This morning I see this in the syslog on our primary public DNS host.
internal_send: 142.77.1.1#33950: Connection timed out: 1 Time(s) internal_send: 142.77.1.1#35153: Connection timed out: 1 Time(s) internal_send: 142.77.1.1#35644: Connection timed out: 1 Time(s) internal_send: 142.77.1.1#49394: Connection timed out: 1 Time(s) internal_send: 142.77.1.1#49816: Connection timed out: 1 Time(s) internal_send: 142.77.1.1#49929: Connection timed out: 1 Time(s) internal_send: 142.77.1.1#50281: Connection timed out: 1 Time(s) internal_send: 142.77.1.1#50453: Connection timed out: 1 Time(s) internal_send: 142.77.1.1#50534: Connection timed out: 1 Time(s) . . . (x100s)
dig -x 142.77.1.1
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.23.rc1.el6_5.1 <<>> -x 142.77.1.1 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31154 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 3
;; QUESTION SECTION: ;1.1.77.142.in-addr.arpa. IN PTR
;; ANSWER SECTION: 1.1.77.142.in-addr.arpa. 604800 IN PTR ns.uunet.ca.
;; AUTHORITY SECTION: 77.142.in-addr.arpa. 86400 IN NS ns.uunet.ca. 77.142.in-addr.arpa. 86400 IN NS AUTH01.NS.UU.NET. 77.142.in-addr.arpa. 86400 IN NS NS2.uunet.ca.
;; ADDITIONAL SECTION: AUTH01.NS.UU.NET. 167 IN A 198.6.1.81 ns.uunet.ca. 86400 IN A 142.77.1.1 NS2.uunet.ca. 86400 IN A 142.77.1.5
;; Query time: 114 msec ;; SERVER: 216.185.71.33#53(216.185.71.33) ;; WHEN: Thu May 1 09:59:50 2014 ;; MSG SIZE rcvd: 176
What is this and why is it happening?