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Date:      Tue, 18 Feb 2020 12:19:55 -0800
From:      Doug Hardie <bc979@lafn.org>
To:        FreeBSD <freebsd-questions@freebsd.org>
Subject:   Switching to backup Network
Message-ID:  <64F39D12-E061-4726-B58E-943D61963944@mail.sermon-archive.info>

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One of my clients has a machine running 12.1 that is connected via two =
different NICs to two different WANs.  He has drops from 2 different =
ISPs to provide redundancy. I have configured each of the DNS names with =
both IP addresses so that web access will switch over to the backup when =
the primary is down.  Setfib and pf are used to make that work.  That =
works fine (although there is a DNS timeout involved).  The problem is =
that all the servers on the machine talk out via the primary IP address. =
 While web access continues, the server initiated functions fail because =
the next hop is down.  Is there a way to switch everything over to the =
backup network in this case?  I don't find anything that enables =
automatic changes to the default network.

Also, when the backup network goes down, the default network entry for =
setfib 1 route is deleted.  I have to manually enter that when it comes =
backup.  I am initially setting that in /etc/rc.local.  Is there a way =
to make it either remain, or be restored?

-- Doug




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