| TCP option 2, Maximum Segment Size |
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Description | Glossary | RFCs | Publications | Obsolete RFCs |
| Protocol suite: | TCP/IP. |
| Protocol type: | Transport layer protocol. |
| Option length: | 4 bytes. |
| Host implementation: | |
| Router implementation: | |
| Links: | IANA: TCP option numbers. |
The TCP Maximum Segment Size option can be used to specify the maximum segment size that the receiver should use.
| MAC header | IP header | TCP header | TCP option 2 | Data |
TCP Option 2:
| 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
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| Kind | Length | Maximum Segment Size | |||||||||||||||||||||||||||||
Kind. 8 bits. Set to 2.
Length. 8 bits. Set to 4.
Maximum Segment Size.
16 bits.
This field must only be sent in the initial connection request (i.e., in segments with the SYN control bit set).
If this option is not used, any segment size is allowed.
RFCs:
[RFC 793] Transmission Control Protocol.
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Description | Glossary | RFCs | Publications | Obsolete RFCs |