Bug 1894

Summary:

ssh requests ipv6 addresses even with ipv6 disabled

Product:

Portable OpenSSH

Reporter:

jchadima

Component:

ssh

Assignee:

Assigned to nobody <unassigned-bugs>

Status:

NEW ---

Severity:

normal

CC:

djm, jchadima, jfch, perso

Priority:

Version:

5.8p1

Hardware:

All

OS:

Linux

Attachments:

Description	Flags
patch solving the problem	none

Description jchadima 2011-04-27 20:13:11 AEST

ssh tries to resolve and use ipv6 addresses even if ipv6 is disabled. This is caused by the inappropriate flags for getaddrinfo. I'm not sure if this is only glibc nuance or it is a global bug.

Comment 1 jchadima 2011-04-27 20:14:08 AEST

Created attachment 2036 [details]
patch solving the problem

Comment 2 Damien Miller 2011-06-03 10:51:12 AEST

How does this problem manifest? If a host no IPv6 addresses configured but getaddrinfo returns AF_INET6 addresses and attempts to use them, then these connections should harmlessly and quickly fail. Is something else happening?

Comment 3 jchadima 2011-06-03 17:34:36 AEST

problem is with DNS servers which do not correctly responds to AAAA records, this cause inability of resolution.


the full description is at
https://bugzilla.redhat.com/show_bug.cgi?id=699421

Comment 4 Mélanie Chauvel 2019-08-24 02:35:36 AEST

With openssh 8.0p1, openssh hangs a very long time trying to use an IPv6 then falls back to IPv4. I had to explicitly disable IPv6 in NetworkManager, although no other software I use had a problem with it.

Does this match the current bug report or should I open a new one?