Transport-Related Protocol-Design Issues - Lars Eggert
Transport-Related Protocol-Design Issues - Lars Eggert
Transport-Related Protocol-Design Issues - Lars Eggert
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lide title<br />
40 pt<br />
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24 pt<br />
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24 pt<br />
level 2-5<br />
20 pt<br />
Integrity<br />
Remember: not all link layers have checksums<br />
TCP, UDP and DCCP use a ones’ complement checksum<br />
– Can detect errors introduced in between the end-points, and<br />
things that were missed by link layer checksums<br />
– Quite weak, 16 bit ones-complement sum<br />
<strong>Protocol</strong>s that require stronger protection from errors<br />
should use stronger integrity protection inside the protocol<br />
– Especially if lacking synchronization point in protocol messages<br />
SCTP uses a 32-bit CRC<br />
– OK for most uses<br />
Transfer of larger data objects over any transport should<br />
be verified<br />
IETF-73, Minneapolis, MN, USA WG Chairs Training Lunch 13<br />
November 19, 2008<br />
Top right<br />
corner fo<br />
field-mar<br />
customer<br />
partner lo<br />
See Best<br />
for exam
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