sources :oops:

I'll rock back to regular vanilla, see what I can do.

the_enigma · Posted: Sat Aug 13, 2005 10:38 am Post subject:

Ok, I've left the software side of things as is, but swapped my NIC for another 3C905B, exact same model but different revision (I think). So far it's been running 24 hours fine, including watching mythtv over a network.

the_enigma · Posted: Thu Aug 18, 2005 9:07 am Post subject:

Left it running a bit longer, and yep it's gone and lost connection a few times. I really don't want to change kernel versions, my HDTV card was only a recent entry. I'm gonna try some other NICs.

the_enigma · Posted: Fri Aug 19, 2005 7:30 am Post subject:

I've bought a new switch (DLink), my old one was on the brink, NFS was transferring at ~1k/s over a "100MBit" link. So, new switch, transfers jump to 11MB/s approx. All looking good. But I just had another glitch again, everything stopped for a few seconds, not sure if it's still as long though.