[96860] in RedHat Linux List
Re: DHCP accross router??
daemon@ATHENA.MIT.EDU (William Stearns)
Thu Oct 29 17:18:47 1998
Date: Thu, 29 Oct 1998 16:59:34 -0500 (EST)
From: William Stearns <wstearns@pobox.com>
To: redhat-list@redhat.com
cc: Josh Kuperman <sar_kuper@sals.edu>
In-Reply-To: <3.0.5.32.19981029152434.007c46e0@mailx.netheaven.com>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
On Thu, 29 Oct 1998, Josh Kuperman wrote:
> This gets weirder and weirder. The router lets bootp work accross the
> router as well so I'm pretty sure the message is getting through to the
> DCHP server. I tried repeatedly to change the configs and restart the
> networking. The DHCP server is on a Dec Alpha VAX. I tried to run
> /sbin/dhcpcd with numerous options including -r, but the result was always
> the same. I would get a message to the log that said
>
> no DHCPOFFER
>
> and then it would die. The only option I can imagine is something to do
> with the Identification. I don't know how the machine identifies itself to
> the server in Windows 95.
Oh, darn! I'm not sure if you need it, but try running this line
from the command line as root:
/sbin/route add -host 255.255.255.255 eth0<Enter>
This tells your machine where to send the DHCP request;
specifically, it dumps it out to the Ethernet lan. I suspect that your
linux box didn't know where to send the request - it's a networking nit
that hasn't been gracefully resolved yet.
Then try those commands again. To see if the packets are actually
leaving your machine and if any responses arrive back, try:
tcpdump -i eth0 -qltn | egrep '(\.68|\.67)'<Enter>
(briefly, show me all the packets on eth0, but only show ones with either
".67" (bootp/dhcp server port) or ".68" (bootp/dhcp client port)).
If this attempt doesn't work, mail me the output from the above
and I'll see what I can do.
Cheers,
- Bill
[original message snipped]
---------------------------------------------------------------------------
Unix _is_ user friendly. It's just very selective about who its friends
are. And sometimes even best friends have fights.
William Stearns (wstearns@pobox.com)
Mason, buildkernel, and named2hosts are at: http://www.pobox.com/~wstearns
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