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@TrickyDicky thanks for your reply, the question of whether or not a IP fragmentation is necessary?
If you design a ipsec device, if the path MTU is 1514, and the incoming ip packet is 1514, because we need add another ip header in tunnel mode, so if we don't do the fragmenation, the packet...
Thanks dpaul, yes, they are mostly handled by high level protocal, but in some cases, the router or other layer 3 device will split an ip packet into two or multiple, so you need to reassemble the packet that to do the filter and later action, in another case, if you split a encrypt ip packet...
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