Date: Mon, 12 Oct 2009 23:30:35 -0400 From: David Horn <dhorn2000@gmail.com> To: Doug Barton <dougb@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: Wacky DHCP values that work in windows but not in FreeBSD Message-ID: <25ff90d60910122030r1f8511e9ued9535024fa3078a@mail.gmail.com> In-Reply-To: <4AD3ABD0.7010603@FreeBSD.org> References: <4AD3ABD0.7010603@FreeBSD.org>
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On Mon, Oct 12, 2009 at 6:21 PM, Doug Barton <dougb@freebsd.org> wrote: > Howdy, > > I usually have a wireless router connected directly to the AT&T/Yahoo > DSL modem but last night I wanted to do some debugging so I plugged my > laptop directly into the modem (after powering off the modem, etc.). > > The values I got back from DHCP not only don't make sense, they didn't > work in FreeBSD at all. Dual-booting to Windows showed that the values > I saw from DHCP were "correct," and somehow they managed to work. > Taking a closer look at the router after I plugged it back in showed > the same. > > =A0 =A0 =A0 =A0Dhcp Enabled. . . . . . . . . . . : Yes > =A0 =A0 =A0 =A0Autoconfiguration Enabled . . . . : Yes > =A0 =A0 =A0 =A0IP Address. . . . . . . . . . . . : 76.212.147.xxx > =A0 =A0 =A0 =A0Subnet Mask . . . . . . . . . . . : 255.255.0.0 > =A0 =A0 =A0 =A0Default Gateway . . . . . . . . . : 151.164.184.xxx > =A0 =A0 =A0 =A0DHCP Server . . . . . . . . . . . : 192.168.1.xxx > =A0 =A0 =A0 =A0DNS Servers . . . . . . . . . . . : 192.168.1.xxx > > Can anyone tell me how they managed to get this to work in Windows, > and suggest where to look to get it working in FreeBSD? > > > Doug > Without seeing the actual tcpdump of the dhcp packets, I would guess that this is the Classless Static Route option in DHCPv4 (option 121). See: http://www.rfc-editor.org/rfc/rfc3442.txt http://www.iana.org/assignments/bootp-dhcp-parameters/ But tcpdump before dhclient initialization of the interface should show what options are in play (I could be wrong on option 121) tcpdump -vvv -i em0 port bootpc Good Luck. ---Dave H
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