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Re: Dual NIC's on an OS X server

Ben,
I agree. duplex is an issue. However, forcing MacOS X to full, and forcing your switch to full most often still does not work. Apple recommends autoneg instead of forcing full on both side.

Otherwise - you are correct. They must match - otherwise it falls back to 100Half at best or down to 10half at worst.

Running the command
sudo ifconfig en0 mediaopt full-duplex

at the MacOS X cli still does not fix it - instead, it will say it's configured for 100FDX but still act at 100Half. :( I've spend days on this problem over the course of a year playing with the switch settings and the server settings and rebooting, etc. Auto is what Apple finally recommended and it seems to work great. (the 10.2 fix that is suggested in Apple's discussion boards worked for 10.2, but not in 10.3. Rumor has it that 10.3 now again 'fixes' the forced to full issue with most switches - but I have yet to try)

Hope that helps.

Sellers

On Apr 5, 2004, at 12:59 PM, Ben Staffin wrote:

The problem with duplex negotiation is not unique to OS X; see here for
a decent explanation:

http://www.cites.uiuc.edu/network/autosense.html

Basically you need to either set everything to auto, or configure
everything manually. Going halfway will create problems.

- Ben

* Sellers <email@hidden> [2004-04-05 10:05] wibbled:
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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--
/--
| Ben Staffin
perpetual nerd |
--/
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References: 
 >Dual NIC's on an OS X server (From: "Timothy K. Wilkinson" <email@hidden>)
 >Re: Dual NIC's on an OS X server (From: Sellers <email@hidden>)
 >Re: Dual NIC's on an OS X server (From: Ben Staffin <email@hidden>)



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