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What's the maximum size of MTU on Onomondo network?

Onomondo supports max. MTU of 1360 for regular traffic and 1280 for VPN connections.

Written by Jakub Kubinski

Environment

  • Onomondo Core Network

  • Device: applicable to all

Question

  • What's the maximum size of MTU on Onomondo network?

  • What MTU should I set?

  • Does Onomondo support jumbo frames on its network?

Answer

Onomondo supports max. MTU of:

  • 1360 bytes for regular traffic*,

  • 1280 bytes for VPN connections.

*Jumbo frames" are not supported.

* This includes TCP/IP headers.

Cause

When encapsulating packets, Onomondo adds an extra overhead to make sure they are routed correctly. The 140 bytes of deviation between 1360 bytes and the widely-adopted standard MTU of 1500 is meant to accommodate for extra headers.

Jumbo frames only really make sense if you are on a LAN. As soon as you go to the internet (or through a VPN routed over the internet) you need to fragment the frames, and at that point it is more reliable to just use smaller frames, as you can't resend a partial frame if a fragment is lost in transit.
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