-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On Thu, 2016-04-28 at 20:57 +0000, Michael Wise wrote: > If the "Aware" flag expired, would best practice not be to check that > first rather than presuppose that the facility does exist?
The check for "edns aware" involves sending the query with edns extensions. If the reply is formerr (or possibly others?), then you can remember that this server does not understand edns, and repeat the query without it. If you just do the first query without edns, there is no mechanism to then learn that that server does indeed understand edns. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (GNU/Linux) iEYEAREKAAYFAlcifY8ACgkQL6j7milTFsEyTgCfbLe36v3LuECg+Ma4/mjxq52c C9oAnjFeZYZjl2//eCsWM3NvkeWwthUy =H2pv -----END PGP SIGNATURE----- _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
