| BOOTP / DHCP option 38, TCP keepalive interval |
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Description | Glossary | RFCs | Publications | Obsolete RFCs |
| Protocol suite: | TCP/IP. |
| Protocol type: | Application layer configuration protocol. |
| Base protocols: |
BOOTP, Bootstrap Protocol. DHCP, Dynamic Host Configuration Protocol. |
| Option length: | 6 bytes. |
| Links: | IANA: BOOTP and DHCP options. |
This option specifies the interval that the client TCP should wait before sending a keepalive message on a TCP connection.
| MAC header | IP header | UDP header | BOOTP | DHCP header | BOOTP / DHCP option 38 |
BOOTP / DHCP option 38:
| 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Code | Length | ||||||||||||||
| Interval - | |||||||||||||||
Code.
8 bits.
Always set to 38.
Option code.
Length.
8 bits.
Always set to 4.
Size of the option data in bytes.
Interval.
32 bits, unsigned.
Interval in seconds.
Clearing the interval to zero indicates that the client should not generate keepalive messages on connections unless specifically requested by an application.
RFCs:
[RFC 2132] DHCP Options and BOOTP Vendor Extensions.
[RFC 1533] DHCP Options and BOOTP Vendor Extensions.
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Description | Glossary | RFCs | Publications | Obsolete RFCs |