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Bug 45987

Summary: removing --with-ipv4-default from openssh
Product: [Retired] Red Hat Raw Hide Reporter: Pekka Savola <pekkas>
Component: opensshAssignee: Nalin Dahyabhai <nalin>
Status: CLOSED RAWHIDE QA Contact:
Severity: medium Docs Contact:
Priority: low    
Version: 1.0Keywords: FutureFeature
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Enhancement
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2001-06-26 08:12:09 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Pekka Savola 2001-06-26 08:12:05 UTC 
WIth current glibc's (tested on RHL62 and RHL71), it's pretty safe to
remove
'--with-ipv4-default' from openssh compile-time options.

This makes it so that when you connect like 'ssh some.box' ssh will first
do a AAAA
(IPv6) DNS lookup, and after that fails (~0.1 sec or less), does the normal
A query.

Some other vendors have also been enabling this, e.g. Mandrake apparently.

In practise, all this means is you don't have to use 'scp -6' or 'ssh -6'
when connecting
to ipv6 hosts.

Only apparent side-effect I have noticed (apart from AAAA query), on a box
where there is no IPv6 is:

Jun 26 10:45:23 pajulintu modprobe: modprobe: Can't locate module net-pf-10

when sshd is started.   This is good because if there would be 'alias
net-pf-10 ipv6' 
in /etc/modules.conf, sshd would autoload it which wouldn't be the intent
(the alias is added by initscripts if NETWORKING_IPV6 is set)
Comment 1 Nalin Dahyabhai 2001-09-06 12:52:34 UTC 
This change will be made for 7.x systems in 2.9p2-7 and later.  Thanks!