Date: Sun, 14 Dec 2008 16:58:01 +0100 From: Roger Olofsson <240olofsson@telia.com> To: Jeff Laine <wtf.jlaine@gmail.com>, freebsd-questions@freebsd.org Subject: Re: Canonical way for DHCP->IP->/etc/hosts Message-ID: <49452D09.5030003@telia.com> In-Reply-To: <20081214132304.GA97385@free.bsd.loc> References: <4945035C.6040401@telia.com> <20081214132304.GA97385@free.bsd.loc>
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Jeff Laine skrev: > On Sun, Dec 14, 2008 at 02:00:12PM +0100, Roger Olofsson wrote: >> Dear mailing list, >> >> I am sorry if this question has been asked over and over again - however >> the htdig search interface for the lists is somewhat shaky and gives >> referrer errors for me. >> >> Pre-conditions. >> Dualhomed firewalled FreeBSD7.1. One nic is LAN and the other dynamical >> IP from ISP. >> >> Question: What is the canonical way for catching the IP address from a >> DHCP assigned nic (from ISP that doesn't set hostname) and put the IP >> into /etc/hosts with a hostname? >> >> Reason for asking >> Firewall rules needs refreshing after new IP >> >> Possible answers: >> Create dhcp-exit-hooks (undocumented?) in /etc like so: >> >> #!/bin/sh >> >> if [ ! -z "$new_ip_address" ]; then >> IP=`ifconfig WAN | grep 'inet' | grep -v 'inet6' | cut -f 2 -d ' '` >> if [ ! -z "$IP" ]; then >> echo "$IP wan.local.domain wan" >> /etc/hosts >> >> <refresh firewall rules here> >> >> fi >> fi >> > > Hello. I think pf can handle with dhcp updates on interfaces pretty well. > If only I get your question right. > > > > > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - http://www.avg.com > Version: 8.0.176 / Virus Database: 270.9.17/1847 - Release Date: 2008-12-13 16:56 > Hi Jeff and thank you for your reply, Yes, I know that pf will handle interfaces just fine, the question was not specific to pf though but more around dhclient, dhclient-script and the part of dhclient-script that calls the undocumented dhclient-exit-hooks. It might be handy to have the external IP assigned to a hostname - not only for pf. /R
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