Fragment : 2nd Ques

Hi

Again ; trying to understand Fragmentation .
Lets have following scenario :

R1 --------R2 ------------R3 ----R4

R1-R2 MTU = 3300 bytes
R2-R3 MTU = 1300 bytes
R3-R4 MTU = 3300 bytes

Let pkt of 12000 byte came in R1 . It fragments and send on R1-R2 link

R2 must fragment each of these into smaller fragments to send them over the
1,300-byte MTU link. Note that the R3 does *not* reassemble the
1,300-byte fragments, even though next link has an MTU of 3,300
bytes.WHYYYYYY ????

My question is that why is re-assembly done by end router ? Reasons ?

Thnx
Happy

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Received on Tue Sep 21 2010 - 11:03:37 ART