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

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

Lonnie,
  Yes indeed.  Lapse of memory on my part, this is indeed something I
changed.  Rather than use a statically defined ULA I query the internal
interface to see what IPv6 address(s) is/are assigned... which could be a
ULA or a GUA or both and set them into /etc/hosts

pbx ~ # interface=br0
pbx ~ # ip_list=$(ip -6 -o addr show dev $interface scope global
2>/dev/null | sed -n -r -e 's/.*inet6 *([0-9a-fA-F:]+).*$/\1/p')

I need to fix this in my own branch.

Thanks
David


On Tue, Sep 26, 2023 at 11:09 AM Lonnie Abelbeck <li...@lo...>
wrote:

> Hi David,
>
> I looked at my setup to refresh my memory, the only IPv6 address in my
> /etc/hosts (not manually defined under Network -> {Configure DNS Hosts} )
> is INTIPV6 which is defined in the Network tab.
>
> In my case all internal IPv6 addresses are 'fd' ULA addresses, mapped with
> the "Network Prefix Translation" firewall plugin.
>
> I don't see any case where /etc/hosts entries are derived from realtime
> 'ip addr ...' values.
>
> Possibly some of your IPv6 enhancements may have changed this in your
> "develop" branch.
>
> Bottom line, if a GUA IPv6 address in entered in the Network -> Internal
> Interfaces or Network -> {Configure DNS Hosts} that would cause issues if
> the GUA prefix changes.
>
> I'm a big fan of internal ULA IPv6 addresses, mapped with the "Network
> Prefix Translation". [1]
>
> Lonnie
>
> [1] https://doc.astlinux-project.org/userdoc:tt_ipv6_ula_nptv6_config
>
>
>
> > On Sep 26, 2023, at 8:31 AM, David Kerr <Da...@Ke...> wrote:
> >
> > 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.
> > _______________________________________________
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>
>
>
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