> On 27 May 2020, at 07:27, John Levine <jo...@iecc.com> wrote: > > In article <mailman.442.1590526210.942.bind-us...@lists.isc.org> you write: >> What's the best way to force an A query via UDP to return a TC=1 result: >> a really long CNAME chain? > > I'd suggest lots of AAAA records. You could do it with A records but you'd > need four times as many
Well ~2 times as many. Each additional A record requires 16 bytes and each addition AAAA records requires 28 bytes. That means ~256 A records and ~146 AAAA records to force TCP with a 4096 byte UDP buffer size. John’s example had 187 AAAA records. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
