On Oct 12, 2005, at 8:06 AM, Brian Stewart wrote:
Local NetWork Support, nothing to do with apple
My laptop can not get a DHCP address, it gets a default 169.X.X.X.
I try a second laptop and a second ethernet drop. No DHCP, most
likely a problem with the two laptops, two network drops or one
DHCP server?
<Spock> There is insufficient data, Captain, to reach a conclusion </
spock>
<McCoy> I'm a Computer Tech, Jim, not a Mind Reader!</mccoy>
What is doing the DHCP serving? What is the network infrastructure?
What do you mean by Ethernet "drop": are you testing on different
jacks in a building, ports on a router, or just different cables? Do
either of the laptops work in other ethernet networks?
there could be any number of reasons:
Many DHCP servers require some sort of authentication or registration
before they'll pass an address.
Cable modems usually do this: they'll only connect to the first
ethernet device they "see" after being reset. Our own network
requires that the MAC address of devices be registered before being
given an IP address.
On another subnet on campus, they got tired of folks moving systems
around without telling them, so they've added a twist on the cable
modem thing. Once you plug a 'wrong' device into a port, it's locked
out to all devices until they unlock it.
You could have miscommunication between two auto-sensing devices,
this is rare with new equipment, but older 10/100 switches would
often get into an "After you, Gaston!" "No, No, After YOU, Alphonse!"
routine where both ports would try to auto-sense and end up on
different speeds.
You could have a bad ethernet switch or hub in the mix. You could
have a mis-wired ethernet hub or switch in the mix. (A sysadmin on
campus was trying to diagnose a similar problem through a rats nest
of hubs and switches and found, eventually that the WAN port of one
switch was feeding back, through a number of other devices, into a
lan port on itself.)
You could have two bad laptops, or two bad cables, or two bad ports,
but I think it's unlikely.
--
Bruce Johnson
This is the sig who says 'Ni!'
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