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Traffic Monitor displays packets larger than 1360 bytes, despite exceeding max MTU size

Traffic Monitor displays packets larger than 1360 bytes, despite exceeding max MTU size

Packets larger than 1360 bytes may be fragmented on the way to Onomondo PGW, but displayed in the Monitor as single packets.

Jakub Kubinski avatar
Written by Jakub Kubinski
Updated over a week ago

Environment

  • Onomondo app: Traffic Monitor

  • Onomondo Core Network

Question

  • Traffic Monitor displays packets larger than 1360 bytes, despite them exceeding max MTU size of 1360 bytes. Why?

  • Can I successfully send packets larger than 1360 bytes?

Answer

It depends.

  • Packets larger than 1360 bytes may be fragmented on the way to Onomondo Packet Gateway (PGW), depending on your device settings.

  • The reassembled packets will be displayed in the Traffic Monitor as single packets.

We cannot fully guarantee the delivery of packets larger than 1360 bytes due to the MTU size limit on the Onomondo network.

Cause

  • The fragmentation occurs on IP level and is irrelevant of the transmission protocol (TCP / UDP).

  • The fragmentation occurs before reaching Onomondo Packet Gateway (PGW) and is the reassembled and reported as a single packet.

  • Whether the fragmentation occurs depends on your device.

    • If the fragmentation is enabled in the IP header - packets may be fragmented.

    • If the fragmentation is disabled (IP flag set to: "Don't fragment") - packets larger than 1360 bytes might be dropped by the Onomondo network and their delivery cannot be guaranteed.

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