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MTU and MSS Calculator
Versioned overhead table for VLAN, PPPoE, GRE, VXLAN, WireGuard, IPsec.
68-65535; the overhead table version ships with every result.
Overhead
0 B
Inner IP payload
1480 B
TCP MSS
1460 B
UDP payload max
1472 B
Bare IP on the wire.
Inner IPv4 header (20 B) + TCP header (20 B) are subtracted for MSS; every layer states its own byte cost above.
Done
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