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Ntwrk perf worse after installing switch

By mrawson ·
I just replaced 3 16-port 10baseT hubs with 2 new NetGear 10/100 24-port switches (FS524's)and my network performance decreased drastically! My obvious intention was to improve performance but now our response time is incredibly slow over the LAN, Outlook takes forever to access the Exchange Server, it's terrible! I contacted NetGear tech support and all they offered was maybe changing my store bought CAT5 cables to a different pin-out. I'd have to change out all of my wiring! I asked about spreading out my servers over separate switches and they said sure I could try that. I do only have a 10mbs card in my server which obviously won't help but could it be the cause of my problems? I just ordered a new server yesterday with a 100mbs card in it so I didn't want to go through the pains of adding a second nic to my existing server and disabling the on-board. Any ideas?

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Ntwrk perf worse after installing switch

by turambar386 In reply to Ntwrk perf worse after in ...

Sounds like Netgear tech support isn't all
that great. I wouldn't suggest replacing
your cabling, and if their switches cannot
handle a couple of servers per switch..well,
that's an issue.

One possible cause might be failure to
properly autonegotiate duplex settings.

For instance, your older NICs may not support
full-duplex mode, or may not support
autonegotiation of duplex. If at the same
time your switch does not support
autonegotiation, or is mistakenly setting a
port to full-duplex when it shouldn't, that
would certainly cause big performance problems.

I'm rather surpised that Netgear didn't raise
this issue, or did they? If they haven't,
its worth looking in to. Try forcing your
NICs and ports to eitherfull (preferable) or
half duplex.

If this does not solve your problem, is there
any way to see a per-port breakdown of
errors? (I'm not familiar with Netgear, but
with Cisco switches you can see some decent
stats on each port). Perhaps one port is
flooding the network with broadcasts or
something.

Good luck!

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Ntwrk perf worse after installing switch

by mrawson In reply to Ntwrk perf worse after in ...

Poster rated this answer

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Ntwrk perf worse after installing switch

by NTOz In reply to Ntwrk perf worse after in ...

Im going to guess that if you purchased a netgear switch, you are a small shop. I have to guess only because I dont have enough information. I would assume you have one or two servers. I would check that I have one protocol on my workstations and matching protocols on my server. If it were nessesary to have multiple protocols on my network, I would make sure the primary protocol on my workstations was in the top of the binding order and that the server was the same. If your using for example Netbeui and TCP/IP and Netbeui is in the top of the binding order on the workstations and this netgear switch doesnt handle netbeui traffic well, seeing as its broadcast based, it will try netbeui first, time out after a period of time of trying and retrying the protocol, then moved to TCPIP and then connect. Ive seen this issue lots and lots of times. I hope this helped.

Pete

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Ntwrk perf worse after installing switch

by mrawson In reply to Ntwrk perf worse after in ...

I changed my binding order and it did actually seem to help. I'll continue looking for other items, but I think this is a great start. Thanks.

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Ntwrk perf worse after installing switch

by mrawson In reply to Ntwrk perf worse after in ...

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