Very strange network problem

[earache]

Came home yesterday to find the power had been off for a few hours. My G5 was off and was probably asleep prior to the power going down. Fired up the G5 and my PC and log in. PC gets on the network just fine, but the G5 does not. Strange... So I run through the network troubleshooting wizard to no avail, then notice that my IP address isn't what I expect it to be. I have my Airport Extreme set for DHCP, so my devices should all get IP's in the 10.0.1.X range. My G5 had something totally random.

Rebooted my Extreme and my G5 with the same results. PC still going strong. Finally, I turned off my Ethernet configuration, rebooted the G5, turned Ethernet back on to DHCP and viola, I'm connected. Thought I was done with the problem, go away for a few hours with the G5 still on, came back and the same network problem. Fixed it the same way. Put it to sleep overnight and this morning the same problem.

My next step is to reset my Extreme and see if that solves the problem. It's important to note that now I can't see or configure my Extreme from my G5 at this point, even though I'm connected to the net. Very strange. Anybody else have any ideas? Why would the G5 have problems if the PC didn't. They're all connected to the same network switch and to the Extreme.

[rgG]

The first thing I always try is:
turn off the modem and router
turn on the router and let it get to flashing
then plug the router back in

[olnacl]

I just ran into the same issue where the Mac didn't see the Airport Extreme in Airport Utility yet I still had internet connectivity. After trying the same things you did, I reset the AE and all is well again.

[Doc]

It's wired to the Airport box via Ethernet?

Go into your Network pref's and disable all other interfaces except Ethernet.

[earache]

rgG, already cycled power on all of my network devices. The Extreme is serving up dynamic IP's as it's supposed to, but the G5 is just not getting them.

Doc, the PC and G5 are hardwired into a network switch which is hardwired to the Extreme. All of my other interfaces are disabled.

[Doc]

What IP address did the G5 have? Was it in the 169... range?

'Tried swapping cables?

'Tried just giving it a fixed IP address?

[earache]

Doc wrote:
What IP address did the G5 have? Was it in the 169... range?

Yes, I think it was in the 169 range. I didn't pay close attention to it, but I'm pretty sure it wasn't consistent. I had wondered if the Extreme was passing on the IP from my host.

Doc wrote:
'Tried swapping cables?

Not yet, but I did try swapping ports on my switch.

Doc wrote:
'Tried just giving it a fixed IP address?

Not yet. Was going to reset the Extreme first.

[Doc]

An address in the 169 range is automatically assigned by the OS when a computer isn't receiving DHCP.

[earache]

All seems to be working now for some reason. Came home with intentions of reseting the Airport, but the G5 woke up just fine. Slept it a few times to be sure and it came back up ok. Still no access to the Airport via Airport Utility. Will probably end up reseting this weekend when I have time to do it. Thanks for all the help.