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If Layer 4 TPDU go into Layer 3 then it is fragmented into two pieces (packets).

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Jim

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Jun 11, 1998, 3:00:00 AM6/11/98
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If Layer 4 TPDU go into Layer 3 then it is fragmented into two pieces
(packets).
Are there layer 4 header in both of two layer 3 packets ?
I mean layer 4 harder may be only in the first packet then
the second packet is not found layer 4 header.

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Jim ( Liu Jiun-Ji ) Email : jj...@cs.nchu.edu.tw
Home Page : http://www.cs.nchu.edu.tw/~jjliu/
Institute of Computer Science National Chung-Hsing University
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Real programmers uses C++ -- Smart developers uses Delphi
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Jim

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Jun 11, 1998, 3:00:00 AM6/11/98
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Barry Margolin

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Jun 11, 1998, 3:00:00 AM6/11/98
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In article <6lovdf$bs7$1...@news.nchu.edu.tw>, Jim <jj...@cs.nchu.edu.tw> wrote:
>If Layer 4 TPDU go into Layer 3 then it is fragmented into two pieces
>(packets).
>Are there layer 4 header in both of two layer 3 packets ?
>I mean layer 4 harder may be only in the first packet then
>the second packet is not found layer 4 header.

There needs to be enough of the L4 header so that all the fragments that
are part of the L4 TPDU's can be recognized and reassembled. In IP, all
the fragments of an IP datagram contain the complete IP header, although
they have different values in the fragment offset field and the Last
Fragment flag, of course. Other protocol suites can do things differently.

--
Barry Margolin, bar...@bbnplanet.com
GTE Internetworking, Powered by BBN, Cambridge, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.

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