[Bug 1687482] Re: -4 flag doesn't work

[Bryce Larson]

I'm running xenial.  After I saw your comment I tried it on zesty and
have yet to run into this bug on zesty.  I haven't tried in the same
environment yet though, I can try that later this week as well as get an
apport-collect done.

As you can see below, the last login reports an ipv6 address.  I
verified it is using ipv6 using iftop as well.  I also tried your
trivial case and the same thing happened.

We are running freeipa, I don't know if that would have an effect or
not.

If it's fixed in zesty, is there any way to get the same fix into
xenial?


bryceml at ratpoison:~$ ssh -4 sake
Welcome to Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-75-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

0 packages can be updated.
0 updates are security updates.

Last login: Tue May  2 08:50:11 2017 from 2620:10f:3007:a068:1a66:daff:fe1f:a85
bryceml at sake:~$ logout
Connection to sake closed.
bryceml at ratpoison:~$ ssh -4 sake
Welcome to Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-75-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

0 packages can be updated.
0 updates are security updates.

Last login: Tue May  2 08:50:27 2017 from 2620:10f:3007:a068:1a66:daff:fe1f:a85
bryceml at sake:~$ host sake
sake.cs.byu.edu has address 192.168.168.107
sake.cs.byu.edu has IPv6 address 2620:10f:3007:a068:1a66:daff:fe1f:d96f
bryceml at sake:~$ 



bryceml at ratpoison:~$ ssh -4 ip6-localhost
The authenticity of host 'ip6-localhost (<no hostip for proxy command>)' can't be established.
ECDSA key fingerprint is SHA256:nhU3sXqrZoF3zNUxlWAfuLebsMSFhRuycFFWHlL2RRY.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'ip6-localhost' (ECDSA) to the list of known hosts.
Welcome to Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-75-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

0 packages can be updated.
0 updates are security updates.

Last login: Tue May  2 08:43:46 2017 from 2620:10f:3007:a080:1a66:daff:fe1f:1057
bryceml at ratpoison:~$ logout
Connection to ip6-localhost closed.
bryceml at ratpoison:~$ ssh -4 ip6-localhost
Welcome to Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-75-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

0 packages can be updated.
0 updates are security updates.

Last login: Tue May  2 08:57:16 2017 from ::1
bryceml at ratpoison:~$

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to openssh in Ubuntu.
https://bugs.launchpad.net/bugs/1687482

Title:
  -4 flag doesn't work

Status in openssh package in Ubuntu:
  Incomplete

Bug description:
  Whenever I use the -4 flag on ssh, it still uses the ipv6 address from
  dns instead of forcing ipv4 like it says it is supposed to do in the
  man page.

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