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Re: Dual NIC's on an OS X server

tim,
Check the Duplex and Speed of your network cards. MacOS X has been known
to have problems with duplex negotiation on the network. If your network gear is set to 100 FDX (full duplex) then your MacOS X server machine will go to 100 half - causing every other packet to get lost. The best solution from Apple is to have both the Network Switch and the Machine set to AUTO-NEGOTIATE mode. (there are also some fixes for 10.2 and supposedly 10.3.3 but I found auto was the easiest solution)

How to test this? Well, connect from Machine A to Machine B using SCP or even AFP. Transfer a large file 100MB or more. See how long it takes - and watch your network gear for warning lights about transmissions problem (i.e. goes yellow all the time).

Then, go from Machine B to Machine C where B and C are in the same network in the lab - and see if the speeds are any better.


On Apr 5, 2004, at 8:55 AM, Timothy K. Wilkinson wrote:

I'm helping someone who has a new OS X server and they need to do a setup
I've never done before.

They are in a building which has a VERY shaky network. It goes up and down
regularly. Now that all of their Macs authenticate against the OS X server
when the network goes down they have problems.

The solution we'd like to use is two NIC's in the machine. One NIC will be
serving DHCP to a private network within the lab. The other NIC has their
worldly address on the campus network.

I've gotten the NIC on the internal network to server up DHCP addresses and
had the local Macs authenticate against it but it's VERY slow. However,
even with NAT turned on I can't get those machines to see the outside world.
I'm sure it's just a configuration problem on my part but I'm not sure where
to look. I've tried making the gateway for the "internal" NIC the IP of the
card going outside. I've turned on NAT and set it to the NIC that is one
the "outside". However nothing seems to work.

Has anyone had any success doing this? Anyone have a page that details how
to do this? I'd appreciate any help or suggestions.


Tim Wilkinson
ITC-ACHS
University of Virginia
email@hidden
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References: 
 >Dual NIC's on an OS X server (From: "Timothy K. Wilkinson" <email@hidden>)



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