[asterisk-users] Local calls not possible when Internet connection down

[Greg Troxel]

Łukasz Grzywański <lukasz.grzywanski at ccig.pl> writes:

> I think it's a problem with DNS server availability

I have tried to and mostly succeeded at making things work when the WAN
is down.   Elements needed:

  run a local named, vs configuring resolver to your ISP

  for names needed in the LAN, ensure they are answered locally without
  needing any non-local DNS records.  For me this is "foo.local" being
  in a policy zone to provide the LAN address of the host, as the WAN
  address goes away and changes

  Consider if you want to just put LAN IP addresses in your config

  actually turn off the WAN and test

  when that works, pull the cable to the ONT from the router, or
  equivalent, to simulate failure vs just deconniguring it and test
  again