MTU / MSS Calculator
Model encapsulation stacks, Ethernet wire cost and practical TCP MSS commands for common platforms.
Runs locally in your browser
PATH MTU
Path MTU / MSS
Start with the outer IP MTU and subtract up to 16 ordered encapsulation layers.
Path result
1500
No encapsulation layers. Add one or calculate the base MTU.
ETHERNET L2
Ethernet / L2 on-wire
Add headers, tags, labels, FCS, preamble/SFD and inter-frame gap to an IP payload.
Frame and wire result
L2
Add headers, tags, labels, FCS, preamble/SFD and inter-frame gap to an IP payload.