Re: dhclient doesn't respond to DHCP OFFER
From: Andrew Schulman (andrex_at_deadspam.com)
Date: 10/07/03
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Date: Tue, 07 Oct 2003 05:13:26 -0400
> On the first machine, I've flushed iptables
And set the default policy to ACCEPT? Sorry, but that's about my only idea
here.
You could use some iptables logging to see whether it sees the incoming
OFFERs and ACKs.
The information you gave about what does and doesn't work on the different
machines is helpful. It sure makes your problem sound like a firewall
problem. Okay, here's another idea: make sure that the policy on all of
the nat and mangle chains is also set to ACCEPT. I got screwed by this
once-- I set them to REJECT by mistake, and my whole network ground to a
halt until I finally figured it out a week later. (Including loopback, so
my whole system slowed to a crawl.)
iptables --policy INPUT ACCEPT
iptables --policy OUTPUT ACCEPT
iptables --policy FORWARD ACCEPT
iptables -t nat --policy PREROUTING ACCEPT
iptables -t nat --policy POSTROUTING ACCEPT
iptables -t nat --policy OUTPUT ACCEPT
iptables -t mangle --policy PREROUTING ACCEPT
iptables -t mangle --policy INPUT ACCEPT
iptables -t mangle --policy FORWARD ACCEPT
iptables -t mangle --policy OUTPUT ACCEPT
iptables -t mangle --policy POSTROUTING ACCEPT
Good luck,
Andrew.
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