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ipsecesp(4p)

ipsecesp(4P)                   Network Protocols                  ipsecesp(4P)

NAME
       ipsecesp, ESP - IPsec Encapsulating Security Payload

DESCRIPTION
       The  ipsecesp  module  provides confidentiality, integrity, authentica‐
       tion, and partial sequence integrity (replay protection)  to  IP  data‐
       grams.  The encapsulating security payload (ESP) encapsulates its data,
       enabling it to protect data that follows in the datagram. For TCP pack‐
       ets, ESP encapsulates the TCP header and its data only. If  the  packet
       is an IP in IP datagram, ESP protects the inner IP datagram. Per-socket
       policy  allows  "self-encapsulation"  so ESP can encapsulate IP options
       when necessary. See ipsec(4P).


       Unlike the authentication header (AH), ESP allows multiple varieties of
       datagram protection. (Using a single datagram protection form  can  ex‐
       pose  vulnerabilities.)  For  example,  only ESP can be used to provide
       confidentiality. But protecting confidentiality alone exposes  vulnera‐
       bilities  in  both replay attacks and cut-and-paste attacks. Similarly,
       if ESP protects only integrity  and  does  not  fully  protect  against
       eavesdropping,   it   may   provide  weaker  protection  than  AH.  See
       ipsecah(4P).

   ESP Device
       ESP is implemented as a module that is auto-pushed on top  of  IP.  Use
       the /dev/ipsecesp entry to tune ESP with ndd(8).

   Algorithms
       ESP uses encryption and authentication algorithms. Authentication algo‐
       rithms  include  HMAC-MD5 and HMAC-SHA-1. Encryption algorithms include
       DES, Triple-DES, Blowfish and AES. Each authentication  and  encryption
       algorithm  contain key size and key format properties. You can obtain a
       list of authentication and encryption algorithms and  their  properties
       by  using  the ipsecalgs(8) command. You can also use the functions de‐
       scribed in the getipsecalgbyname(3C) man page to retrieve  the  proper‐
       ties of algorithms.

   Security Considerations
       ESP  without  authentication  exposes  vulnerabilities to cut-and-paste
       cryptographic attacks as well as eavesdropping attacks. Like AH, ESP is
       vulnerable to eavesdropping when used without confidentiality.

ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE  TYPEAT‐
       TRIBUTE VALUE _ Availabilitysystem/core-os _ Interface StabilityCommit‐
       ted


SEE ALSO
       getipsecalgbyname(3C),  ip(4P),  ipsec(4P), ipsecah(4P), attributes(7),
       ipsecalgs(8), ipsecconf(8), ndd(8)

       Kent, S. and Atkinson, R., RFC 2406, IP Encapsulating Security Payload
       (ESP), The Internet Society, 1998.

           https://tools.ietf.org/html/rfc2406


Oracle Solaris 11.4               21 Jun 2021                     ipsecesp(4P)
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