MTU/MSS Calculator

Calculate MTU/MSS considering protocol overhead at each layer. Automatically computes header sizes for IPv4/IPv6, TCP/UDP, IPsec, GRE, VXLAN, PPPoE, WireGuard, and more to determine optimal MTU and payload (MSS) values

Base MTU

Ethernet (1500)Jumbo Frame (9000)PPPoE (1492)IPv6 Minimum (1280)IPv4 Minimum (576)

Overhead Options

Network Layer

IPv4 Header (20B)IPv6 Header (40B)

Transport Layer

TCP Header (20B)UDP Header (8B)

Tunnel/VPN

IPsec ESP (Transport) (73B)IPsec ESP (Tunnel) (93B)GRE (24B)VXLAN (50B)WireGuard (60B)

Encapsulation

PPPoE (8B)MPLS (1 label) (4B)IEEE 802.1Q VLAN (4B)

Base MTU

1500

bytes

Total Overhead

bytes

Effective Payload (MSS)

1460

bytes

Overhead Breakdown

IPv4 Header

20 bytes

TCP Header

20 bytes

Total Overhead40 bytes

Packet Diagram

Payload 1460B

01500 bytes

Common Configuration Presets

Standard Ethernet + IPv4 + TCPPPPoE + IPv4 + TCPWireGuard VPNVXLAN OverlayGRE TunnelIPv6 + TCP