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Internet Protocol Security (IPSec)
Internet protocol security (IPSec) is an end-to-end security scheme for protecting IP communications by
authenticating and encrypting all packets in a communication session.
Use IPSec between hosts, between gateways, or between hosts and gateways.
IPSec is compatible with Telnet and FTP protocols. It supports two operational modes: Transport and
Tunnel.
• Transport mode — (default) Use to encrypt only the payload of the packet. Routing information is
unchanged.
• Tunnel mode — Use to encrypt the entire packet including the routing information of the IP header.
Typically used when creating virtual private networks (VPNs).
NOTE: Due to performance limitations on the control processor, You cannot enable IPSec on all
packets in a communication session.
IPSec uses the following protocols:
• Authentication Headers (AH) — Disconnected integrity and origin authentication for IP packets
• Encapsulating Security (ESP) — Confidentiality, authentication, and data integrity for IP packets
• Security Associations (SA) — Necessary algorithmic parameters for AH and ESP functionality
IPSec supports the following authentication and encryption algorithms:
• Authentication only:
– MD5
– SHA1
• Encryption only:
– 3DES
– CBC
– DES
• ESP Authentication and Encryption:
– MD5 & 3DES
– MD5 & CBC
– MD5 & DES
– SHA1 & 3DES
– SHA1 & CBC
– SHA1 & DES
Internet Protocol Security (IPSec)
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