Date: Sun, 04 Aug 2002 18:12:20 -0700 From: "Kevin Oberman" <oberman@es.net> 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: <20020805011220.5E8875D03@ptavv.es.net> In-Reply-To: Your message of "Sat, 03 Aug 2002 03:17:17 PDT." <3D4BADAC.481BB6E3@mindspring.com>
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> Date: Sat, 03 Aug 2002 03:17:17 -0700 > From: Terry Lambert <tlambert2@mindspring.com> > Sender: owner-freebsd-stable@FreeBSD.ORG > > 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. I have found that the problem is fixed by re-starting the cable modem when a different NIC is inserted. The problem was not with DHCP, but with the cable modem's forwarding table. My experience was with the old Motorola CyberSurfer modem used by @Home in its early days. Not sure that this applies to other or newer cable modems. R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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