[Lvlug] One Machine on Network can't see TCP/IP 192.168.0.1 (or .sometimes .2)

[Jim Trocki]

On Mon, 17 Dec 2001, Faber Fedor wrote:

> On Mon, Dec 17, 2001 at 03:08:53PM -0500, Randy Kramer wrote:
> > Faber,
> > 
> > Thanks, I forgot I (now) have Ethernet sniffers! (tcpdump is apparently
> > installed by default on Mandrake 7.2, ethereal is apparently not.)
> > 
> > At first glance, the results surprise me.
> > 
> > >From my old Linux server, I see the ping request (like "... icmp: echo
> > request"), then an "... arp who-has" and an "arp reply", 

is this 3com nic pci or an isa? you should check to see that the entry
for "eth0" (or whichever device the 3com driver initialized it as) in
/proc/interrupts has a nonzero interrupt count. if the 3com board is
isa and the autodetection failed or is misconfigured somehow, it may
not be registered in the kernel for the correct irq line. in this case
outbound packets from the broken system would likely work but inbound
packets would not.

i'm not sure which system sent the arp reply, since i haven't been
following the thread closely.