Common
Path MTU Discovery
Computer network protocol to determine the maximum size of packets to transmit
Path MTU Discovery
Path MTU Discovery (PMTUD) is a technique in computer networking for determining the maximum transmission unit (MTU) size on the network path between two Internet Protocol (IP) hosts, so that packets can be sent at the largest size without being fragmented in transit. It was defined for IPv4 in RFC 1191, which builds on the ICMP "Fragmentation Needed" error messages that routers send when a packet exceeds the MTU of the next hop. A sending host starts from the MTU of its first-hop link and lowers its estimate whenever an ICMP error reports a smaller limit along the path; IPv6 works the same way using ICMPv6 Packet Too Big messages, since its routers never fragment packets.RFC 8201 As an extension to the standard path MTU discovery, a technique called Packetization Layer Path MTU Discovery works without support from ICMP.
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