Ondřej Surý bb990030d3 Simplify the EDNS buffer size logic for DNS Flag Day 2020 ... The DNS Flag Day 2020 aims to remove the IP fragmentation problem from the UDP DNS communication. In this commit, we implement the required changes and simplify the logic for picking the EDNS Buffer Size. 1. The defaults for `edns-udp-size`, `max-udp-size` and `nocookie-udp-size` have been changed to `1232` (the value picked by DNS Flag Day 2020). 2. The probing heuristics that would try 512->4096->1432->1232 buffer sizes has been removed and the resolver will always use just the `edns-udp-size` value. 3. Instead of just disabling the PMTUD mechanism on the UDP sockets, we now set IP_DONTFRAG (IPV6_DONTFRAG) flag. That means that the UDP packets won't get ever fragmented. If the ICMP packets are lost the UDP will just timeout and eventually be retried over TCP.		2020-10-05 16:21:21 +02:00
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bind9	Fix function overrides in unit tests on macOS	2020-09-28 09:09:21 +02:00
dns	Simplify the EDNS buffer size logic for DNS Flag Day 2020	2020-10-05 16:21:21 +02:00
irs	Fix function overrides in unit tests on macOS	2020-09-28 09:09:21 +02:00
isc	Simplify the EDNS buffer size logic for DNS Flag Day 2020	2020-10-05 16:21:21 +02:00
isccc	Fix function overrides in unit tests on macOS	2020-09-28 09:09:21 +02:00
isccfg	Fix function overrides in unit tests on macOS	2020-09-28 09:09:21 +02:00
ns	Simplify the EDNS buffer size logic for DNS Flag Day 2020	2020-10-05 16:21:21 +02:00
samples	The dns_message_create() cannot fail, change the return to void	2020-09-29 08:22:08 +02:00
win32/bindevt	update all copyright headers to eliminate the typo	2020-09-14 16:20:40 -07:00
.gitignore	Provide unit test driver	2020-05-21 12:13:01 +02:00
Makefile.am	Complete rewrite the BIND 9 build system	2020-04-21 14:19:48 +02:00
unit-test-driver.sh.in	Provide unit test driver	2020-05-21 12:13:01 +02:00