Firepower 1140 is dropping packets bigger than 1362 bytes

[johnchrapkowski]

Working with my colo provider, they’re telling me my firepower is dropping packets that are larger than 1362 bytes. They showed me some juniper logs that seem to validate this. Also if I ping with packets larger, the ping fails but if I do smaller packets, it will ping fine.  I’ve tried reducing mtu sizes on every device and the provider has as well. The 1140 has no configure

terminal

command so I can’t get to certain commands. Anyone know where to start?

[MHM Cisco World · Accepted solution]

from FMC 
interface -> edit -> then change the MTU 

MHM

[johnchrapkowski]

Thank  you!