Comcast DNS Assistance?

Stephane Bortzmeyer bortzmeyer at nic.fr
Mon Jul 6 15:13:44 UTC 2020


On Sun, Jul 05, 2020 at 09:30:27AM -0400,
 Dave Dechellis <dechellis at gmail.com> wrote 
 a message of 15 lines which said:

> Last night we made some changes to our DNS-SEC environment at Tufts
> University and all changes seem to have propagated - but we're having
> issues resolving against Comcast's DNS servers.

RIPE Atlas probes on the Comcast AS do not show problems:

% blaeu-resolve --as 7922 --type MX --requested 100 --displayvalidation tufts.edu
[ (Authentic Data flag)  5 ppagent-prod-01.uit.tufts.edu. 5 ppagent-prod-02.uit.tufts.edu. 5 ppagent-prod-03.uit.tufts.edu. 5 ppagent-prod-04.uit.tufts.edu. 5 ppagent-prod-05.uit.tufts.edu. 5 ppagent-prod-06.uit.tufts.edu.] : 70 occurrences 
[5 ppagent-prod-01.uit.tufts.edu. 5 ppagent-prod-02.uit.tufts.edu. 5 ppagent-prod-03.uit.tufts.edu. 5 ppagent-prod-04.uit.tufts.edu. 5 ppagent-prod-05.uit.tufts.edu. 5 ppagent-prod-06.uit.tufts.edu.] : 28 occurrences 
[ERROR: SERVFAIL] : 1 occurrences 
Test #26172909 done at 2020-07-06T15:07:12Z

(The one SERVFAIL seems to be on a probe which does not use Comcast resolvers.)






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