[conspire] Network Latency on LAN

Rick Moen rick at linuxmafia.com
Thu Jul 26 14:52:34 PDT 2007

Quoting Bill Moseley (moseley at hank.org):

> Here's ifconfig on the Thinkpad.
> eth0      Link encap:Ethernet  HWaddr 00:1A:6B:68:B3:AD  
>           inet addr:  Bcast:  Mask:
>           inet6 addr: fe80::21a:6bff:fe68:b3ad/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:9575 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:6005 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:100 
>           RX bytes:5915672 (5.6 MiB)  TX bytes:1278094 (1.2 MiB)
>           Base address:0x3000 Memory:ee000000-ee020000 

Please pardon my being desparately short of time (and my apologies to
Darlene Wallach on the same grounds), but on the basis of only a few
seconds' scrutiny, I can't help noticing that there's no stanza for
"lo", the loopback network interface.  If that really is missing from
your ifconfig output, I'd not be surprised at a huge variety of bizarre
and troubling network problems.

If you merely didn't include the "lo" paragraph, then this is a false

> ssh sessions to the laptop exhibit a lot of latency.

Could also reflect lack of reverse nameservice.  But it would then be
odd if _only one_ Linux box showed this symptom, and other boxes didn't.

Again, I've not had time to read and analyse properly, so the above is
absolutely off the top of my head in a hurry.  Again, sorry about that.

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