Where does the esp header go after the ip header?

Asked by Rylee Santiago on Dec 05, 2021 Go

The ESP header is inserted after the IP header and before the next layer protocol header (transport mode) or before an encapsulated IP header (tunnel mode). These modes are described in more detail below.
Just so, where does the ESP header go in a network?
For more details on how to use ESP and AH in various network environments, see the Security Architecture document [ Ken-Arch ]. The ESP header is inserted after the IP header and before the next layer protocol header (transport mode) or before an encapsulated IP header (tunnel mode). These modes are described in more detail below.
Similarly, why is ESP used in host to host architecture? Because transport mode cannot alter the original IP header or create a new IP header, transport mode is generally used in host-to-host architectures. ESP is the second core IPSec security protocol. In the initial version of IPSec, ESP provided only encryption for packet payload data.
Thereof, what is the purpose of the new IP header?
The new IP header lists the endpoints of the ESP tunnel (such as two IPSec gateways) as the source and destination of the packet. Because of this, tunnel mode can be used with all three VPN architecture models. The purpose of the Internet Key Exchange (IKE) protocol is to negotiate, create, and manage security associations.
Additionally, where does the value 50 go in ESP header?
Encapsulating Security Payload Packet Format The (outer) protocol header (IPv4, IPv6, or Extension) that immediately precedes the ESP header SHALL contain the value 50 in its Protocol (IPv4) or Next Header (IPv6, Extension) field (see IANA web page at http://www.iana.org/assignments/protocol-numbers ).

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