[Dnsmasq-discuss] DHCP request not getting to dnsmasq

richardvoigt at gmail.com richardvoigt at gmail.com
Wed Dec 26 07:19:03 GMT 2007


On Dec 25, 2007 1:47 PM, Guennadi Liakhovetski <g.liakhovetski at gmx.de> wrote:
> On Tue, 25 Dec 2007, Robin Atwood wrote:
>
> > On Tuesday 25 Dec 2007, you wrote:
> > > > > do you have any iptables rules active?
> > > >
> > > > Oh yes! But anything is accepted on the 192.168.0.0/255.255.0.0 sub-net.
> > > > We can see the bootp packet is getting through to my server.
> > >
> > > Don't know if any iptables rule can get between tcpdump and an
> > > application...
> >
> > Ok, I have fixed it! :) I put in an explicit iptables rule for dport=bootps
> > and protocol=udp and it all sprang into life. Anyone know why the rule
> >
> > -A block -s 192.168.0.0/255.255.0.0 -j ACCEPT
> >
> > was not sufficient? It works for all the other protocols.
>
> Of course not. As your laptop sends a dhcp request it doesn't have an IP
> yet... Wondering how your other clients work.

When renewing, clients would use a previous address.  Perhaps the
laptop didn't have a previous lease and thus broadcast a DHCPREQUEST
while other clients unicast a renewal request using their existing
source address.

Or perhaps the OP applied additional restrictions on the wireless interface.

>
> > Thanks to everyone who responded, particularly Guennadi who got my brain
> > turning over. Now for Christmas dinner!
>
> You're welcome. Merry Xmas:-)
> Guennadi
> ---
> Guennadi Liakhovetski
>
>
> _______________________________________________
> Dnsmasq-discuss mailing list
> Dnsmasq-discuss at lists.thekelleys.org.uk
> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>



More information about the Dnsmasq-discuss mailing list