DHCP problem

atos · n00b Joined: 05 Mar 2006 Posts: 15 Location: Sweden

Been running my gentoo box on a stable DSL connection for quite some time. I recently upgraded to an optofibre connection instead. This also forced me to change my ISP. Heres is where the problem appears.

The Gentoo box wont recieve a gateway from the DHCP. Everything else appears to work to my knowledge. It receives an IP and DNS and everything apart from a gateway adress. This problem is nonexistant on a windows system which I realised after a while. I can run a ping between the two machines just fine but I can't reach outside the IPrange provided.

Now, obviously theres something on the windows computer that allows it authenticate with the gateway. What this could be beats me.. the question is, how do I emulate this crap? I'm taking this as a final resort before I call the ISP. Cause if they can filter out Gentoo but not Windows there has got to be somethign fishy about the whole thing.

This is what I get from ifconfig. Typed it all manually so there might be some errors.

ior ~ # ifconfig

eth0 Link encap:Ethernet HWaddr 00:0B:5D:7C:C1:A3
inet addr:*.*.*.* Bcast:*.*.*.* Mask:255.255.255.0
UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1
RX packets:512 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:33593 (32.8 Kb) TX bytes:2480 (2.4 Kb)
Interrupt:11 Base address:0xe000
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nielchiano · Veteran Joined: 11 Nov 2003 Posts: 1287 Location: 50N 3E

there are 2 possibilities: they filter you out or gentoo doesn't understand the gateway.

You could try the note down the gateway you got in Windows, and add it manualy in gentoo, see if that works.
If it doesn't, you could start sniffing the DHCP exchange on windows and on gentoo and look for differences. The nice thing about computers is that they're deterministic: same input = same output...

atos · n00b Joined: 05 Mar 2006 Posts: 15 Location: Sweden

Yeah, I've tried to do "route add default gw" but the response I get is network unreachable.

I planned on using Gentoo as a router. But if I am unable to solve this issue I'll have to try with another linux dist I suppose.
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He who have the most toys when he dies wins.

nielchiano · Veteran Joined: 11 Nov 2003 Posts: 1287 Location: 50N 3E

atos · n00b Joined: 05 Mar 2006 Posts: 15 Location: Sweden

Unfortunatly I lack the knowledge to do so, you wouldnt happen to have any link etc to push me in the right direction?
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He who have the most toys when he dies wins.

atos · n00b Joined: 05 Mar 2006 Posts: 15 Location: Sweden

Realised the broadcast was wrong now. I wonder why I recevied a .1 Broadcast instead of .255. =(

Right, set it up manually and added default gw and it works. But I should not be forced to do that. =(

Time to call the support and tell them to fix their dhcp. =)
_________________
He who have the most toys when he dies wins.