Comments on: Degraded Network Performance Mystery

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By: Anonymous

Anonymous — Wed, 09 Dec 2009 04:16:00 +0000

Unfortunately, auto negotiation between ethernet interfaces fails more often than not. It’s been de riguer for as long as I can remember to hard code data rates on Cisco ethernet switches and interconnected devices

By: network_ninja

network_ninja — Wed, 09 Dec 2009 02:16:41 +0000

Unfortunately, auto negotiation between ethernet interfaces fails more often than not. It's been de riguer for as long as I can remember to hard code data rates on Cisco ethernet switches and interconnected devices

By: edrabbit

edrabbit — Wed, 25 Nov 2009 02:52:36 +0000

Looks like the "bad checksum" errors may just be a result of TCP checksum offloading

By: edrabbit

edrabbit — Tue, 24 Nov 2009 23:23:09 +0000

The Media Server is configured to be 100Mbps Full Duplex. When I configured my MBP to be 100Mbps I set it to full duplex as well. Both machines have flow control enabled.

By: edrabbit

edrabbit — Tue, 24 Nov 2009 23:20:22 +0000

When I have the Media Server on the Linksys 10/100 router I have no speed problems, even when my MBP is on the DLink gigabit switch.

The Xbox 360 has been off for my testing and does not show an active light on the gigabit switch. When I tried unplugged the Linksys 10/100 router I still got the same crap speeds.

Several reboots both server and MBP side means new DHCP leases. Leases for both machines are static DHCP on the Linksys router.

By: Starchy

Starchy — Tue, 24 Nov 2009 22:59:41 +0000

Unfortunately, this could be the problem. If only one side is autonegotiating (or autonegotiating properly), you could end up at half-duplex (worse yet, with only one side at half-duplex) which is one way to get collisions up the cat6-hole.

By: kale

kale — Tue, 24 Nov 2009 22:56:32 +0000

Do you experience the same terrible speeds with the switch completely off the network?

What kind of speeds do you get if you disconnect the xbox and wrt (leaving the macbook and media server and the switch, configured with static IP addresses)?

Silly question, have you released and renewed your DHCP leases on all devices?

By: edrabbit

edrabbit — Tue, 24 Nov 2009 22:19:18 +0000

Even more confusing…
I just took my MBP and plugged it into the 10/100 router in the other room and had the same terrible speeds yet no “bad checksum” reports in Packet Peeper.