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Internet, Networking, and Wireless Discussion of networking, internet, and wireless including Apple's Airport products.

DHCP no longer works


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devilkin

 
Member Since: Mar 09, 2007
Posts: 21
devilkin is on a distinguished road
Mac Specs: White MB 13.3" / iPod Nano 2nd gen

devilkin is offline
Hello all,

I've got an intel macbook, and since this evening I've got something strange going on: DHCP no longer works.

Setting an ip address manually works fine, but using dhcp I either get:
- Airport: no ip
- Ethernet: the self-assigned 169.x.x.x ip.

The router that's distributing the IP adresses works, I see them going out, and the PC's on the network work fine with DHCP:

Code:
Apr 11 20:38:30 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:38:32 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:38:32 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:38:35 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:38:35 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:38:39 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:38:39 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:38:47 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:38:47 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:38:56 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:38:56 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:39:05 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:39:05 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:39:13 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:39:13 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:39:22 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:39:22 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx
But the macbook doesn't do anything with it.

I've already tried rebooting the machine, didn't help.

Any hints?

Thanks.
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cwa107

 
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Quote:
Originally Posted by devilkin View Post
Hello all,

I've got an intel macbook, and since this evening I've got something strange going on: DHCP no longer works.

Setting an ip address manually works fine, but using dhcp I either get:
- Airport: no ip
- Ethernet: the self-assigned 169.x.x.x ip.

The router that's distributing the IP adresses works, I see them going out, and the PC's on the network work fine with DHCP:

Code:
Apr 11 20:38:30 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:38:32 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:38:32 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:38:35 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:38:35 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:38:39 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:38:39 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:38:47 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:38:47 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:38:56 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:38:56 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:39:05 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:39:05 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:39:13 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:39:13 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx 
Apr 11 20:39:22 router daemon.info dnsmasq[166]: DHCPDISCOVER(br0) 00:19:e3:xx:xx:xx 
Apr 11 20:39:22 router daemon.info dnsmasq[166]: DHCPOFFER(br0) 192.168.33.x 00:19:e3:xx:xx:xx
But the macbook doesn't do anything with it.

I've already tried rebooting the machine, didn't help.

Any hints?

Thanks.
Have you recently hooked up more computers than normal to your network? Some routers will be set to only supply a handful of addresses at a time. If they run out of addresses, any computer requesting a new address will not get one and therefore assign an address in the APIPA range (169.254.0.0).

Check your router's DHCP client lease length and the number of addresses in the pool. If the lease length is long (more than a day), it will not reassign a leased address until after the lease expires.

Liquid and computers don't mix. It might seem simple, but we see an incredible amount of people post here about spills. Keep drinks and other liquids away from your expensive electronics!
QUOTE Thanks
devilkin

 
Member Since: Mar 09, 2007
Posts: 21
devilkin is on a distinguished road
Mac Specs: White MB 13.3" / iPod Nano 2nd gen

devilkin is offline
Thanks, but that's not it. I'm using statically assigned IP addresses (through DHCP), MAC's are correct and everything.

I've just noticed that it doesn't happen while using another dhcp server, so it's probably an issue with my recently-reflashed broadband router that needs investigating.

Sorry for the noise!
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