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Author Topic: DHCP weirdness
littlefish
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Icon 1 posted November 03, 2004 13:23      Profile for littlefish   Author's Homepage     Send New Private Message       Edit/Delete Post   Reply With Quote 
So my network is being weird. Sometimes when my mac awakes, it has the wrong ip. The setup is a cable modem which is attached to a netgear router. The netgear is attched to an airport extreme base station.

Anyway, when the mac awakes, it has an ip in the range allocated by the airport, and can't access the net. (As far as I remember it is 10.1.....) If i open the network control pane and hit the 'renew dhcp lease' button, it gets a proper IP in the 192.168.... range and can connect.

Is there any way of ensuring my computer renews its lease from the right router? FWIW the netgear router is dynamically assigned an ip from the isp. I've been living with this for a while and hoping it would go away, but it seems to have gottn worse recently. Any ideas?

Posts: 2421 | From: That London | Registered: Nov 2001  |  IP: Logged
Tut-an-Geek

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Icon 1 posted November 03, 2004 15:08      Profile for Tut-an-Geek   Author's Homepage     Send New Private Message       Edit/Delete Post   Reply With Quote 
There's a competition for a DHCP server. Whichever responds first wins. Why not just turn off dhcp on the airport?
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littlefish
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Icon 1 posted November 03, 2004 15:42      Profile for littlefish   Author's Homepage     Send New Private Message       Edit/Delete Post   Reply With Quote 
quote:
There's a competition for a DHCP server. Whichever responds first wins. Why not just turn off dhcp on the airport?
Can I do that? It's also giving out IP's to a wireless powerbook. Whenever I manually renew the lease it comes from the right router.
Posts: 2421 | From: That London | Registered: Nov 2001  |  IP: Logged
csk

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Icon 1 posted November 03, 2004 16:48      Profile for csk     Send New Private Message       Edit/Delete Post   Reply With Quote 
Hmm, that makes it more tricky then. Can the Airport DHCP server be configured to ignore requests from certain MAC(as in network card id) addresses? Or (flip side of same coin) only respond to requests from a certain group of MAC addresses?

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Posts: 4455 | From: Sydney, Australia | Registered: Jan 2003  |  IP: Logged
Tut-an-Geek

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Icon 1 posted November 03, 2004 17:00      Profile for Tut-an-Geek   Author's Homepage     Send New Private Message       Edit/Delete Post   Reply With Quote 
quote:
Originally posted by littlefish:
quote:
There's a competition for a DHCP server. Whichever responds first wins. Why not just turn off dhcp on the airport?
Can I do that? It's also giving out IP's to a wireless powerbook. Whenever I manually renew the lease it comes from the right router.
You can tell it *not* to distributed IP's on the ethernet LAN.

I see no reason to begin with why you should need to be using an airport to NAT an allready natted network, but whatever.

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Mr Bill
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Icon 5 posted November 04, 2004 14:47      Profile for Mr Bill     Send New Private Message       Edit/Delete Post   Reply With Quote 
Why is your airport passing IPs to the WAN side?
Assuming the setup is from modem to WAN port on router then from port(n) to Wan port on airport, the airport should only be requesting an IP from it's WAN port, not supplying them. Unless you have the LAN port on the airport connected to the router by accident, but then I can't see how the wireless connections would work.
[Confused] [Confused]

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CommanderShroom
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Icon 1 posted November 04, 2004 15:16      Profile for CommanderShroom     Send New Private Message       Edit/Delete Post   Reply With Quote 
There "should" be no reason for running the DHCP on the airport if you already have it on another router. If you turn the DHCP off on the airport it should allow the requests to go through.*


*Since I am not a Mac person, take what I say with a grain of salt.

Posts: 2472 | From: Utarrrrggggghhh!!!!!!!! | Registered: Mar 2003  |  IP: Logged
littlefish
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Icon 1 posted November 04, 2004 16:32      Profile for littlefish   Author's Homepage     Send New Private Message       Edit/Delete Post   Reply With Quote 
Hmmm. Airport admin utility is telling me it can't read the configuration file. As for NAT, I believe that is not switched on. Whether it is connected through the WAN/LAN port I don't know, but previously when it was connected through the wrong port, it didn't work at all. Anyway, cheers for the help I'll be troubleshooting this weekend...
Posts: 2421 | From: That London | Registered: Nov 2001  |  IP: Logged


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