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DHCP = Slowed network performance?
I recently had an issue where certain computers on a segment of a LAN were experiencing very poor network speeds in transferring documents, even within the segment of the LAN. Once I assigned these computers static ip addresses, the issue went away and the machines experienced normal speeds. However, not all of the computers receiving DHCP addresses experienced this issue, even identical computers. What was the cause of this issue? I would like to stick with the DHCP for easier network maintenance, however the poor performance is unacceptable.
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Answers
DHCP cannot possibly have any effect on speed - after all all it is doing is issuing the IP Address to the computer and once you have that lease issued it shouldn't make any difference until it needs to exchange a couple of packets to renew the lease.
What do you mean by slow btw, is it taking a long time to resolve names, are ping times slow, perceived speed - i.e. copying a 1Mb file takes long etc?
What could be the issue is the options supplied from the DHCP server, e.g. DNS, WINS etc. servers which you may have different for the other clients etc.
I suggest you compare ipconfig /all and possibly ROUTE PRINT output from a "slow" computer against a fast one and DHCP set one etc.
More likely is the switch / network card having a config. mis-match with things like duplex or flow control settings etc?
Steve
A subnet mask setting that would let some of the network bits "float over" to the host part could perhaps have fingered some stack the wrong way... enticing a broadcast storm, in a manner. That would indeed affect performance negatively. But far more likely is the fact that you restarted your malfunctioning interfaces (since you reconfigured them) cured a switch/client misnegotiation. We simply cannot begin to even guess in the right direction, since the error isn't present now.
So you'll have to live with it, and keep an eye on it not happening again;-).
When/if it does happen, if you have a switch with management options, do take a look at the interface/port error counts. Could beinvaluable "tools" in diagnosing this:-).
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by: bsohn417Posted on 2009-08-06 at 09:31:07ID: 25035330
What is providing DHCP, Switch or DHCP Server?