Stop named truncating
Jim Reid
jim at rfc1035.com
Mon Aug 7 11:03:14 UTC 2000
>>>>> "Jens" == jugger2000 <jugger2000 at my-deja.com> writes:
Jens> Hi all, asking the authoritive name server directly will
Jens> gets the full content. asking the authoritive name server
Jens> via another name server will truncate after 512 characters.
Jens> Question is it possible to change the parameters for named /
Jens> BIND or disable the truncation?
You are mistaken. If *any* name server has to send >512 bytes of
answer, it sends a truncated response. Whether the server is
authoritative or not is irrelevant. The client that sent the query is
then supposed to repeat the query using a TCP connection to retrieve
all the data. You'd need to rewrite RFC1035 , get that agreed as a
standard and have every DNS implementation upgraded and deployed
world-wide to change that 512 byte limit. EDNS0 - defined in RFC2671 -
provides a backwards compatible mechanism for allowing larger payloads
in DNS UDP packets. However it's not yet widely implemented and
deployed. IIUC it's only implemented in BIND9.
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