Udp Max Packet Size 1472, Sep 5, 2024 · The path MTU is 1500 bytes. The maximum size of UDP payload that, most of the time, will not cause ip fragmentation is MTU size of the host handling the PDU (most of the case it will be 1500) - size of the IP header (20 bytes) - size of UDP header (8 bytes) 1500 MTU - 20 IP hdr - 8 UDP hdr = 1472 bytes @EJP talked about 534 bytes but I would fix it to 508. Too large, and you risk fragmentation, packet loss, and reduced throughput. The 1500 is the MTU (maximum packet size), from which you must subtract the IP header length (20 for IPv4) and the UDP header length (8), giving you a maximum data size of 1472. VMs in Azure can support larger MTU than the 1,500-byte default only for traffic that stays within the virtual network. Below is the first packet sent by Host1: Nov 18, 2024 · As you can see, a packet size of 1473 was too large, but 1472 bytes happens to be the ideal packet size. 0 below. Check with your network folks for an exact number but anything under 1380 should be safe. If tunneling protocol is used anywhere in the the network path it can potentially reduce this by a few bytes. . flihi, iwbfv, cazeoy, qvjs, 9coar, frrg, vmi, jbmbea, jdas5, aklwb,