This is a very good application for a packet sniffer to see if the bootp is
going out and if so, being answered, and what are the parameter fields.
You'd need a hub between the laptop and the ethernet jack on the CM,
to provide another connection for the analyzer. That IMHO is the only
really sure way to see what is going on. And as wel, if the hub has no
Uplink jack, then you need a crossover cable from the hub port to the
CM port (DCE to DCE etc.) If it does, connect the uplink to the CM
through a straight cable.
If you do this avoid using a windows-based sniffer unless there is a way
to make it stop broadcasting netbios registration requests.
I have a Motorola CM and it likes to see one MAC address on the client
side i.e. your machine. If you swap machines e.g. one for windows and
a different machine for linux, you'd want to hard-power reset the CM as
it stores the MAC of your client and replies to the bootp with that value.
I think their leases are running for 12 hours.
If you can run NAT and have a private address space then you can
just let the CM see the MAC of the NAT box all the time, and swap
machines on your private net at will. Have a dedicated machine for that
with 2 ethernet interfaces..
If you see an IP of 169.254.x.y on a Windows box this means that the
dhcp request failed at bootup and the machine was internally assigned an IP
of this format which is the "link-local" service. I am not sure but I
believe this is a non-routable address class.
Bob F
> -----Original Message-----
> From: Mario Lombardo [SMTP:mario@alienscience.com]
> Sent: Monday, November 12, 2001 12:20
> To: slug@nks.net
> Subject: Re: [SLUG] Network connection down
>
> I suppose if you're so sure of the dhcp request, I would check the dhcp
> server. If it's RR handing out a public address, I've had problems with
> them in the past.
>
> If it's a private hand-out, can you SSH or telnet (with Windows or
> whatever) to the dhcp server to see your MAC address in the list of
> leases? I've seen times with windows if the dhcp request wasn't
> fulfilled, it would fall back to the old address. This deception would
> appear that the dhcp server was working properly when it was not.
>
> Have you tried to release-all and renew-all on the windows boot-up? You
> may lose your network connection if the dhcp server is sour, but at
> least you'd know it was that. Sorry I can't be of more help.
>
> Mario
>
>
> Norbert Cartagena wrote:
>
> >Ok, this might seem like an odd incident: On my laptop
> >(Dell Inspiron 8000), I can't seem to get on Road
> >Runner. I can get on using windows but with Linux...
> >*pffts* Nothing. I'm using SuSE 7.2 (hopefully 7.3 by
> >the end of the day). Any hints on where I should look
> >for this problem? I've tried to restart the daemon
> >
> >/etc/init.d/dhclient restart
> >
> >And... nothing - can't grab an IP address. Here's the
> >interesting part: The command gives me the signal that
> >it does grab an address, but I can't ping anywhere
> >(return status -1: network unreachable). Also tried to
> >reset the daemon through YaST and it complains that it
> >can't grab an IP.
> >
> >Again, any hints?
> >
> >Gnorb
> >
> >=====
> >If it were not for the last minute, nothing would get done.
> >
> >-Anonymous
> >
> >__________________________________________________
> >Do You Yahoo!?
> >Find a job, post your resume.
> >http://careers.yahoo.com
> >
> >
>
>
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