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List:       opensmtpd-misc
Subject:    Re: listening to both inet4 and 6
From:       Stéphane Guedon <stephane () 22decembre ! eu>
Date:       2014-04-02 8:41:11
Message-ID: 1816819.dI56tARgm0 () luciole
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Le samedi 15 mars 2014 20:19:47, vous avez écrit :
> hello
> 
> I have a problem regarding listening on inet4 and 6.
> 
> My interface has several address (one ipv4 and several ipv6).
> I need to restrain listening on the inet4, otherwise smtpd complains
> somebody's already listening at the same place (obviously himself).
> 
> Someone has an idea why ?

I solved this problem !

The damn thing was that my interface (re0 in that case) has had 
several time the same address (twice or three...). So of course smtpd 
identify somebody already listening already on the address... I hope 
everybody understand. This is definitely weird !

here is the result of ifconfig to show what I mean :

root@blackblock:~:# ifconfig    re0              
re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr bc:5f:f4:73:a7:e0
        priority: 0
        groups: egress
        media: Ethernet autoselect (1000baseT full-
duplex,rxpause,txpause)
        status: active
        inet6 fe80::be5f:f4ff:fe73:a7e0%re0 prefixlen 64 scopeid 0x1
        inet6 2001:16d8:dd00:8207::2 prefixlen 64
        inet6 2001:16d8:dd00:8207:be5f:f4ff:fe73:a7e0 prefixlen 64
        inet6 2001:16d8:dd00:8207:be5f:f4ff:fe73:a7e0 prefixlen 64
        inet6 2001:16d8:dd00:8207:be5f:f4ff:fe73:a7e0 prefixlen 64
        inet6 2001:16d8:dd00:8207:a07f:ebc0:589c:edd0 prefixlen 64 
autoconf autoconfprivacy pltime 78809 vltime 597701
        inet 192.168.87.2 netmask 0xffffff00 broadcast 192.168.87.255


as you can see, there is three times the same autoconf address 
(2001:16d8:dd00:8207:be5f:f4ff:fe73:a7e0).
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