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Author Topic: multiple A/AAAA with dynamic updates  (Read 201 times)

dseomn

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multiple A/AAAA with dynamic updates
« on: September 20, 2021, 10:24:46 AM »

Is there any way to have a single name with multiple A or AAAA records pointing at different places with separate dynamic updates? I tried making two separate names with separate dynamic updates, then pointing two ALIAS records from the same name to those dynamic names, but I'm only getting a single record when I look up the ALIAS name.

Dynamic records:
Code: [Select]
uriel.mandelberg.org A 300 74.104.157.60
chusuk.mandelberg.org A 300 32.212.241.128

Static records:
Code: [Select]
test123.mandelberg.org ALIAS 300 uriel.mandelberg.org
test123.mandelberg.org ALIAS 300 chusuk.mandelberg.org

Code: [Select]
$ host test123.mandelberg.org
test123.mandelberg.org has address 32.212.241.128

Is there any way to set up a name that returns records for both addresses above, where each address can be changed separately by a different dynamic dns client?
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snarked

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Re: multiple A/AAAA with dynamic updates
« Reply #1 on: September 20, 2021, 11:01:13 AM »

Probably not.  The whole point of a dynamic address update is that any (and all) prior address(es) are invalid when the record is updated with a new address.  You must use separate labels to maintain more than one dynamic destination (one label per destination).  IPv4 and IPv6 dynamic addresses can coexist under a single label because they are different RR-types.

ALIAS, CNAME, and DNAME records take a single destination only.  Multiple instances of these RR-types are forbidden.

If youíre trying to do something like load balancing or failure rollover, look at SRV records if the application or protocol you intend to use supports them.
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dseomn

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Re: multiple A/AAAA with dynamic updates
« Reply #2 on: September 20, 2021, 11:47:30 AM »

I thought ALIAS wasn't a real record type, so the DNS server software could do whatever it wanted to do with it? I want failover for HTTPS, so I don't think there's anything like SRV that would work for that.
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snarked

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Re: multiple A/AAAA with dynamic updates
« Reply #3 on: September 21, 2021, 10:47:24 AM »

It canít hurt to add them in the hope that someday HTTP will support them, but donít hold your breath.
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