[Bug 883201] Re: Several second hang on ssh login

[Michael Nagel]

*** This bug is a duplicate of bug 417757 ***
    https://bugs.launchpad.net/bugs/417757

** This bug has been marked a duplicate of bug 417757
   [regression] all network apps / browsers suffer from multi-second delays by default due to IPv6 DNS lookups

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https://bugs.launchpad.net/bugs/883201

Title:
  Several second hang on ssh login

Status in “openssh” package in Ubuntu:
  New

Bug description:
  This problem is new since 11.04. It only occurs when connecting to a
  server that I have not recently connected to. The problem still
  remains after commenting out all lines in /etc/ssh_config.

  To reproduce:

  Check that DNS is operating correctly:

  joel at joel-vm:~$ host testp1-db  # this is instant
  testp1-db.mydomain.com has address 192.168.2.50
  joel at joel-vm:~$ host 192.168.2.50 # this is instant
  50.2.168.192.in-addr.arpa domain name pointer testp1-db.mydomain.com.

  Connect to the server:

  joel at joel-vm:~$ ssh -vvv root at testp1-db
  OpenSSH_5.8p1 Debian-7ubuntu1, OpenSSL 1.0.0e 6 Sep 2011
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug1: Applying options for *
  debug2: ssh_connect: needpriv 0

  <At this point, there is a hang of several seconds and then everything
  follows normally>

  debug1: Connecting to testp1-db [192.168.2.50] port 22.
  debug1: Connection established.

  
  Connecting to the server subsequently works at normal speed.

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