Canonical way for DHCP->IP->/etc/hosts
wtf.jlaine at gmail.com
Sun Dec 14 05:23:12 PST 2008
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.
> 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:
> 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>
Hello. I think pf can handle with dhcp updates on interfaces pretty well.
If only I get your question right.
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