General discussion

Locked

Slow Network

By brad.bergen ·
I've got about 35-40 pc's on a windows 2000 domain

We have a couple of 10/100 hubs and a 10/100 switch, in monitoring the switch we have found that the average packets per sec are 2,000 - 15,000. I'm wondering if any one else has had this problemand what they did to fix. Any info would be great.

This conversation is currently closed to new comments.

9 total posts (Page 1 of 1)  
| Thread display: Collapse - | Expand +

All Comments

Collapse -

Slow Network

by Ann777 In reply to Slow Network

You really haven't given us enough info in order to be able to help you.

If you're convinced that the switches are the bottleneck, then either add switches or add RAM to the switches in order to decrease re-transmissions.

What are your server specifications?

Collapse -

Slow Network

by brad.bergen In reply to Slow Network

Not exactly sure what information you need about the servers.

I'm pretty convinced that it's the switch, just wanted a second opinion

Collapse -

Slow Network

by sgt_shultz In reply to Slow Network

are all the pc's slow or just a few?
you could try locking down the nic's to 10mb half duplex to see if that improves speed. the autonegtiation can cause a lot of traffic. do you have a lot of collisions?

Collapse -

Slow Network

by brad.bergen In reply to Slow Network

I've changed every NIC that I have to 100 MB / Half duplex
and all the ports on the switch too.

Still have the switch maxing out though

Collapse -

Slow Network

by Alpha-Male In reply to Slow Network

To start off, I'd take a look with a packet sniffer at what is going on. If you don't have Sniffer Pro or EtherPeek, go to www.ethereal.com where you'll find a great sniffer that's FREE. The help files and documentation are great also.

What you need to know is not just how many packets you have, but what kind of packets they are. If you have tons of ICMP, SNMP packets then the problem isn't with the switch, it's with your network (wasting bandwidth). You need to get a pulse for what's going on with the LAN...and the sniffer is the way. 15,000 pps to me is a huge amount for the number of users you have. I suspect you have devices that are "chattering" far more than necessary or even "rogue apps". Napster for example used to be the bane of admins everywhere for devouring bandwith and being extremely inefficient in how it did it - the old double whammy.

Have you done a baseline on you LAN? Take a look at it and the traffic. You may even want to monitor traffic over a weekend or late night to see what kind of broadcasts etc you are getting. It may be that your users send and receive massive amounts of data...but it may also be that there is a lot of wasted packets...maybe even a malfunctioning device.

If the LAN is fine andthe traffic is what you expect to have there (not a ton of broadcasts, unanswered requests, retransmissions etc) then the answer would be to add another switch, upgrade your switch or, better yet, to use a router (or bridge) to separate out the busiest parts of the network into separate collison domains.

Collapse -

Slow Network

by brad.bergen In reply to Slow Network

replaced the switch
fixed all the issues and gained to Gbps ports.

Collapse -

Slow Network

by scottsman In reply to Slow Network

are you running active directory? and DNS on your server? Are you seeing the clients logon slow?

Collapse -

Slow Network

by brad.bergen In reply to Slow Network

Yes, but I think I found the problem, replaced the switch
fixed all the issues and gained to Gbps ports.

Collapse -

Slow Network

by brad.bergen In reply to Slow Network

This question was closed by the author

Back to Networks Forum
9 total posts (Page 1 of 1)  

Related Discussions

Related Forums