Date: Tue, 16 Dec 2008 20:22:10 +0100 From: Roger Olofsson <240olofsson@telia.com> To: glarkin@FreeBSD.org Cc: Jeff Laine <wtf.jlaine@gmail.com>, raggen@raggens.net, freebsd-questions@freebsd.org Subject: Re: Canonical way for DHCP->IP->/etc/hosts Message-ID: <4947FFE2.5050302@telia.com> In-Reply-To: <4946D452.2020104@FreeBSD.org> References: <4945035C.6040401@telia.com> <20081214132304.GA97385@free.bsd.loc> <49452D09.5030003@telia.com> <4946D452.2020104@FreeBSD.org>
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Greg Larkin skrev: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Roger Olofsson wrote: >> >> 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. >>> >>> > >> 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 > > > Hi Roger, > > I wrote a blog post about automatically configuring /etc/hosts with a > DHCP dynamic IP address earlier this year: > http://blog.sourcehosting.net/tag/dhcp/. You can download a ZIP file > with the dhclient-exit-hook script in it near the bottom of the page. > > In my case, I also wrote some commands to update the Apache httpd.conf > file with the correct ServerName directive. You can easily remove that > from the script if you don't need it. > > If you need any assistance, let me know. > > Regards, > Greg > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (FreeBSD) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org > > iEYEARECAAYFAklG1FEACgkQ0sRouByUApB1SACgmfJ4EtiyKdhyPgILZyc77Fxc > gHMAnRGGBWIya0Fg314LyrJZq9tTZvbj > =jHL5 > -----END PGP SIGNATURE----- > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > > > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - http://www.avg.com > Version: 8.0.176 / Virus Database: 270.9.18/1849 - Release Date: 2008-12-15 09:01 > Hello Greg, Thank you very much. I guess this is the canonical way of doing it. /R
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