2/15/2023 0 Comments Tcp mss fortigate![]() ![]() ![]() ![]() IPv4 fragmentation breaks a datagram into pieces that are reassembled later. The receiving station is responsible for the reassembly of the fragments into the original, full size IPv4 datagram. The design of IPv4 accommodates MTU differences because it allows routers to fragment IPv4 datagrams as necessary. The MTU value depends on the transmission link. IPv4 Fragmentation and ReassemblyĪlthough the maximum length of an IPv4 datagram is 65535, most transmission links enforce a smaller maximum packet length limit, called an MTU. This document describes how IPv4 Fragmentation and Path Maximum Transmission Unit Discovery (PMTUD) work and also discusses scenarios that involve the behavior of PMTUD when combined with different combinations of IPv4 tunnels. ![]()
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