Wrong Ip address to the client
Simon Hobson
dhcp1 at thehobsons.co.uk
Sun Mar 25 09:20:09 UTC 2012
Ruzsinszky Attila wrote:
> > Could you send the result of a grep 192.168.52.187 on dhcpd.leases?
>No.
>It is a HP Laserjet printer.
He didn't ask for anything from the client, he asked for a grep of
that IP address from your leases file on the server.
Ruzsinszky Attila wrote:
> > Will need to know more details :
>> What is IP address of server - is it 192.168.52.140 ?
>192.168.52.30.
>192.168.52.140 is the Ip of the AP.
Then problem found, see bwlow.
> > What is in dhcpd.conf ?
>It is a long .conf.
>Which part do you need?
As it happens now, none of it. But normally the answer is all of it -
though you can cut other subnets or lots of unrelated host statements
etc. The issue is that if you don't know what the problem is, then
you don't know what's important - so people have a tendency to cut
out bits that they think are unimportant but which in fact give vital
clues.
> > Is there anything else in the logs for 192.168.52.187 ?
>No. Nothing special.
I didn't ask if there was anything you thought special, I asked if
there was anything.
As it happens, the problem is fairly easy to see now, but in the past
we've been groping around for ages before some vital bit of omitted
information comes to light. It may seem picky, but getting everything
up front is usually better than asking for bits piecemeal.
Anyway, the answer is above.
>192.168.52.140 is the Ip of the AP
And from earlier :
>DHCPREQUEST for 192.168.52.187 (192.168.52.140) from
>60:d8:19:4d:3d:5e via eth0: lease 192.168.52.187 unavailable
This line says that the lease was offered by 192.168.52.187 (hence
why I asked what IP address your server has). Your AP is running a
rogue DHCP server (very easy mistake to make) - turn it off and
things will sort themselves out.
Probably what's happening is that the AP is getting it's responses in
first. So after a DHCP-Discover, the AP's offer arrives first. The
client then requests this, but the AP's DHCP-Ack arrives before your
server's DHCP-NAck and so the client configures itself with the
"wrong" address.
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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