[outages] DNS SERVFAIL for nist.gov

[Stephane Bortzmeyer]

On Mon, Jun 14, 2021 at 10:52:43AM +0000,
 Geoff Snowdon via Outages <outages at outages.org> wrote 
 a message of 200 lines which said:

> There's been some chatter on NANOG - they're under DDOS attack apparently.

Indeed, most of the authoritative name servers timeout.

% check-soa -i nist.gov
bea.nist.gov.
	132.163.4.10: ERROR: read udp 193.70.85.11:60102->132.163.4.10:53: i/o timeout
	2610:20:6b01:4::10: ERROR: read udp [2001:41d0:302:2200::180]:35149->[2610:20:6b01:4::10]:53: i/o timeout
bea2.nist.gov.
	132.163.4.11: ERROR: read udp 193.70.85.11:34369->132.163.4.11:53: i/o timeout
	2610:20:6b01:4::11: ERROR: read udp [2001:41d0:302:2200::180]:47271->[2610:20:6b01:4::11]:53: i/o timeout
gea.nist.gov.
	129.6.13.3: ERROR: read udp 193.70.85.11:36517->129.6.13.3:53: i/o timeout
	2610:20:6005:13::3: ERROR: read udp [2001:41d0:302:2200::180]:60519->[2610:20:6005:13::3]:53: i/o timeout
gea2.nist.gov.
	2610:20:6005:13::4: ERROR: read udp [2001:41d0:302:2200::180]:57731->[2610:20:6005:13::4]:53: i/o timeout
	129.6.13.4: ERROR: read udp 193.70.85.11:38669->129.6.13.4:53: i/o timeout
gea3.nist.gov.
	129.6.14.193: OK: 2889174 (84 ms)
	2610:20:6005:2192::193: ERROR: read udp [2001:41d0:302:2200::180]:39170->[2610:20:6005:2192::193]:53: i/o timeout

The RIPE Atlas probes show some SERVFAILs:

% blaeu-resolve -r 100 -c US --type A nist.gov
[129.6.13.49] : 62 occurrences 
[ERROR: SERVFAIL] : 15 occurrences 
[198.105.244.131 198.105.254.131] : 1 occurrences 
Test #30851192 done at 2021-06-14T11:22:04Z