From: Choon, Raymond () (rchoon@xxxxxxx)
Date: Tue Feb 06 2001 - 15:22:46 GMT-3
Routers don't reassemble packets. Host B receives packets with MTU of 375
bytes and host B will reassemble packets to 1500 bytes because this is the
original MTU from host A.
I do not have any references for that. This is from my memory when I ran
into doing troubleshooting before. Correct me if I'm wrong.
Raymond Choon
-----Original Message-----
From: Tariq Sharif [mailto:tariq_sharif@btinternet.com]
Sent: Tuesday, February 06, 2001 1:01 PM
To: Ccielab@Groupstudy. Com
Subject: Fragmentation Concepts
Need some help on understanding IP fragmentation. In the setup below, are
the steps below correct?
LAN A |
|
Host A_| Serial line 1 Serial line 2
| LAN B
|______e0 R1 s0-------------------s0 R2
s1---------------------------s0 R3 e0 -----------|
|
|
|
|-------Host B
Host A sends 1500 bytes long packet to e0 of R1 (destined for Host B).
R1 s0 has MTU set to 750 bytes. So R1 fragments packet into 2.
R2 has MTU of 375 bytes on s1, R2 fragments packet into 2
R3 has MTU of 1500 on Ethernet LAN B, so it reassembles the fragments into
one 1500 byte long packet & hands it to Host B??
Any references to sites/books will be greatly appreciated.
Many thanks & regards.
Tariq Sharif
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