Ethernet Troubleshooting

[Wayne Little]

I would like to compile an informal manual for low level (ethernet/tcp-ip)
troubleshooting using the standard tools available under SunOS (etherfind,
traffic, netstat, etc).  My motivation is that often when I'm trouble
shooting network problems, I have this queasy feeling that perhaps
something is wrong on the net that is causing the problem instead of the
system software.  We don't have the $$ at present for a Network General
Sniffer or the like, and given our typical university budget, we may not
for some time.  It also seems to me like there is a lot that can be done
just with the standard tools.

Assuming this hasn't been done, I am willing to compile submissions into
some semblance of form/order and repost it to the net.  I am also willing
to invest a few days in trying (verifying) suggestions on our Sun 3s & 4s.

In addition to collecting this information, I would also appreciate
suggestions what format would be appropriate to collect/distribute this
information in.

I think one helpful section could include something like:

1. problem description (symptoms)
  2. command used to investigate
  3. indicative output (output with interpretation - what to look for - what is
     "healthy", what is "sick")
  (2. & 3. repeated as necessary)
4. description of problem resolution

Pointers to other documentation and tools would also be helpful.

Other suggestions?

Has this already been done?

Summary:  I would like to collect info. for the net on network
troubleshooting tips, and would also like input on what content & format
would be appropriate.

Thanks,
Wayne Little      Internet: rwl at ee.umr.edu      UUCP: uunet!umree!rwl
Phone: (314) 341-4546  USPS: Univ. of Missouri-Rolla, EE Dept., Rolla, MO 65401

p.s. I cross-posted this to the sun-nets mailing list.