MTU/Path MTU/Black Hole-All you need to know



NOTE:-Layer 2 switch cannot fragmenr ip header information-Layer3
if it gets packets more than MTU then it will drop the packets.



Path MTU Discovery:   TYPE-3 CODE-4
=============


PC1(1500)------>(1500)Router(500)------------->(1500)PC2


black hole:TYPE-3 CODE-4
======================


PC(1500,1460)------>(1500,1460)R1(1500,1460)------------->(1500,1476)R2(1500)---------PC2
<-------------------dest-unreachable-frag needed-------
destination unreachable fragmentation needed packet capture:-

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