man/man7p/ipsecah.7p

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 ipsecah 7P "25 Sep 2009" "SunOS 5.11" "Protocols"
 NAME
ipsecah, AH - IPsec Authentication Header
 SYNOPSIS

drv/ipsecah


 DESCRIPTION

The ipsecah module (AH) provides strong integrity, authentication,
and partial sequence integrity (replay protection) to IP datagrams.
AH protects the parts of the IP datagram that can be predicted by
the sender as it will be received by the receiver. For example, the IP
TTL field is not a predictable field, and is not protected by AH.

AH is inserted between the IP header and the transport header. The
transport header can be TCP, UDP, ICMP, or another IP
header, if tunnels are being used.
 "AH Device"

AH is implemented as a module that is auto-pushed on top of IP. The entry
/dev/ipsecah is used for tuning AH with ndd(1M).
 "Authentication Algorithms"

Current authentication algorithms supported include HMAC-MD5 and HMAC-SHA-1.
Each authentication algorithm has its own key size and key format properties.
You can obtain a list of authentication algorithms and their properties by
using the ipsecalgs(1M) command. You can also use the functions described
in the getipsecalgbyname(3NSL) man page to retrieve the properties of
algorithms.
 "Security Considerations"

Without replay protection enabled, AH is vulnerable to replay attacks.
AH does not protect against eavesdropping. Data protected with AH
can still be seen by an adversary.
 ATTRIBUTES

See attributes(5) for descriptions of the following attributes:


ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityCommitted


 SEE ALSO

ipsecalgs(1M), ipsecconf(1M), ndd(1M), attributes(5),
getipsecalgbyname(3NSL), ip(7P), ipsec(7P),
ipsecesp(7P)

Kent, S. and Atkinson, R.RFC 2402, IP Authentication Header, The Internet
Society, 1998.