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I have Ubuntu 12.04, kernel 3.13. It can take 1sec to run "dig localhost" when computer is connected to Internet. When it is disconnected it is much faster. I checked /etc/hosts, I tried disabling dnsmasq in Network manager. Nothing helps. Applications that call localhost, just stop for a fraction of a second until Ubuntu goes to resolve localhost to remote servers. I search everywhere and did not find a solution. Can someone help me with this ?

; <<>> DiG 9.8.1-P1 <<>> localhost ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40343 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION: ;localhost. IN A

;; ANSWER SECTION: localhost. 10800 IN A 127.0.0.1

;; Query time: 359 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Sat Feb 7 23:02:10 2015 ;; MSG SIZE rcvd: 43

  • You say that you checked /etc/hosts, was localhost there? Also, dig uses DNS rather than the system resolver library, meaning that it will not use hosts and is not particularly suited for testing what a normal application will do. – Håkan Lindqvist Feb 7 '15 at 22:21
  • My /etc/hosts: 127.0.0.1 localhost 127.0.1.1 donald plus the usual IPv6 stuff. ping localhost is 0.03ms. I noticed the problem the first time when I was debugging Linphone. It takes unusually long for Linphone to register on the same machine. It takes hundreds of miliseconds, while it should be 1ms. – user269259 Feb 7 '15 at 22:32
  • ping will not actually tell you how long it took to resolve the name, though? What does for instance time getent ahosts localhost say? – Håkan Lindqvist Feb 7 '15 at 22:55
  • 127.0.0.1 STREAM localhost 127.0.0.1 DGRAM 127.0.0.1 RAW 127.0.0.1 STREAM 127.0.0.1 DGRAM 127.0.0.1 RAW real 0m0.002s user 0m0.000s sys 0m0.000s – user269259 Feb 7 '15 at 22:57

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