.B ipsec
.B spigrp
.PP
.B ipsec
.B spigrp
[
.B \-\-label
label ]
af1 dst1 spi1 proto1 [ af2 dst2 spi2 proto2 [ af3 dst3 spi3 proto3 [ af4 dst4 spi4 proto4 ] ] ] 
.PP
.B ipsec
.B spigrp
[
.B \-\-label
label ]
.B \-\-said
SA1 [ SA2 [ SA3 [ SA4 ] ] ] 
.PP
.B ipsec
.B spigrp
.B \-\-help
.PP
.B ipsec
.B spigrp
.B \-\-version
.PP
.SH DESCRIPTION
.I Spigrp
groups IPSEC Security Associations (SAs) together or ungroups
previously grouped SAs.
An entry in the IPSEC extended
routing table can only point
(via a destination address, a Security Parameters Index (SPI) and
a protocol identifier) to one SA.
If more than one transform must be applied to a given type of packet,
this can be accomplished by setting up several SAs
with the same destination address but potentially different SPIs and protocols,
and grouping them with
.IR spigrp .
.PP
The SAs to be grouped,
specified by destination address (DNS name lookup, IPv4 dotted quad or IPv6 coloned hex), SPI
('0x'-prefixed hexadecimal number) and protocol ("ah", "esp", "comp" or "tun"),
are listed from the inside transform to the
outside;
in other words, the transforms are applied in
the order of the command line and removed in the reverse
order.
The resulting SA group is referred to by its first SA (by
.IR af1 ,
.IR dst1 ,
.IR spi1
it ungroups the previously-grouped set of SAs containing
the SA specified.
.PP
The \-\-label option identifies all responses from that command
invocation with a user-supplied label, provided as an argument to the
label option.  This can be helpful for debugging one invocation of the
command out of a large number.
.PP
The command form with no additional arguments lists the contents of
/proc/net/ipsec_spigrp.  The format of /proc/net/ipsec_spigrp is
discussed in ipsec_spigrp(5).
.SH EXAMPLES
.TP
.B ipsec spigrp inet gw2 0x113 tun inet gw2 0x115 esp inet gw2 0x116 ah
groups 3 SAs together, all destined for
.BR gw2 ,
but with an IPv4-in-IPv4 tunnel SA applied first with SPI
.BR 0x113 ,
then an ESP header to encrypt the packet with SPI
.BR 0x115 ,
and finally an AH header to authenticate the packet with SPI
.BR 0x116 .
.LP
.TP
.B ipsec spigrp --said tun.113@gw2 esp.115@gw2 ah.116@gw2 
groups 3 SAs together, all destined for
.BR gw2 ,
but with an IPv4-in-IPv4 tunnel SA applied first with SPI
.BR 0x113 ,
then an ESP header to encrypt the packet with SPI
.BR 0x115 ,
and finally an AH header to authenticate the packet with SPI
.BR 0x116 .
.LP
.TP
.B ipsec spigrp --said tun:233@3049:1::1 esp:235@3049:1::1 ah:236@3049:1::1 
groups 3 SAs together, all destined for
.BR 3049:1::1,
but with an IPv6-in-IPv6 tunnel SA applied first with SPI
.BR 0x233 ,
then an ESP header to encrypt the packet with SPI
.BR 0x235 ,
and finally an AH header to authenticate the packet with SPI
.BR 0x236 .
.LP
.TP
.B ipsec spigrp inet6 3049:1::1 0x233 tun inet6 3049:1::1 0x235 esp inet6 3049:1::1 0x236 ah
groups 3 SAs together, all destined for
.BR 3049:1::1,
but with an IPv6-in-IPv6 tunnel SA applied first with SPI
.BR 0x233 ,
then an ESP header to encrypt the packet with SPI
Yes, it really is limited to a maximum of four SAs,
although admittedly it's hard to see why you would need more.
.\"
.\" $Log: spigrp.8,v $
.\" Revision 1.20  2002/04/24 07:35:41  mcr
.\" Moved from ./klips/utils/spigrp.8,v
.\"
.\" Revision 1.19  2000/09/17 18:56:48  rgb
.\" Added IPCOMP support.
.\"
.\" Revision 1.18  2000/09/13 15:54:32  rgb
.\" Added Gerhard's ipv6 updates.
.\"
.\" Revision 1.17  2000/06/30 18:21:55  rgb
.\" Update SEE ALSO sections to include ipsec_version(5) and ipsec_pf_key(5)
.\" and correct FILES sections to no longer refer to /dev/ipsec which has
.\" been removed since PF_KEY does not use it.
.\"
.\" Revision 1.16  2000/06/21 16:54:57  rgb
.\" Added 'no additional args' text for listing contents of
.\" /proc/net/ipsec_* files.
.\"
.\" Revision 1.15  2000/02/14 21:08:30  rgb
.\" Added description of --said option.
.\"
.\" Revision 1.14  1999/07/19 18:47:25  henry
.\" fix slightly-misformed comments
.\"
.\" Revision 1.13  1999/04/06 04:54:39  rgb
.\" Fix/Add RCSID Id: and Log: bits to make PHMDs happy.  This includes
.\" patch shell fixes.
.\"