Slave fails failover - ReadList.com

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Slave fails failover
\ Jan Engelhardt (27 Jul 2006)
. \ Winfried Magerl (27 Jul 2006)
. \ Pete Ehlke (28 Jul 2006)

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Subject:	Slave fails failover
Group:	Bind-users
From:	Jan Engelhardt
Date:	27 Jul 2006

Hello,

as commonly done, I have two DNS servers for a domain, that is, the
toplevel zone at the hoster is

$ORIGIN xyz.com.
jen IN NS dns1.foo.com. (running ISC BIND 9.3.2)
jen IN NS dns2.bar.com. (also ISC BIND 9.3.2)

$ORIGIN foo.com.
dns1 IN A 1.2.3.4

dns1's zone file is (shortened):

$ORIGIN xyz.com.
@ SOA ...
IN A 1.2.3.4

dns2 is configured as a slave to dns1. Trying to resolve xyz.com from
anywhere in the world usually yields 1.2.3.4, which is ok.

Now that dns1 is powered off, I noticed that xyz.com cannot be resolved
anymore, even though that should have been the purpose of having slave
servers, is not it?

The dns2 logfile says

Jul 27 11:44:16 dns2 named[5652]: zone jen.xyz.com/IN: refresh: retry
limit for master 1.2.3.4#53 exceeded (source 0.0.0.0#0)
Jul 27 11:44:16 dns2 named[5652]: zone jen.xyz.com/IN: Transfer started.
Jul 27 11:44:19 dns2 named[5652]: transfer of 'jen.xyz.com/IN' from
1.2.3.4#53: failed to connect: host unreachable
Jul 27 11:44:19 dns2 named[5652]: transfer of 'jen.xyz.com/IN' from
1.2.3.4#53: end of transfer

Should not dns2 have kept the zones of the last successful transfer and use
them?

Jan Engelhardt
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