IPV6 TCP6 Slow Connect

[Kristof Provost]

On 2016-02-10 20:38:02 (-0600), Larry Rosenman <ler at lerctr.org> wrote:
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206904
> 
> I've also posted lots of info to freebsd-net, and not gotten any 
> response.
> 
> Summary:
> 
> Cable Modem-> EM0 on a pfSense Firewall (FreeBSD 10.1, pfSense 2.2.6)
>                set to dhcp6, and ask for a /56 prefix
> 
> EM1->LAN, set to track interface, prefix id 0, radvd running advertising 
> the 00 /64
> LAN-> borg.lerctr.org using lagg0, SLAAC (rtsold).  Gets an address, 
> icmp6 works, tcp6 times out.
>      -> win10 SLAAC, tcp6 works fine, as does icmp6.
> 
For this I'd start by taking packet captures of both the FreeBSD tcp6
connection and the win10 tcp6 connection. Finding the difference between
the two will likely go a long way in finding the cause.

Regards,
Kristof