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What I have learnt is that whenever protocol X is encapsulated inside another protocol Y, then we say protocol X over protocol Y. eg: we say video over http or text over http, that's because video/text payload is inside of the http protocol. But when people say Ipsec over GRE or GRE over IPsec, i find it interpreted in ambiguous ways.

Can someone please tell me if I am correct?

  1. Ipsec over GRE means: IPSEC packet is encapsulated in GRE packet.
  2. GRE over IPSEC means: GRE packet is encapsulated in Ipsec packet.

If I am wrong then why it this different than the example i presented above i.e video/text over http.

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Generally, 'X over Y' means protocol X is transported/encapsulated/tunneled over protocol Y. Y is the outer protocol and X is the payload. There's no ambiguity here.

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  • Conclusion: the OP was correct Commented Feb 11 at 9:33
  • Thankyou! for clearing this up Commented Feb 11 at 9:48

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