MTU table#
| Network type | MTU | Notes |
| Maximum MTU | 65535 | Maximum theoretical MTU defined in RFC1191 document |
| Hyperchannel | 65535 | - |
| 16Mbit/s IBM Token Ring | 17914 | - |
| IEEE 802.4 | 8166 | - |
| WLAN (802.11) | 7981 | - |
| IEEE 802.5 (4Mbit/s) | 4464 | - |
| FDDI | 4352 | - |
| Wideband Network | 2048 | - |
| IEEE 802.5 (4Mbit/s) | 2002 | - |
| Experimental Ethernet | 1536 | - |
| Ethernet | 1500 | - |
| Point-to-Point | 1500 | - |
| IEEE 802.3 | 1492 | - |
| SLIP | 1006 | - |
| ARPANET | 1006 | - |
| X.26 network | 576 | - |
| DEC IP Portal | 544 | - |
| NETBIOS | 512 | - |
| IEEE 802/Source-Route Bridge | 508 | - |
| ARCNET | 508 | - |
| Point-to-Point (low-delay) | 296 | - |
| Internet IPv4 | Vary on network configuration. Minimum possible value is 68 bytes | |
| Internet IPv6 | Vary on network configuration. Minimum possible value is 1280 bytes | |
| Minimal MTU | 68 | Minimal possible MTU defined in RFC1191 document |
Some facts#
- MTU is a maximum number of payload bytes in datagram.
- MTU determines maximum datagram size, which can be transmitted without fragmentation. Attempt to send more data than defined MTU number, causes division of the original message into smaller pieces. Size of each piece is less or equal to MTU.
- Greater MTU values allow to use bandwith more efficiently (less overhead), but causes network to be less resistant to transmit errors. This is why optimal MTU depends on environment and network conditions.
- MTU value range (min/max) is often defined by the protocol being used. For example: The typical Ethernet Frame payload valid size is 46 - 1500 bytes (octets).
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