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List:       fedora-directory-users
Subject:    Re: [389-users] slapd only  listening on IPv6
From:       Gordon Messmer <yinyang () eburg ! com>
Date:       2011-01-24 0:19:45
Message-ID: 4D3CC5A1.6020405 () eburg ! com
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On 01/19/2011 06:11 AM, Ellsworth, Josh wrote:
> I am working on a test 389DS instance and yesterday it started giving me
> trouble. The admin server would not start up correctly. I think that the
> problem is because slapd is not listening on IPv4.
>
> [root@ldaptest ~]# netstat -aunt
> Active Internet connections (servers and established)
> Proto Recv-Q Send-Q Local Address Foreign Address State
...
> tcp 0 0 :::389 :::* LISTEN

That's normal and workable on a standard Linux host.  Is this a 
Debian/Ubuntu system?  They've changed the default behavior, there.

We're looking at a similar problem on the Courier MTA list.  Richard, I 
think the easy fix to this is to override the system default with 
setsockopt:

        int v6only = 0;
        if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
                       (char *)&on, sizeof(v6only)) == -1)
            perror("setsockopt IPV6_V6ONLY");

Josh, if this is Debian, you should be able to edit 
/etc/sysctl.d/bindv6only.conf and disable the change that Debian made.
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