From owner-freebsd-hackers Sun Aug 4 19:46:47 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A5A8F37B400; Sun, 4 Aug 2002 19:46:40 -0700 (PDT) Received: from kpt-c-24-158-106-133.chartertn.net (kpt-c-24-158-106-133.chartertn.net [24.158.106.133]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9E45043E42; Sun, 4 Aug 2002 19:46:39 -0700 (PDT) (envelope-from ericg@chartertn.net) Received: from zaphod (zaphod.lonesome.org [192.168.1.88]) by kpt-c-24-158-106-133.chartertn.net (8.11.6/8.11.6) with ESMTP id g752jRl05024; Sun, 4 Aug 2002 22:45:29 -0400 (EDT) (envelope-from ericg@chartertn.net) Message-Id: <200208050245.g752jRl05024@kpt-c-24-158-106-133.chartertn.net> From: "Eric Olsen" To: "Kevin Oberman" , Terry Lambert Date: Sun, 4 Aug 2002 22:45:27 -0400 MIME-Version: 1.0 Subject: Re: dhcp problems with my ISP Reply-To: ericg@chartertn.net Cc: Bri , freebsd-stable@freebsd.org, freebsd-hackers@freebsd.org References: Your message of "Sat, 03 Aug 2002 03:17:17 PDT." <3D4BADAC.481BB6E3@mindspring.com> In-reply-to: <20020805011220.5E8875D03@ptavv.es.net> X-mailer: Pegasus Mail for Windows (v4.01) Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT Content-description: Mail message body Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On 4 Aug 2002 at 18:12, Kevin Oberman wrote: > > Date: Sat, 03 Aug 2002 03:17:17 -0700 > > From: Terry Lambert > > 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. > Sometimes the only way is to have the new machine spoof the MAC address of the old machine's NIC. ifconfig dc0 ether 00:01:02:03:04:05 but you gotta be careful not to end up with two machines with the same MAC address hanging around.. Eric To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message