Understanding How SRX Series Devices Handle Packet Fragmentation for IPv6 Flows

This topic explains packet fragmentation for IP version 6 (IPv6).

For IPv4 Internet Control Message Protocol (IPv4 ICMP), if a node within the path between a source node and a destination node receives a packet that is larger than its MTU size, it can fragment the packet and transmit the resulting smaller packets. For IPv6, only a source node (the node that sent the packet) can fragment a packet, and this is done to accommodate a path MTU size-adjustment requirement. Nodes along the path of a packet cannot fragment the packet to transmit it.