As a transparent bump-in-the-wire, GWLB itself does not fragment or reassemble packets. GWLB forwards UDP fragments to/from target appliances. However, GWLB drops TCP and ICMP fragments because layer 4 header is not present in these fragments. In addition, if the target appliance converts original incoming packet into fragments and sends the newly created fragments back to GWLB, GWLB drops these newly created fragments because they don’t contain layer 4 header. To prevent fragmentation from occurring on the target appliance, we recommend enabling jumbo frame on your target appliance or setting your target appliance’s network interface to use the maximum desired MTU, thus achieving transparent forwarding behavior by keeping the original packet contents as is.