SLOW INTERNET SPEEDS - PCS FAST! MACS SLOW AS MOLASSES!

This is pretty wierd...

I have a network on ADSL with a Netopia 3346N modem with a new router connected to it. I have 3 macs that are connected to a switch and the switch is connected a port on the router. Then I have 2 PCs and a behemoth printer connected to the second port on the router.

The PCs fly on the net, but the MACs are super slow. They are actually slow when I connect them directly to the Netopia modem too.

Could this be a wiring issue? Maybe a bad Cat5?
Daniel SheaChief TechnicianAsked:
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kyodaiCommented:
Of course you should at first cross out wiring issues, just replace the cable with the one from the PCs and see if the error is wandering. But my first idea was some bad network setting that results in a timeout (DNS query? DHCP?), so i would check your network settings first.
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ComputerTechieCommented:
i agree i would check the setting in the mac; i would evan delete the old setting reboot and readd them,

CT
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Daniel SheaChief TechnicianAuthor Commented:
More information: I have tried 2 different routers. All MACS are using TCP/IP with DHCP and pulling the appropriate information. For example:

IP: 192.168.1.10
Router: 192.168.1.1

Modem is set to provide DHCP and when MACs are connected directly to the modem, they get an ATT IP from the modem and internet seems a bit faster (and by bit, i mean like a few Kb) but not nearly as fast as the PCs.
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ComputerTechieCommented:
Try using Disk Utility is a repair program included with your system.

Open the Utility folder and then open Disk Utility.
Use that to Repair Permissions, no need to use Verify, just takes longer.
Next, boot off the OS CD
After the Installer window appears
go to the Installer Menu to Disk Utility
Run Disk Repair, you need to do this from the CD.

To boot from the CD, put it in, then restart holding the C key down until the Installer Appears.

CT
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strungCommented:
1. Make sure you have the latest firmware on the router.

2. Download and run the DNSChanger Trojan Removal Tool on the Macs:  http://www.dnschanger.com/

3. Go into the Macs Network prefs and change the MTU from 1500 to 1492. If that doesn't speed things up, change it back. (The MTU setting is under Advanced: Ethernet)
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Daniel SheaChief TechnicianAuthor Commented:
I tried the permissions thing on the macs, no go.

Settings of IPs, Gateways all good...I did notice that on one of the older macs it does take like 15 minutes to print a 4 page PDF via USB, maybe its a really old mac?

Still have to try MTU change, DNS Trojan Removal Tool, Firmware Update to Router...I'll report back soon.
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