From owner-freebsd-questions  Tue May 15 12:40:23 2001
Delivered-To: freebsd-questions@freebsd.org
Received: from grumpy.dyndns.org (user-24-214-76-217.knology.net [24.214.76.217])
	by hub.freebsd.org (Postfix) with ESMTP id 9849637B422
	for <freebsd-questions@FreeBSD.ORG>; Tue, 15 May 2001 12:39:59 -0700 (PDT)
	(envelope-from dkelly@grumpy.dyndns.org)
Received: from localhost (localhost [127.0.0.1])
	by grumpy.dyndns.org (8.11.3/8.11.3) with ESMTP id f4FJdl548367;
	Tue, 15 May 2001 14:39:47 -0500 (CDT)
	(envelope-from dkelly@grumpy.dyndns.org)
Message-Id: <200105151939.f4FJdl548367@grumpy.dyndns.org>
X-Mailer: exmh version 2.3.1 01/18/2001 with nmh-1.0.4
To: Chip Wiegand <chip@wiegand.org>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: ISP is forcing a change from static to dynamic IP Addresses. :-( 
In-Reply-To: Message from Chip Wiegand <chip@wiegand.org> 
   of "Mon, 14 May 2001 16:55:20 PDT." <20010514165520.1f0ee839.chip@wiegand.org> 
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Date: Tue, 15 May 2001 14:39:47 -0500
From: David Kelly <dkelly@grumpy.dyndns.org>
Sender: owner-freebsd-questions@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

Chip Wiegand writes:
> My ISP recently informed all their customers they have reorganized their
> system, received new ipaddress ranges and are requiring everyone to go
> to dynamic ip addresses. They say the dynaminc address given will be 
> staticly mapped, so in essence it will be 'perminant'. I have a machine 
> setup with fbsd4.2, it is my router/firewall, running IPFW/NATD. 
> I have had a static ip address for a couple years, now I have to change. 
> I'm not sure what I have to do to make the change. 
> Any suggestions would be appreciated. (Including changing ISP's).

This is all it takes in /etc/rc.conf for me:

ifconfig_fxp0="DHCP"

Now, its much harder to deal with the firewall rules on change of IP
address (happens every couple of months) but I do it like this in 
/etc/dhclient-exit-hooks:

#!/bin/sh

(
date
echo ${reason:-NO_REASON_GIVEN}

case ${reason} in
        BOUND|REBIND)
		# May or may not be a new address.
		# adds $old_ip_address to working variables
		# use :-number to force behavior if variables are missing
		if [ ${old_ip_address:-0} != ${new_ip_address:-1} ]
		then
		    if [ X${new_ip_address%\.[0-9]*\.[0-9]*} = "X192.168" ]
		    then 
			echo "do nothing: darned modem IP address ${new_ip_address}" 
		    else
                	. /etc/dmk.firewall 
			# if one is using DynDNS:
			echo /usr/local/sbin/ddup --host grumpy.dyndns.org --static 
			/usr/local/sbin/ddup --host grumpy.dyndns.org --static 
			# set 
		    fi
		else
			echo "addresses did not change (${reason})" 
		fi
                ;;
	REBOOT)
		echo "reboot"
#		echo "re-init firewall"
#		/bin/sh /etc/dmk.firewall 2>&1
		echo `date`
		;;
	*)
		echo "nothing needed (${reason:-NOT_SPECIFIED})" 
		;;
esac

if [ X${old_ip_address} != "X" ]
then
	echo "old_ip_address = " ${old_ip_address}
fi

if [ X${new_ip_address} != "X" ]
then
	echo "new_ip_address = " ${new_ip_address}
fi

) 2>&1 >> /home/dkelly/dhclient.debug

-- 
David Kelly N4HHE, dkelly@hiwaay.net
=====================================================================
The human mind ordinarily operates at only ten percent of its
capacity -- the rest is overhead for the operating system.



To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message