Re: [PATCH] conf: Separate local mode for each IP version, don't enable disabled IP version

[Stefano Brivio <sbrivio@redhat.com>]

On Fri, 5 Dec 2025 13:00:37 +0100
Paul Holzinger <pholzing@redhat.com> wrote:

> On 05/12/2025 12:31, Stefano Brivio wrote:
> > On Fri, 5 Dec 2025 12:26:06 +0100
> > Paul Holzinger <pholzing@redhat.com> wrote:
> >  
> >> On 05/12/2025 01:51, Stefano Brivio wrote:  
> >>> This fixes an issue and introduces a feature:
> >>>
> >>> - in local mode, we accidentally ignored the -4 / --ipv4-only and
> >>>     -6 / --ipv6-only command line options
> >>>
> >>> - if no template interface is available for a given IP version,
> >>>     instead of disabling that IP version, use local mode, separately,
> >>>     for it
> >>>
> >>> Link: https://bugs.passt.top/show_bug.cgi?id=129
> >>> Link: https://bugs.passt.top/show_bug.cgi?id=128
> >>> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>  
> >> Tested-by: Paul Holzinger <pholzing@redhat.com>  
> > Ah, thanks, that's quite reassuring / much needed for this one.  
> 
> FWIW, this is how I tested:
> 
> unshare -rn  sh -c "ip link add test type bridge && ip link set test up 
> && ip addr add 192.168.0.0/24 dev test &&  ./pasta --config-net ip a"
> 
> unshare -rn  sh -c "ip link add test type bridge && ip link set test up 
> && ip addr add 2620::1/64 dev test &&  ./pasta --config-net ip a"
> 
> And then the variations with  adding -4/-6.

I went another way:

  $ ./pasta --config-net -4 -- ./pasta --config-net ip a

  $ ./pasta --config-net -6 -- ./pasta --config-net ip a

...maybe we should consider to slowly start making --config-net the default.

-- 
Stefano