MTU Fragmentation Calculator - Analyze Network Packet Fragmentation

Network Configuration

Network Type

MTU Size (bytes) Minimum: 68, Maximum: 65535

Protocol Stack

📦

IPv4 + TCP

20 + 20 bytes

💨

IPv4 + UDP

20 + 8 bytes

🌐

IPv6 + TCP

40 + 20 bytes

⚡

IPv6 + UDP

40 + 8 bytes

Additional Headers

VLAN Tag (L2 - doesn't affect IP MTU) MPLS Label (L2.5 - doesn't affect IP MTU) GRE Tunnel (reduces effective MTU) IPSec ESP (reduces effective MTU)

Payload Size (bytes) Size of data to transmit

Don't Fragment (DF) Bit

How IP Fragmentation Works:
• IP header is repeated in each fragment
• Transport header (TCP/UDP) only in first fragment
• Fragment offsets are in 8-byte units
• All fragments except last must be 8-byte aligned

Fragmentation Analysis

Max Payload

Total Fragments

Total Overhead

Efficiency

Fragment Distribution

Common MTU Sizes Reference

Ethernet 1500 bytes

PPPoE DSL 1492 bytes

VPN Tunnel 1400 bytes

Jumbo Frames 9000 bytes

Network Configuration

Fragmentation Analysis

Fragment Distribution

Fragment Breakdown

Common MTU Sizes Reference

Path MTU Discovery Simulation