Weird issue with bind & router

[John W. Blue]

Chris,

First, what a strange problem to have.

You really need to spend some time capturing the traffic placed on the wire via tcpdump and then slicing it up for clues with wireshark.

If you set a continuous ping to the router that would be a good timestamp that you can use to correlate as a marker.  When it stops responding look at all of the other traffic around that time.

I doubt that it will be BIND but stranger things have happened before!

Good luck.

John

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From: Chris Serella <serella_c at hotmail.com>
Sent: May 25, 2017 9:24 AM
To: bind-users at lists.isc.org
Subject: Weird issue with bind & router


I run a small dev system on my home network, housing dns etc all under the one server.

System: ubuntu16.04 server, ispconfig etc etc etc, you get the idea.

Anyway, the problem i am having comes down to the router rebooting (is it crashing? I cant tell) every time bind starts/restarts. This ordinarily wouldnt be an issue, DNS rarely changes so the service does not need restarting but the problem occurs on system boot too.

The router in question is a Plusnet Hub One which I believe is actually a repackaged BT Hub 5. The "server" is an ACER AX3300 desktop with ubuntu server installed.

Troubleshooting was difficult as i couldnt isolate what it was until i went over to ISPConfig for assistance, they informed me that a DNS reload on their software simply saves data to files and initiates a service restart.

With this information to hand I made no changes to the DNS in ISPConfig, instead i opened a terminal and tunnels into the server and issued a bind9 restart from there.

Sure enough the problem reared its ugly little head, The ssh session dropped out and looking over to the router i could see it was going through its power cycle. To be sure this wasn't some freakishly well timed coincidence, I completed the steps several times more (3) all with the same result.
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