Anyone familiar with Static DNS on UniFi/USG

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wratterus

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#281510 22-Feb-2021 11:48

Have a site running a USG, we have a config.gateway.json file for a static DNS entry, this works great.

I need to add multiple static DNS entries for the same local IP (say device1.domainname.co.nz and device2.domainaname.co.nz to point to the same internal IP).

I can do this, but it doesn't behave as expected - the entries work, but don't show when the USG config is exported, and the entries can't be deleted. I suspect it's doesn't like having multiple host names set for the same IP using the set system static-host-mapping command, but can't seem to figure out how to do this correctly.

Have posted on Ubiquiti's forums about it, but it's pretty hard getting any help there these days, so thought I'd try here to see if anyone had done this before.

Thanks!

davidcole

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#2661083 22-Feb-2021 12:34

That was one way to do it.....but I think the way forward is that you add a new client in the controller software, and you can set a statis IP that way. I used to have a bunch of stuff set up like that.

Only works if the device has the same domain as your network.

Another way to do it, is to add entries in a <filename>.conf file in /etc/dnsmasq.d on the USG.

# shared named back to other machines
address=/openhab.domain.com/192.168.10.27
address=/unifi.domain.com/192.168.10.45
address=/influxdb.domain.com/192.168.10.45

I have this in a home.conf file.....but then you need to make sure when you firmware update the device to copy that file back. A bit of a pain.

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wratterus

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#2661215 22-Feb-2021 17:42

Did manage to figure this out - I just needed to make any subsequent entries aliases. Probably dead simple, just not something I've had to do before.

The initial command to create the static DNS entry looks like

set system static-host-mapping host-name device.domainname inet <ip address>

And any subsequent entries for the same IP need to be aliases, like...

set system static-host-mapping host-name device.domainname alias 1.device.domainname

And editing the config.gateway.json file to reflect that is pretty easy.