Need two flowgrindd instances for IPv4 and IPv6 under FreeBSD

[Lars Eggert]

I need to start two flowgrindd instances on FreeBSD. The first instance is only binding to an IPV6 socket:

root@five:~ # flowgrindd
root@five:~ # sockstat | grep flow
root flowgrindd 47727 3 dgram -> /var/run/logpriv
root flowgrindd 47727 6 tcp6 *:5999 *:*

The second instance is then binding to an IPv4 socket:

root@five:~ # flowgrindd
root@five:~ # sockstat | grep flow
root flowgrindd 47731 3 dgram -> /var/run/logpriv
root flowgrindd 47731 6 tcp4 *:5999 *:*
root flowgrindd 47727 3 dgram -> /var/run/logpriv
root flowgrindd 47727 6 tcp6 *:5999 *:*

Why doesn't the first instance bind to both IPv4 and IPv6?

[Christian Samsel (oxygenx)]

This ist the expected and correct behaviour on FreeBSD. It binds exactly one address and FreeBSD prefers v6 over v4. You can change the binding address with -b.

[Lars Eggert (lars-g)]

On Oct 15, 2013, at 14:11, Christian Samsel <email address hidden> wrote:
> This ist the expected and correct behaviour on FreeBSD. It binds exactly
> one address and FreeBSD prefers v6 over v4.

So then the second bind() should throw an error rather than silently binding to v4.

Lars