The Goal is fragmentation of large IP packets and jumbo frames (up to 9000Bytes) to normal size IP packets (MTU <=1500Bytes).
A PC ) directly connected to Ether3 is sending ICMP packets to a PC directly connected to Ether4.
Routing is set on both ends
No firewalling rule or NAT applied
The issue at hand:
All is working fine when packet size is smaller than 1473 Bytes For ICMP packet bigger than 1472 Bytes the packet is seen sent over the cable but dropped by the CCR MTU for the ingress is set for 3000Bytes
In addition, the CCR does not send packets with MTU bigger than 1500Bytes on ether3 even though it is set to 1600
To summarize:
“jumbo” packets do not seem to work as well as fragmentation of jumbo packets to normal size packets