[aprssig] rotate.aprs2.net (trusted: arrl.net)

Bob Poortinga aprssig.10.bobp at xoxy.net
Fri Sep 21 15:06:12 CDT 2007

On 9/21/07, Phillip Pacier <ad6nh at arrl.net> wrote:

> Thanks for your note.  The rotate address has had 20+ addresses in it for
> as long as it has been in use, and you are the first person to note a
> problem with it.  After doing some research, I cannot find anything about
> a limit to the number of addresses that DNS round robin will support - but
> I could be wrong.  When I do an nslookup with my Windows machines, it will
> only return 8 of the addresses in the list, but I do not see an error
> message.

What is probably happening is that the response packet that the DNS server
is returning for this query is greater than the DNS UDP limit of 512 bytes.
What this means is that the resolver must make a TCP connection to get the
full packet.  Some resolvers will do this, others won't (sometimes by policy
or firewall settings).  Some will just use the truncated results in
the UDP packet.

The query really shouldn't be returning more than 8 addresses anyway.  You
should probably setup revolving zones in the DNS servers for aprs2.net.

73 de
Bob Poortinga K9SQL
Bloomington, IN  US

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