How to distinguish IP packets?

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Nikname_non_name2019-10-15 20:34:19

Computer networks

Nikname_non_name, 2019-10-15 20:34:19

Hello!
Is it possible to distinguish an IPSec protocol packet (or openvpn, etc.) from an https (or ftps or ftpes, etc.) packet?! If yes, how to do it and what is needed? Help, please, without ignore!!!

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2 answer(s)

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Wexter, 2019-10-15
@Wexter

It is possible, it is determined by the packet header. Why are you doing this and why?

C

CityCat4, 2019-10-16
@CityCat4

Yes, fly. What you call IPSec is actually a family of IPSec protocols and uses different technologies.
- Establishing a tunnel - ISAKMP, IKE - port 500, 4500
- Working tunnel - protocol ESP, AH (numbers 50 and 51, respectively)
To prevent the tunnel from working, it is enough to block the indicated protocols (ports on IKE can be set to any, if agreed with both parties)