ipfw3 nat to dynamic ip

[Edgar Pettijohn]

On 12/24/21 20:19, Bill Yuan wrote:
> Hi,
>
> I fully agree with you. it must be very helpful during the 
> configuration, especially in your network scenario.
>
> Maybe, you can try to implement a script to do that, update the ipfw3 
> whenever the IP changes.
>
> Regards,
> Bill Yuan
>
> On Sat, 25 Dec 2021 at 04:32, samg <samg at fastmail.com> wrote:
>
>     On Fri, Dec 24, 2021, at 10:05 AM, Edgar Pettijohn wrote:
>     > From the manual:
>     >
>     > [ifX*:net*]
>     >                      Matches the IPv4 network of the first IPv4
>     address
>     >                      assigned to the *ifX*.  It is intended to
>     help matching the
>     >                      IPv4 network of the IPv4 address assigned
>     to the *ifX*
>     >                      dynamically, e.g. by DHCP.
>
>     Thats from the ipfw manual, not the ipfw3 manual. ipfw3 doesn't
>     support that syntax in the nat config. Looking at the source, it
>     parses the ip with inet_aton, which only accepts ips in the form
>     xxx.xxx[.xxx[.xxx]]
>

Just curious if you've tried it anyway. Might be an undocumented 
feature. Or maybe you can assign an alias ip to the interface and use 
that ip for natting to.
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