[dns-operations] EDNS issue

[Michael Graff]

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On 2011-02-25 4:32 PM, Mark Andrews wrote:
> What is needed is test queries (IPv4 and IPv6) that will only succeed
> if the UDP path is good for 4096 byte EDNS.
> 
> 	dig @server1 ipv4-testname txt
> 	dig @server1 ipv6-testname txt

Sort of like "dig 1024.pathtest.isc.org txt +bufsize=4096" ?  :)

Replace 1024 with anything you like from 1 through 4095.

It does not return a specially crafted packet, but it guarantees a TXT
record that contains exactly that many bytes in it.  It's garbled data
(literally, from /dev/urandom when I made this) so it should not
compress much.  I'm old enough to remember compression making some
things sneak through pipes where the uncompressed size would not, and
covered my bases.

- --Michael
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