Date: 04 Aug 2002 18:26:47 +0200 From: Wouter Van Hemel <wouter@pair.com> To: "Scott M. Nolde" <scott@smnolde.com> Cc: Terry Lambert <tlambert2@mindspring.com>, Bri <brian@ukip.com>, freebsd-stable@freebsd.org, freebsd-hackers@freebsd.org Subject: Re: dhcp problems with my ISP Message-ID: <1028478407.285.4.camel@cocaine> In-Reply-To: <20020804092300.B78925@smnolde.com> References: <NEBBKKNOEKKNLLNMEOHFAEBFIKAA.brian@ukip.com> <3D4BADAC.481BB6E3@mindspring.com> <1028409791.286.9.camel@cocaine> <20020804092300.B78925@smnolde.com>
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On Sun, 2002-08-04 at 15:23, Scott M. Nolde wrote:
> Wouter Van Hemel(wouter@pair.com)@2002.08.03 23:23:11 +0000:
> > On Sat, 2002-08-03 at 12:17, Terry Lambert wrote:
> > > 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.
> > >
> >
> > Wouldn't it be possible to change the mac address? A friend of mine used
> > this method once to obtain a new ip address from the server when he was
> > being DoS'ed on his home ip by some irc kiddies.
> >
> > Ofcourse, you'd have to change the other cards' mac too, if possible.
> >
> > > [...]
> > >
> >
> > Regards,
> >
> > wouter
> >
>
> here's the way to change the MAC on freeBSD. I had to do it a few days
> ago. No big deal, this is VERY simple.
>
> A little background: If you read /etc/rc.network you'll find, before the
> ethernet interfaces are started a particular file is sought in /etc:
> start_if.nic:
> for ifn in ${network_interfaces}; do
> if [ -r /etc/start_if.${ifn} ]; then
> . /etc/start_if.${ifn}
> eval showstat_$ifn=1
> fi
>
> So, for me it was /etc/start_if.fxp1. What I had to put in this file was
> the command to change the MAC to the MAC of the old NIC.
>
> #!/bin/sh
> # force fxp1 on dual card to 00:a0:cc:28:89:82
> ifconfig fxp1 ether 00a0cc288982
>
Oh... that's even more simple than using arp(1). Does it set the card, or
just the kernel interface? I suspect the latter...
> And that took care of it. I don't need to call my cable co to reprovision
> the cablemodem for each computer. I just change the MAC at the FreeBSD
> firewall.
>
> And that's how you do it in FreeBSD.
>
> - Scott
> --
> Scott Nolde
> GPG Key 0xD869AB48
>
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