IPFW questions (log fragments, ipfw show)

[Sebastian Schwarz]

On 2018-05-02, Beat Siegenthaler wrote:
> ipfw show:
> 63000     56    28136 Wed May  2 22:51:43 2018 allow udp from any to me6
> 53,123 recv gif0 keep-state :default
>
> what says ":default" at the end? Only on rules with keep-alive. I do not
> remember to see this some months ago.

This is the flow name.  If not explicitly specified it is
":default".  The change was released with 11.1:

- https://www.freebsd.org/releases/11.1R/relnotes.html#kernel-modules
- https://svnweb.freebsd.org/base?view=revision&revision=316274
- https://reviews.freebsd.org/D6674