PF weirdness

[Kristof Provost]

On 17 Aug 2016, at 11:24, mail+lists at m.jwh.me.uk wrote:
> Ok so, I have an ERL that just does PPPoE and NAT via PF, however it 
> seems
> to be modifying the packets passing through the nat filter such that
> traceroutes end up like this:
>
> C:\Users\jwh>tracert -d -w 1 8.8.8.8
>
> Tracing route to 8.8.8.8 over a maximum of 30 hops
>
>   1     5 ms     1 ms     1 ms  172.21.88.254
>   2    47 ms    40 ms    39 ms  8.8.8.8
>   3    40 ms     *       39 ms  8.8.8.8
>   4    37 ms    25 ms    67 ms  8.8.8.8

That’s PR 201519.
I’m looking into it, but right now I have no idea why it happens.
It seems to be fine on head (and likely also on 11), and I don’t see 
any obvious differences in pf that could cause this.

Regards,
Kristof