[tor-relays] FreeBSD's global IP ID (was: Platform diversity in Tor network)

[grarpamp]

On Thu, Nov 6, 2014 at 8:52 AM, Philipp Winter <phw at nymity.ch> wrote:
> On Wed, Nov 05, 2014 at 04:04:41AM -0500, grarpamp wrote:
>>  173 FreeBSD
>
> FreeBSD still seems to use globally incrementing IP IDs by default.
> That's an issue as it leaks fine-grained information about how many
> packets a relay's networking stack processes.  (However, nobody
> investigated the exact impact on Tor relays so far, which makes this a
> FUD-heavy topic.) It looks like approximately 50 out of the 131 FreeBSD
> relays I tested (38%) use global IP IDs.
>
> There's a sysctl variable called "net.inet.ip.random_id" which makes a
> FreeBSD's IP ID behaviour random.  FreeBSD relay operators should set
> this to "1".
>
> Note that this issue was already discussed earlier this year in a thread
> called "Lots of tor relays send out sequential IP IDs; please fix
> that!".

It's been default off since before it was a sysctl over a decade ago.
Anyone know what the deal is with that? Some objection, or
forgotten flag day, or oversight that really should be set to 1?
https://svnweb.freebsd.org/base?view=revision&revision=133720