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Re: Your "favorite" network faults

2009-04-12 20:38:08
Ethernet duplex mismatch has to be the most common (if your fast Ethernet doesn't seem to be able to push more than 5-10 Mbps, suspect this). See Stanislav's writeup :
http://shlang.com/writing/tcp-perf.html

My personal favorite is re-use of MAC addresses on an Ethernet. (There once was a switch vendor who used the same MAC address for an entire set of machines. Worked fine unless you had two on the same LAN.) That is very hard to diagnose IMO, but not common.

And, in the multicast world, there are the actions (or lack thereof) of IGMP snooping switches. That can cause a wide variety of weirdness.

On Apr 10, 2009, at 12:48 PM, Henning Schulzrinne wrote:

As part of a research project, we are working on automated diagnostics of network-related faults in residential, SOHO, conference/special event, hotel and similar networks. If you have observed errors that were hard for a lay person to diagnose, whether due to end system problems, NATs, LAN or Internet issues, please send me a brief description. (Also, contacts in tech support for such environments would be most helpful, particularly if they might be willing to talk to us.)

Henning
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Regards
Marshall
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