[Bug 1804487] Re: systemd-resolved has issues when the answer is over 512 bytes with EDNS disabled
Brian Murray
brian at ubuntu.com
Wed Nov 28 00:26:29 UTC 2018
** Also affects: systemd (Ubuntu Disco)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1804487
Title:
systemd-resolved has issues when the answer is over 512 bytes with
EDNS disabled
Status in systemd package in Ubuntu:
New
Status in systemd source package in Disco:
New
Bug description:
Querying a domain name that has >512 bytes in records (e.g. 30+ A
records), the number of results depends on the DNS client used:
- If the client supports EDNS:
$ dig +noall +answer testing.irongiantdesign.com @127.0.0.53 | wc -l
30
- If the client does not support EDNS:
$ dig +noedns +noall +answer testing.irongiantdesign.com @127.0.0.53 | wc -l
29
Normally a client that doesn't support EDNS would receive a truncated
reply from the initial UDP connection (limited by the spec to 512
bytes) and a second query would be established via TCP to receive the
complete results. In this case, the number of results is the same
regardless of the protocol used (29).
Upstream bug: https://github.com/systemd/systemd/issues/10816
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