Date: Sun, 14 Dec 2008 14:00:12 +0100 From: Roger Olofsson <240olofsson@telia.com> To: User Questions <freebsd-questions@freebsd.org> Subject: Canonical way for DHCP->IP->/etc/hosts Message-ID: <4945035C.6040401@telia.com>
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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
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