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THE FEUTEX TOOLKIT

TCP MSS Through a Tunnel

Calculate inner TCP payload capacity after specified tunnel and option overhead.

Networking workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
Formulapayload=outerMTU−tunnel−innerIP−TCP
Sources and model references

How to use this tool

  1. Enter the labeled inputs in the indicated units.
  2. Calculate and compare every output against the stated model assumptions.

Try this example

{
  "mtu": 1500,
  "tunnel": 60,
  "ip": 20,
  "tcp": 32
}

Accuracy and scope

User-supplied fixed overhead; no nested fragmentation, variable encapsulation or PMTU discovery. Simplified analytical model; not a design recommendation or safety certification.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.