[ntp:questions] ipv6 support on linux - bind problem

Maurice Janssen mauricej at xs4all.nl
Sat Apr 7 19:33:52 UTC 2007

On Sat, 07 Apr 2007 11:14:04 -0700, Wolfgang S. Rupprecht wrote:
>I've seen this problem with other programs under linux's ipv6.  The
>problem is that the linux stack unlike the Kame stack used in BSD's
>uses mapped ipv4 addresses in ipv6.  If one opens up a whildcard
>listening socket for both the ipv4 stack (with AF_INET) and then again
>for the ipv6 stack (with AF_INET6), one ends up trying to open the v4
>port a second time through the mapped-address.  The trick is to only
>open up the AF_INET6 socket - it implies the ipv4 mapping.

Another option:
echo 1 > /proc/sys/net/ipv6/bindv6only


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