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The TCP timestamp option provides better TCP round-trip time measurements. Because the timestamps are always sent and echoed in both directions and the timestamp value in the header is always changing, TCP header compression will not compress the outgoing packet. To allow TCP header compression over a serial link, the TCP timestamp option is disabled.
Refer to RFC 1323 for more detailed information on TCP timestamp.
This feature is supported on these platforms:
To enable TCP timestamp, perform the following task in global configuration mode:
| Task | Command |
|---|---|
| Enable TCP timestamp. | ip tcp timestamp |
If you want to use TCP header compression over a serial line, TCP timestamp and TCP selective acknowledgment must be disabled. Both features are disabled by default. To disable TCP selective acknowledgment once it is enabled, refer to the "TCP Selective Acknowledgment" chapter.
The following example enables the router to send TCP timestamps:
ip tcp timestamp
The new ip tcp timestamp command controls TCP timestamp.
To enable TCP timestamp, use the ip tcp timestamp global configuration command. To disable TCP timestamp, use the no form of this command.
ip tcp timestampThis command has no arguments or keywords.
Disabled
Global configuration
This command first appeared in Cisco IOS Release 11.2 F.
TCP timestamp improves round-trip time estimates. Refer to RFC 1323 for more detailed information on TCP timestamp.
This feature must be disabled if you want to use TCP header compression.
The following example enables the router to send TCP timestamps:
ip tcp timestamp
ip tcp header-compression
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