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Date:      Sun, 20 Jun 2021 08:42:46 -0600
From:      Ian Lepore <ian@freebsd.org>
To:        Rozhuk Ivan <rozhuk.im@gmail.com>, freebsd-net@freebsd.org, freebsd-hackers@FreeBSD.org
Subject:   Re: How to run script on network address change?
Message-ID:  <29b67c76692658ba3618a2b1f9d62a7b77501247.camel@freebsd.org>
In-Reply-To: <20210620165215.0f3dd15c@rimwks.local>
References:  <20210620165215.0f3dd15c@rimwks.local>

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On Sun, 2021-06-20 at 16:52 +0300, Rozhuk Ivan wrote:
> Hi!
> 
> 
> I have FreeBSD 13@amd64 router with DHCP client on uplink.
> 
> How to run script on IP address change?
> 
> 
> I do not see events from devd, only:
> !system=IFNET subsystem=em3 type=LINK_DOWN
> !system=IFNET subsystem=em3 type=LINK_UP
> 
> 

You could use /etc/dhclient-exit-hooks script to take action after an
IP address is bound.  See the manpage for dhclient-script for more
info.

-- Ian





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