[Astlinux-devel] /etc/hosts file after internet outage

[David K. <da...@ke...>]

Comcast went down on me again overnight.  It did not recover on its own, I
had to reset the cable modem.  Astlinux handled it well with one exception,
on recovery I noticed that DHCPv6 had delegated me a new /60 subnet...
different from before.  It is in fact the first time comcast has changed
the IPv6 delegated subnet for me ever.  So in abundance of caution I went
and grep'd to see if I had hardcoded the old /60 subnet somewhere.

All I found was the /etc/hosts file that was not updated so the IPv6
address for "pbx" on the local LAN was set using the old subnet.

This is set by /etc/init.d/network and also /etc/init.d/dnsmasq

It feels like dnsmasq should be restarted if the external network interface
goes down and then comes back up.  This may be done already (have not
researched that) but the setting of /etc/hosts is done in the "init" part
of the code, not the "start" part of the code, so a "restart" is not good
enough.  I manually ran a service dnsmasq stop followed by service dnsmasq
init and that rebuilt the hosts file.  But could this be done automatically?

Thanks
David.