blank.gif (43 bytes)

Church Of The
Swimming Elephant

Search:
5.3.13.6 Timestamp Option Connected: An Internet Encyclopedia
5.3.13.6 Timestamp Option

Up: Connected: An Internet Encyclopedia
Up: Requests For Comments
Up: RFC 1812
Up: 5. INTERNET LAYER - FORWARDING
Up: 5.3 SPECIFIC ISSUES
Up: 5.3.13 IP Options
Prev: 5.3.13.5 Record Route Option
Next: 6. TRANSPORT LAYER

5.3.13.6 Timestamp Option

5.3.13.6 Timestamp Option

Routers MUST support the timestamp option in forwarded packets. A timestamp value MUST follow the rules given [INTRO:2].

If the flags field = 3 (timestamp and prespecified address), the router MUST add its timestamp if the next prespecified address matches any of the router's IP addresses. It is not necessary that the prespecified address be either the address of the interface on which the packet arrived or the address of the interface over which it will be sent.

IMPLEMENTATION

To maximize the utility of the timestamps contained in the timestamp option, it is suggested that the timestamp inserted be, as nearly as practical, the time at which the packet arrived at the router. For datagrams originated by the router, the timestamp inserted should be, as nearly as practical, the time at which the datagram was passed to the network layer for transmission.

A router MAY provide a configuration option which, if enabled, will cause the router to ignore (i.e., pass through unchanged) Timestamp options in forwarded datagrams when the flag word is set to zero (timestamps only) or one (timestamp and registering IP address). If provided, such an option MUST default to off (that is, the router does not ignore the timestamp). This option should not affect the processing of Timestamp options in datagrams received by the router itself (in particular, a router will insert timestamps into Timestamp options in datagrams received by the router, and Timestamp options in ICMP echo requests will still be processed according to Section [4.3.3.6]).

DISCUSSION

Like the Record Route option, the Timestamp option can reveal information about a network's topology. Some people consider this to be a security concern.


Next: 6. TRANSPORT LAYER

Connected: An Internet Encyclopedia
5.3.13.6 Timestamp Option

Cotse.Net

Protect yourself from cyberstalkers, identity thieves, and those who would snoop on you.
Stop spam from invading your inbox without losing the mail you want. We give you more control over your e-mail than any other service.
Block popups, ads, and malicious scripts while you surf the net through our anonymous proxies.
Participate in Usenet, host your web files, easily send anonymous messages, and more, much more.
All private, all encrypted, all secure, all in an easy to use service, and all for only $5.95 a month!

Service Details

 
.
www.cotse.com
Have you gone to church today?
.
All pages ©1999, 2000, 2001, 2002, 2003 Church of the Swimming Elephant unless otherwise stated
Church of the Swimming Elephant©1999, 2000, 2001, 2002, 2003 Cotse.com.
Cotse.com is a wholly owned subsidiary of Packetderm, LLC.

Packetderm, LLC
210 Park Ave #308
Worcester, MA 01609