É a coisa foi feia mesmo, 3 dias depois do lançamento da 3.12 já saiu a 3.13.
What's new in 3.13:
*) hotspot - fixed dst-nat for SMTP (broken in 3.11);
*) dhcp client - added support for DHCP option 121 (classless route);
*) fixed simple queues - changing simple queues could lock up i386 routers
*) routing-test - added support for multiple recursive nexthops;
*) routing-test - fixed BGP AS number byteorder, broken in 3.12;