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question regarding routing

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wajahat

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Hi all,
i have a question regarding routing.Is it possible for an intermediate router to identify which ack corresponds to which packet it forwarded previoulsy.

Thankin you in anticipation.

regards
wajahat hussain
 

No, I do not think so. I think that the router forward the ACK without knowing any additional information because the router main functionality is in layer-3 and the ACKs are in layer-4.
Does that make sense?

Added after 1 minutes:

I mean that the sequence number and the ACK number are in the header of TCP which is in layer-4 that the router can not read.
 

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