MailListReader wrote:
>
> Hi:
> This may not be the best place to talk about this, but anyway
> . . . on my home network I experiance massive amounts of collisons, but
> only when talking to my main workstation box. This box has a 3Com 905C in
> it. Although transfers seem to be fast and error free, everytime I look
> at 'ifconfig' my collisions are through the roof (my hub's collision
> light stays lit when doing heavy transfers too). Currently 'ifconfig'
> gives the output of 528,733 collisions, since the box was turned on 17
> days ago . . .
> It seems I have tried everything: different hubs, shorter
> (uncoiled) cat5 cables, and even 3Com's own kernel module, but no
> go. When calling 3Com they act there is no problem with this many
> collisons (although they think it is quite odd that it is happening).
Reasons for collisions are very wide and varied... a sampling:
- hub w/10base2 port: terminate it, some hubs have term switch which won't work
- poor quality cables and connectors
- out of spec crystals causing elastic buffer over/underflows in hub, resulting
in "jams" which are counted as collisions. If forcing small packet sizes
reduces or stops collisions, you may have bad crystal(s).
- "<huge vendor> networking enhancements"... I've seen this vendor's hw/sw
generate 30% collisions on a server--10bT--Cat5rolled--10Bt--client
point-to-point "network".
- NFS/UDP config'ed with large "block" size
- N * etc
While the [high-level] "transfers seem to be fast and error free", the low-level
protocols are in the flusher...
Not much to go on; but until you've found *AND* fixed it, everything will be
speculation without varied and very pricey monitoring equipment...
HTH,
Pierre
> Thanks for any help.
>
> --
> **------------**
> Nick Webb
> [EMAIL PROTECTED]
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