From: k...@wide.ad.jp Subject: Re: [DNSOP] draft-ietf-dnsop-root-loopback-01 Date: Thu, 26 Mar 2015 04:33:41 +0900 (JST)
> > From: Paul Hoffman <paul.hoff...@vpnc.org> > Subject: Re: [DNSOP] draft-ietf-dnsop-root-loopback-01 > Date: Wed, 25 Mar 2015 14:18:59 -0500 > >> On Mar 25, 2015, at 11:06 AM, Evan Hunt <e...@isc.org> wrote: >>> >>> On Wed, Mar 25, 2015 at 03:53:27PM +0000, Tony Finch wrote: >>>> I think you mean "common queries over UDP" since AXFR over TCP isn't a >>>> thing :-) >>> >>> Or rather AXFR over UDP isn't. TCP is mandatory for *XFR. >> >> Where is that requirement made? The only thing I see in RFC 5936 is that >> AXFR over UDP is not defined. > > Section 4.3.5 of RFC1034 says: "Because accuracy is essential, TCP or > some other reliable protocol must be used for AXFR requests." > > -- Akira Kato The current root zone size in the wire format is 539,248 byte. Provided if MTU is 1500, it consists of 367 fragments in UDP. Even if AXFR over UDP is allowed, it may not be practical to assume such number of fragments get delivered without any packet loss especially over a satellite link which is an use case of the draft. Retries could also be fail in this case. -- Akira Kato _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
