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If you have multiple domains pointing to the same IP address, can you see which domain a packet was sent to?

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Application-layer protocols such as HTTP generally have this capability.

At the network layer, no, you can't tell.

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  • Note that the server name reported at the application layer is not necessarily the one actually used to resolve the server's IP address. For example, both curl --resolve and openssl s_client -servername can be used to "fake" the server name at the application layer. – Gordon Davisson Jun 12 at 1:17

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