1This module matches the parameters in Authentication header of IPsec packets.
2.TP
3[\fB!\fP] \fB\-\-ahspi\fP \fIspi\fP[\fB:\fP\fIspi\fP]
4Matches SPI.
5.TP
6[\fB!\fP] \fB\-\-ahlen\fP \fIlength\fP
7Total length of this header in octets.
8.TP
9\fB\-\-ahres\fP
10Matches if the reserved field is filled with zero.
11