The problem with MTU <1500

Mon Mar 26 14:00:59 UTC 2012

Dear all!
I have two different values of uplink MTU - 1440 and 1492.
And in a local network - 1500.
In Cisco routers can be set 'set ip df 0', but I have no such router :(
What options are there for FreeBSD?
Only use the net/tcpmssd?
Will it be possible to process both two channels of 1Gb?

-- 
Vladislav V. Prodan            
System & Network Administrator 
http://support.od.ua           
+380 67 4584408, +380 99 4060508
VVP88-RIPE