Re: HELP! Long ping times under Yellow Dog Linux


Subject: Re: HELP! Long ping times under Yellow Dog Linux
From: Bryan Stillwell (bstill@terraplex.com)
Date: Fri Jan 19 2001 - 18:05:22 MST


First thing to do is make sure that you're running the latest kernel.
We have a 2.2.18 kernel available at
ftp://ftp.terraplex.com/pub/updates/kernel/2.2.18/, but you may want to
try compiling one of the 2.4 kernels yourself. You can get the source
by rsync at "http://www.fsmlabs.com/linuxppcbk.html". This will most
likely solve your problem, because the kernel you are running was
probably built before your G4 was released.

Other ideas I have that might be happening is you're getting hit by a
smurf attack (ping flooding a broadcast address), or some other kind of
attack. Does your hub/switch show many collisions in network activity
when this happens?

Bryan

-- 
  Terra Soft Solutions, Inc.           | Software Engineer
  http://www.terrasoftsolutions.com/   | bstill@terraplex.com
  GPG fingerprint: 3608 4610 8C08 B8EB 0970  9686 8A93 386C 6116 EFE2

On Fri, Jan 19, 2001 at 04:56:30PM -0600, Gawain Reifsnyder wrote: >I've got a YDL box (Y2K model Mac G4/400) running a server off a >cable modem. The server isn't under much load but it seems to be >clogging up somehow and causing extremely long response times. > >If I ping other machines (our ISP's DNS server for instance) from the >YDL machine, ping times average 2000-3000 ms. There also seems to be >a spillover effect that slows down other machines on our network >until the whole network is almost unusable. When the server is >disconnected, things quickly revert to normal. > >I'm still more-or-less of a newbie so this has me stumped. Where >should I be looking? I'll provide more information about my >configuration as needed. > >A network geek friend thought the machine might be running in >promiscuous mode... > >Thanks! > > >Here's some supporting information from ifconfig: > >eth0 Link encap:Ethernet HWaddr 00:30:65:96:86:F4 > inet addr:24.2.xxx.xxx Bcast:24.2.xxx.255 Mask:255.255.255.0 > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:18368 errors:0 dropped:0 overruns:0 frame:0 > TX packets:20107 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:100 > Interrupt:41 > >eth0:0 Link encap:Ethernet HWaddr 00:30:65:96:86:F4 > inet addr:192.168.xxx.xxx Bcast:192.168.xxx.255 Mask:255.255.255.0 > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > Interrupt:41 > >lo Link encap:Local Loopback > inet addr:127.0.0.1 Mask:255.0.0.0 > UP LOOPBACK RUNNING MTU:3924 Metric:1 > RX packets:5074 errors:0 dropped:0 overruns:0 frame:0 > TX packets:5074 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:0



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