Bug 197105 - postfix does not listen on ipv6 interfaces by default
postfix does not listen on ipv6 interfaces by default
Status: CLOSED RAWHIDE
Product: Fedora
Classification: Fedora
Component: postfix (Show other bugs)
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All Linux
medium Severity medium
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Assigned To: Thomas Woerner
: Reopened
Depends On:
Blocks: IPv6Blocker
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Reported: 2006-06-28 11:36 EDT by Dennis Gilmore
Modified: 2007-11-30 17:11 EST (History)
1 user (show)

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Last Closed: 2007-11-29 09:36:44 EST
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Description Dennis Gilmore 2006-06-28 11:36:18 EDT
Description of problem:
 
postfix has a configuration option to turn on ipv6 support.  with the push for 
supporting ipv6  this  should be enabled by default
from http://www.postfix.org/IPV6_README.html

/etc/postfix/main.cf:
    # You must stop/start Postfix after changing this parameter.
    inet_protocols = ipv4       (DEFAULT: enable IPv4 only)
    inet_protocols = all        (enable IPv4, and IPv6 if supported)
    inet_protocols = ipv4, ipv6 (enable both IPv4 and IPv6)
    inet_protocols = ipv6       (enable IPv6 only)

we currently don't have this in the config  it should be inet_protocols = all  
that way things wont break if the end user disables ipv6 support on their 
system

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Comment 1 Dennis Gilmore 2007-07-09 20:53:56 EDT
ping Please fix this 
Comment 2 Thomas Woerner 2007-11-07 07:38:54 EST
The problem with enabling IPv6 is that postfix will try to deliver emails over
IPv6 before trying over IPv4. In consequence this would be a noticeable slowdown
in mail delivery for most current systems, which are using IPv4 only.

Please enable IPv6 if you need it for your system with "postconf -e
inet_protocols=all" and restart postfix afterwards.

I am sorry, but I have to defer this for now.
Comment 3 David Woodhouse 2007-11-14 01:47:55 EST
It shouldn't cause a noticeable slowdown at all. RFC3484 essentially says that
unless you have a global IPv6 address, you shouldn't be trying to connect to a
remote server by IPv6. And even if you do, the kernel will return failure
immediately if you have no route.

Please fix this bug.
Comment 4 Thomas Woerner 2007-11-29 09:36:44 EST
IPv6 enabled in rawhide in package postfix-2.4.6-1.fc9.

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