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| From | Mark Andrews <marka@isc.org> |
| Newsgroups | comp.protocols.dns.bind |
| Subject | Re: Best way to force a TC=1 response? |
| Date | Wed, 27 May 2020 09:28:47 +1000 |
| Lines | 28 |
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> On 27 May 2020, at 07:27, John Levine <johnl@iecc.com> wrote: > > In article <mailman.442.1590526210.942.bind-users@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: marka@isc.org
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Re: Best way to force a TC=1 response? Mark Andrews <marka@isc.org> - 2020-05-27 09:28 +1000
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