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Re: [K12OSN] XDM too many retransmissions



Update on XDM, it was the switch! Thanks all and esp. Lewis for the help!

Dennis

Les Mikesell wrote:
On Wed, 2004-06-23 at 13:47, Jeff Kinz wrote:


Its always good to have multiple options for network equipment
especially low end switches when doing an LTSP install.

Thank you for sharing this info. It is definitely useful.


A couple of things you may run into with switches:

If one end has been locked to a specific duplex setting, at
least with Cisco equipment that will disable negotiation and the
other end is forced to assume half-duplex if it isn't also locked,
which is almost always wrong.  The mismatch causes dropped packets
and a drastic reduction in throughput although tcp retries will
tend to hide the problem.

If the switch port does not pass data while doing spanning-tree
it may take an extra 20 to 30 seconds to connect whenever
the port has dropped.  For clients you'll see this before a PXE boot
and again after the kernel is loaded and tries to get it's DHCP
address.

---
   Les Mikesell
    les futuresource com


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