reaction on ICMP 3 4

From: Volkov, Dmitry (IDS Canada) (dmitry_volkov@ca.ml.com)
Date: Sun Jun 29 2003 - 18:09:10 GMT-3

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How TCP/IP stack reacts on receiving ICMP type 3 code 4 Fragmentation needed
but DF set ?
I mean how many bytes will be sent next time after receiving ICMP
unreachable.
I lowered IP mtu to 1420 and router sent ICMP and host started send 1420 !!
I sniffed ICMP packed and I didn't see anything inside ICMP indicating
allowable MTU.
How source knows what size frame to retransmit ?
 
Thanks,
Dmitry

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