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Date:      Sat, 3 Aug 2002 17:23:07 -0500 (CDT)
From:      Ron Roskens <roskens@colltech.com>
To:        Terry Lambert <tlambert2@mindspring.com>
Cc:        Bri <brian@ukip.com>, <freebsd-stable@FreeBSD.ORG>, <freebsd-hackers@FreeBSD.ORG>
Subject:   Re: dhcp problems with my ISP
Message-ID:  <Pine.NEB.4.44.0208031706530.15573-100000@hysteria.elfin.net>
In-Reply-To: <3D4BADAC.481BB6E3@mindspring.com>

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There could be another explanation. I had this problem with a NetBSD
machine running dhclient connecting to ATTBI.

By default dhclient uses a hard-coded value of 16 for the TTL on UDP
packets. ATTBI had upgraded their network, and the DHCP server was further
away such that dhclient would never get a response.

modify src/contrib/isc-dhcp/common/packet.c and increase the value of
ip.ip_ttl to 64 in assemble_udp_ip_header().

Ron

On Sat, 3 Aug 2002, Terry Lambert wrote:

> Date: Sat, 03 Aug 2002 03:17:17 -0700
> From: Terry Lambert <tlambert2@mindspring.com>
> To: Bri <brian@ukip.com>
> Cc: freebsd-stable@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG
> Subject: Re: dhcp problems with my ISP
>
> Bri wrote:
> > Hi I have a Cable and have a Cable Modem for my internet connection of which
> > you use dhcp to obtain an IP address great but this only seems to work
> > successfully on a Windows machine I've registered all the other mac
> > addresses of unix boxes and Apple macs I have and they seem to have alot of
> > difficulty obtaining IP addresses. Especially the UNIX machines which run
> > FreeBSD 4.5-RELEASE or 5.0-CURRENT on sparc64 at the moment the sparc64 box
> > which is a Sun Ultra 5 which is the worst for detecting an IP with dhclient.
> >
> > What I would really like to know is what does the windows dhcp do
> > differently than say dhclient.
> >
> > I would be very interested to know as I would like a UNIX machine that can
> > maintain and IP address.
>
> Use the same exact NIC.
>
> Often, once the cable company sees a MAC address, it filters all
> other MAC addresses from getting a lease from your wire.
>
> The intent of this is to prevent people grabbing more than one
> lease simultaneously, or running more than one machine at a time.
>
> Ask Julian Elisher.  He had exactly this problem with a machine
> in San Francisco, 2 years ago.
>
> Note: If you ask, he will say "Yes, I had exactly this problem";
> he won't tell you anything you can do about it, except "Use the
> same exact NIC", because that's really the only fix.
>
> -- Terry


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