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| Linux Forum Index » Linux Networking » Stream Identifier Option in RFC 791... |
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| Bhaktavatsalam Nallanthighal... |
 Posted: Sat Sep 26, 2009 11:20 am |
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Guest
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Hi,
Under the options of RFC 791, there is a Stream Identifier
option. The length is given as 4. But, the binary is given as 0000010,
which is 2. Is this a mistake or is there some wizardry associated?
Bhaktavatsalam Nallanthighal
bhaktavatsalam.n at (no spam) gmail.com |
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| Lew Pitcher... |
| Posted: Sat Sep 26, 2009 4:41 pm |
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Guest
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On September 26, 2009 17:20, in comp.os.linux.networking, Bhaktavatsalam
Nallanthighal (bhaktavatsalam.n at (no spam) gmail.com) wrote:
Quote: Hi,
Under the options of RFC 791, there is a Stream Identifier
option. The length is given as 4. But, the binary is given as 0000010,
which is 2. Is this a mistake or is there some wizardry associated?
It is a mistake, and is noted in the Errata for RFC791
( http://www.rfc-editor.org/errata_search.php?rfc=791 )
where it says:
Section 3.1 says:
+--------+--------+--------+--------+
|10001000|00000010| Stream ID |
+--------+--------+--------+--------+
Type=136 Length=4
It should say:
+--------+--------+--------+--------+
|10001000|00000100| Stream ID |
+--------+--------+--------+--------+
Type=136 Length=4
Rationale:
This number count the length which is 4 and not 2.
10 in binary is 2 in decimal, 100 in binary is 4 in decimal.
The option-length octet counts the option-type octet and the
option-length octet as well as the option-data octets.(see page 15)
The length is 4 for the Stream identifier option as we have 4 bytes and
it is well written in page 16 of RFC 791:
....
--
Lew Pitcher
Master Codewright & JOAT-in-training | Registered Linux User #112576
http://pitcher.digitalfreehold.ca/ | GPG public key available by request
---------- Slackware - Because I know what I'm doing. ------ |
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