IPsec Settings
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• ESP is a protocol for carrying out encrypted communication using IPsec. ESP encrypts the payload
(communicated contents) and adds additional information. The IP packet is comprised of the header and
the encrypted payload, which follows the header. In addition to the encrypted data, the IP packet also
includes information regarding the encryption method and encryption key, the authentication data, and so
on.
• AH is part of the IPsec protocol that authenticates the sender and prevents manipulation of the data
(ensures the completeness of the data). In the IP packet, the data is inserted immediately after the header.
In addition, the packets include hash values, which are calculated using an equation from the
communicated contents, secret key, and so on, in order to prevent the falsification of the sender and
manipulation of the data. Unlike ESP, the communicated contents are not encrypted, and the data is sent
and received as plain text.
• Encryption
(If Custom is selected in Use Prefixed Template) Select DES, 3DES, AES-CBC 128, or
AES-CBC 256. The encryption can be selected only when ESP is selected in Protocol. If IKEv2
is selected in IKE, multiple selections are possible.
(If a setting other than Custom is selected in Use Prefixed Template) The above-mentioned
enabled encryption will be displayed.
• Hash
(If Custom is selected in Use Prefixed Template, and IKEv1 or Manual is selected in IKE) Select
None, MD5, SHA1, SHA256, or SHA512. None can be selected only when ESP is selected in
Protocol.
(If Custom is selected in Use Prefixed Template, and IKEv2 is selected in IKE) Select MD5,
SHA1, SHA256, or SHA512. Multiple selections are possible.
(If a setting other than Custom is selected in Use Prefixed Template) The above-mentioned
enabled hash algorithm type will be displayed.
• SA Lifetime
Specify the IKE SA lifetime.
(If Custom is selected in Use Prefixed Template, and IKEv1 or IKEv2 is selected in IKE) Enter
the time (seconds) and number of kilobytes (KByte).
(If a setting other than Custom is selected in Use Prefixed Template) The time (seconds) and
number of kilobytes (KByte) will be displayed.
• Encapsulation Mode
Select Transport or Tunnel.
• Remote Router IP-Address
Specify the IP address (IPv4 or IPv6) of the connection destination. Enter only when the Tunnel
mode is selected.
SA (Security Association) is an encrypted communication method using IPsec or IPv6 that exchanges and
shares information, such as the encryption method and encryption key, in order to establish a secure
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