Path MTU Discovery when routing over IPSec connections

Hi!

I have this equal problem with two TSL2.2 as Ipsec tunnel.

http://groups.google.it/group/fa.freebsd.hackers/browse_thread/thread/d7258b5591917043/e6bef4a7d19364c2?lnk=st&q=unreachable++need+to+frag+mtu+ipsec+patch&rnum=6&hl=it#e6bef4a7d19364c2

http://groups.google.it/group/comp.os.linux.networking/browse_thread/thread/db4333a09ccab9b2/3fd7ec5bcd84ce30?lnk=st&q=unreachable++need+to+frag+mtu+ipsec+patch&rnum=4&hl=it#3fd7ec5bcd84ce30

http://groups.google.it/group/fa.freebsd.bugs/browse_thread/thread/8f6b21e72abff5a8/84ac66344bd6204d?lnk=st&q=unreachable++need+to+frag+mtu&rnum=12&hl=it#84ac66344bd6204d

Is there a patch or solution?

Thanks!