1 - added dead peer detection which checks aliveness of remote peer if no
2 IKE or ESP traffic is received. Support for dpdaction, dpddelay???
4 - Added support for leftprotoport/rightprotoport parameters in IKEv2. IKEv2
5 would offer more possibilities for traffic selection, but the Linux kernel
6 currently does not support it. That's why we stick with these simple
7 ipsec.conf rules for now.
9 - Initial NAT traversal support in IKEv2. Charon includes NAT detection
10 notify payloads to detect NAT routers between the peers. It switches
11 to port 4500, uses UDP encapsulated ESP packets, handles peer address
12 changes gracefully and sends keep alive message periodically.
14 - Reimplemented IKE_SA state machine for charon, which allows simultaneous
15 rekeying, more shared code, cleaner design, proper retransmission
16 and a more extensible code base.
21 - The mixed PSK/RSA roadwarrior detection capability introduced by the
22 strongswan-2.7.0 release necessitated the pre-parsing of the IKE proposal
23 payloads by the responder right before any defined IKE Main Mode state had
24 been established. Although any form of bad proposal syntax was being correctly
25 detected by the payload parser, the subsequent error handler didn't check
26 the state pointer before logging current state information, causing an
27 immediate crash of the pluto keying daemon due to a NULL pointer.
32 - Added algorithm selection to charon: New default algorithms for
33 ike=aes128-sha-modp2048, as both daemons support it. The default
34 for IPsec SAs is now esp=aes128-sha,3des-md5. charon handles
35 the ike/esp parameter the same way as pluto. As this syntax does
36 not allow specification of a pseudo random function, the same
37 algorithm as for integrity is used (currently sha/md5). Supported
39 Encryption: aes128, aes192, aes256
40 Integrity/PRF: md5, sha (using hmac)
41 DH-Groups: modp768, 1024, 1536, 2048, 4096, 8192
43 Encryption: aes128, aes192, aes256, 3des, blowfish128,
44 blowfish192, blowfish256
46 More IKE encryption algorithms will come after porting libcrypto into
49 - initial support for rekeying CHILD_SAs using IKEv2. Currently no
50 perfect forward secrecy is used. The rekeying parameters rekey,
51 rekeymargin, rekeyfuzz and keylife from ipsec.conf are now supported
52 when using IKEv2. WARNING: charon currently is unable to handle
53 simultaneous rekeying. To avoid such a situation, use a large
54 rekeyfuzz, or even better, set rekey=no on one peer.
56 - support for host2host, net2net, host2net (roadwarrior) tunnels
57 using predefined RSA certificates (see uml scenarios for
58 configuration examples).
60 - new build environment featuring autotools. Features such
61 as HTTP, LDAP and smartcard support may be enabled using
62 the ./configure script. Changing install directories
63 is possible, too. See ./configure --help for more details.
65 - better integration of charon with ipsec starter, which allows
66 (almost) transparent operation with both daemons. charon
67 handles ipsec commands up, down, status, statusall, listall,
68 listcerts and allows proper load, reload and delete of connections
74 - initial support of the IKEv2 protocol. Connections in
75 ipsec.conf designated by keyexchange=ikev2 are negotiated
76 by the new IKEv2 charon keying daemon whereas those marked
77 by keyexchange=ikev1 or the default keyexchange=ike are
78 handled thy the IKEv1 pluto keying daemon. Currently only
79 a limited subset of functions are available with IKEv2
80 (Default AES encryption, authentication based on locally
81 imported X.509 certificates, unencrypted private RSA keys
82 in PKCS#1 file format, limited functionality of the ipsec
89 - the dynamic iptables rules from the _updown_x509 template
90 for KLIPS and the _updown_policy template for NETKEY have
91 been merged into the default _updown script. The existing
92 left|rightfirewall keyword causes the automatic insertion
93 and deletion of ACCEPT rules for tunneled traffic upon
94 the successful setup and teardown of an IPsec SA, respectively.
95 left|rightfirwall can be used with KLIPS under any Linux 2.4
96 kernel or with NETKEY under a Linux kernel version >= 2.6.16
97 in conjuction with iptables >= 1.3.5. For NETKEY under a Linux
98 kernel version < 2.6.16 which does not support IPsec policy
99 matching yet, please continue to use a copy of the _updown_espmark
100 template loaded via the left|rightupdown keyword.
102 - a new left|righthostaccess keyword has been introduced which
103 can be used in conjunction with left|rightfirewall and the
104 default _updown script. By default leftfirewall=yes inserts
105 a bi-directional iptables FORWARD rule for a local client network
106 with a netmask different from 255.255.255.255 (single host).
107 This does not allow to access the VPN gateway host via its
108 internal network interface which is part of the client subnet
109 because an iptables INPUT and OUTPUT rule would be required.
110 lefthostaccess=yes will cause this additional ACCEPT rules to
113 - mixed PSK|RSA roadwarriors are now supported. The ISAKMP proposal
114 payload is preparsed in order to find out whether the roadwarrior
115 requests PSK or RSA so that a matching connection candidate can
122 - the new _updown_policy template allows ipsec policy based
123 iptables firewall rules. Required are iptables version
124 >= 1.3.5 and linux kernel >= 2.6.16. This script obsoletes
125 the _updown_espmark template, so that no INPUT mangle rules
126 are required any more.
128 - added support of DPD restart mode
130 - ipsec starter now allows the use of wildcards in include
131 statements as e.g. in "include /etc/my_ipsec/*.conf".
132 Patch courtesy of Matthias Haas.
134 - the Netscape OID 'employeeNumber' is now recognized and can be
135 used as a Relative Distinguished Name in certificates.
141 - /etc/init.d/ipsec or /etc/rc.d/ipsec is now a copy of the ipsec
142 command and not of ipsec setup any more.
144 - ipsec starter now supports AH authentication in conjunction with
145 ESP encryption. AH authentication is configured in ipsec.conf
146 via the auth=ah parameter.
148 - The command ipsec scencrypt|scdecrypt <args> is now an alias for
149 ipsec whack --scencrypt|scdecrypt <args>.
151 - get_sa_info() now determines for the native netkey IPsec stack
152 the exact time of the last use of an active eroute. This information
153 is used by the Dead Peer Detection algorithm and is also displayed by
154 the ipsec status command.
160 - running under the native Linux 2.6 IPsec stack, the function
161 get_sa_info() is called by ipsec auto --status to display the current
162 number of transmitted bytes per IPsec SA.
164 - get_sa_info() is also used by the Dead Peer Detection process to detect
165 recent ESP activity. If ESP traffic was received from the peer within
166 the last dpd_delay interval then no R_Y_THERE notification must be sent.
168 - strongSwan now supports the Relative Distinguished Name "unstructuredName"
169 in ID_DER_ASN1_DN identities. The following notations are possible:
171 rightid="unstructuredName=John Doe"
172 rightid="UN=John Doe"
174 - fixed a long-standing bug which caused PSK-based roadwarrior connections
175 to segfault in the function id.c:same_id() called by keys.c:get_secret()
176 if an FQDN, USER_FQDN, or Key ID was defined, as in the following example.
183 - the ipsec command now supports most ipsec auto commands (e.g. ipsec listall).
185 - ipsec starter didn't set host_addr and client.addr ports in whack msg.
187 - in order to guarantee backwards-compatibility with the script-based
188 auto function (e.g. auto --replace), the ipsec starter scripts stores
189 the defaultroute information in the temporary file /var/run/ipsec.info.
191 - The compile-time option USE_XAUTH_VID enables the sending of the XAUTH
192 Vendor ID which is expected by Cisco PIX 7 boxes that act as IKE Mode Config
195 - the ipsec starter now also recognizes the parameters authby=never and
196 type=passthrough|pass|drop|reject.
202 - ipsec starter now supports the also parameter which allows
203 a modular structure of the connection definitions. Thus
204 "ipsec start" is now ready to replace "ipsec setup".
210 - Mathieu Lafon's popular ipsec starter tool has been added to the
211 strongSwan distribution. Many thanks go to Stephan Scholz from astaro
212 for his integration work. ipsec starter is a C program which is going
213 to replace the various shell and awk starter scripts (setup, _plutoload,
214 _plutostart, _realsetup, _startklips, _confread, and auto). Since
215 ipsec.conf is now parsed only once, the starting of multiple tunnels is
216 accelerated tremedously.
218 - Added support of %defaultroute to the ipsec starter. If the IP address
219 changes, a HUP signal to the ipsec starter will automatically
220 reload pluto's connections.
222 - moved most compile time configurations from pluto/Makefile to
223 Makefile.inc by defining the options USE_LIBCURL, USE_LDAP,
224 USE_SMARTCARD, and USE_NAT_TRAVERSAL_TRANSPORT_MODE.
226 - removed the ipsec verify and ipsec newhostkey commands
228 - fixed some 64-bit issues in formatted print statements
230 - The scepclient functionality implementing the Simple Certificate
231 Enrollment Protocol (SCEP) is nearly complete but hasn't been
238 - CA certicates are now automatically loaded from a smartcard
239 or USB crypto token and appear in the ipsec auto --listcacerts
246 - when using "ipsec whack --scencrypt <data>" with a PKCS#11
247 library that does not support the C_Encrypt() Cryptoki
248 function (e.g. OpenSC), the RSA encryption is done in
249 software using the public key fetched from the smartcard.
251 - The scepclient function now allows to define the
252 validity of a self-signed certificate using the --days,
253 --startdate, and --enddate options. The default validity
254 has been changed from one year to five years.
260 - the config setup parameter pkcs11proxy=yes opens pluto's PKCS#11
261 interface to other applications for RSA encryption and decryption
262 via the whack interface. Notation:
264 ipsec whack --scencrypt <data>
265 [--inbase 16|hex|64|base64|256|text|ascii]
266 [--outbase 16|hex|64|base64|256|text|ascii]
269 ipsec whack --scdecrypt <data>
270 [--inbase 16|hex|64|base64|256|text|ascii]
271 [--outbase 16|hex|64|base64|256|text|ascii]
274 The default setting for inbase and outbase is hex.
276 The new proxy interface can be used for securing symmetric
277 encryption keys required by the cryptoloop or dm-crypt
278 disk encryption schemes, especially in the case when
279 pkcs11keepstate=yes causes pluto to lock the pkcs11 slot
282 - if the file /etc/ipsec.secrets is lacking during the startup of
283 pluto then the root-readable file /etc/ipsec.d/private/myKey.der
284 containing a 2048 bit RSA private key and a matching self-signed
285 certificate stored in the file /etc/ipsec.d/certs/selfCert.der
286 is automatically generated by calling the function
288 ipsec scepclient --out pkcs1 --out cert-self
290 scepclient was written by Jan Hutter and Martin Willi, students
291 at the University of Applied Sciences in Rapperswil, Switzerland.
297 - the current extension of the PKCS#7 framework introduced
298 a parsing error in PKCS#7 wrapped X.509 certificates that are
299 e.g. transmitted by Windows XP when multi-level CAs are used.
300 the parsing syntax has been fixed.
302 - added a patch by Gerald Richter which tolerates multiple occurrences
303 of the ipsec0 interface when using KLIPS.
309 - with gawk-3.1.4 the word "default2 has become a protected
310 keyword for use in switch statements and cannot be used any
311 more in the strongSwan scripts. This problem has been
312 solved by renaming "default" to "defaults" and "setdefault"
313 in the scripts _confread and auto, respectively.
315 - introduced the parameter leftsendcert with the values
317 always|yes (the default, always send a cert)
318 ifasked (send the cert only upon a cert request)
319 never|no (never send a cert, used for raw RSA keys and
322 - fixed the initialization of the ESP key length to a default of
323 128 bits in the case that the peer does not send a key length
324 attribute for AES encryption.
326 - applied Herbert Xu's uniqueIDs patch
328 - applied Herbert Xu's CLOEXEC patches
334 - CRLs can now be cached also in the case when the issuer's
335 certificate does not contain a subjectKeyIdentifier field.
336 In that case the subjectKeyIdentifier is computed by pluto as the
337 160 bit SHA-1 hash of the issuer's public key in compliance
338 with section 4.2.1.2 of RFC 3280.
340 - Fixed a bug introduced by strongswan-2.5.1 which eliminated
341 not only multiple Quick Modes of a given connection but also
342 multiple connections between two security gateways.
348 - Under the native IPsec of the Linux 2.6 kernel, a %trap eroute
349 installed either by setting auto=route in ipsec.conf or by
350 a connection put into hold, generates an XFRM_AQUIRE event
351 for each packet that wants to use the not-yet exisiting
352 tunnel. Up to now each XFRM_AQUIRE event led to an entry in
353 the Quick Mode queue, causing multiple IPsec SA to be
354 established in rapid succession. Starting with strongswan-2.5.1
355 only a single IPsec SA is established per host-pair connection.
357 - Right after loading the PKCS#11 module, all smartcard slots are
358 searched for certificates. The result can be viewed using
361 ipsec auto --listcards
363 The certificate objects found in the slots are numbered
364 starting with #1, #2, etc. This position number can be used to address
365 certificates (leftcert=%smartcard) and keys (: PIN %smartcard)
366 in ipsec.conf and ipsec.secrets, respectively:
368 %smartcard (selects object #1)
369 %smartcard#1 (selects object #1)
370 %smartcard#3 (selects object #3)
372 As an alternative the existing retrieval scheme can be used:
374 %smartcard:45 (selects object with id=45)
375 %smartcard0 (selects first object in slot 0)
376 %smartcard4:45 (selects object in slot 4 with id=45)
378 - Depending on the settings of CKA_SIGN and CKA_DECRYPT
379 private key flags either C_Sign() or C_Decrypt() is used
380 to generate a signature.
382 - The output buffer length parameter siglen in C_Sign()
383 is now initialized to the actual size of the output
384 buffer prior to the function call. This fixes the
385 CKR_BUFFER_TOO_SMALL error that could occur when using
386 the OpenSC PKCS#11 module.
388 - Changed the initialization of the PKCS#11 CK_MECHANISM in
389 C_SignInit() to mech = { CKM_RSA_PKCS, NULL_PTR, 0 }.
391 - Refactored the RSA public/private key code and transferred it
392 from keys.c to the new pkcs1.c file as a preparatory step
393 towards the release of the SCEP client.
399 - The loading of a PKCS#11 smartcard library module during
400 runtime does not require OpenSC library functions any more
401 because the corresponding code has been integrated into
402 smartcard.c. Also the RSAREF pkcs11 header files have been
403 included in a newly created pluto/rsaref directory so that
404 no external include path has to be defined any longer.
406 - A long-awaited feature has been implemented at last:
407 The local caching of CRLs fetched via HTTP or LDAP, activated
408 by the parameter cachecrls=yes in the config setup section
409 of ipsec.conf. The dynamically fetched CRLs are stored under
410 a unique file name containing the issuer's subjectKeyID
411 in /etc/ipsec.d/crls.
413 - Applied a one-line patch courtesy of Michael Richardson
414 from the Openswan project which fixes the kernel-oops
415 in KLIPS when an snmp daemon is running on the same box.
421 - Eliminated null length CRL distribution point strings.
423 - Fixed a trust path evaluation bug introduced with 2.4.3
429 - Improved the joint OCSP / CRL revocation policy.
430 OCSP responses have precedence over CRL entries.
432 - Introduced support of CRLv2 reason codes.
434 - Fixed a bug with key-pad equipped readers which caused
435 pluto to prompt for the pin via the console when the first
436 occasion to enter the pin via the key-pad was missed.
438 - When pluto is built with LDAP_V3 enabled, the library
439 liblber required by newer versions of openldap is now
446 - Added the _updown_espmark template which requires all
447 incoming ESP traffic to be marked with a default mark
450 - Introduced the pkcs11keepstate parameter in the config setup
451 section of ipsec.conf. With pkcs11keepstate=yes the PKCS#11
452 session and login states are kept as long as possible during
453 the lifetime of pluto. This means that a PIN entry via a key
454 pad has to be done only once.
456 - Introduced the pkcs11module parameter in the config setup
457 section of ipsec.conf which specifies the PKCS#11 module
458 to be used with smart cards. Example:
460 pkcs11module=/usr/lib/pkcs11/opensc-pkcs11.lo
462 - Added support of smartcard readers equipped with a PIN pad.
464 - Added patch by Jay Pfeifer which detects when netkey
465 modules have been statically built into the Linux 2.6 kernel.
467 - Added two patches by Herbert Xu. The first uses ip xfrm
468 instead of setkey to flush the IPsec policy database. The
469 second sets the optional flag in inbound IPComp SAs only.
471 - Applied Ulrich Weber's patch which fixes an interoperability
472 problem between native IPsec and KLIPS systems caused by
473 setting the replay window to 32 instead of 0 for ipcomp.
479 - Fixed a bug which caused an unwanted Mode Config request
480 to be initiated in the case where "right" was used to denote
481 the local side in ipsec.conf and "left" the remote side,
482 contrary to the recommendation that "right" be remote and
489 - updated Vendor ID to strongSwan-2.4.0
491 - updated copyright statement to include David Buechi and
498 - strongSwan now communicates with attached smartcards and
499 USB crypto tokens via the standardized PKCS #11 interface.
500 By default the OpenSC library from www.opensc.org is used
501 but any other PKCS#11 library could be dynamically linked.
502 strongSwan's PKCS#11 API was implemented by David Buechi
503 and Michael Meier, both graduates of the Zurich University
504 of Applied Sciences in Winterthur, Switzerland.
506 - When a %trap eroute is triggered by an outgoing IP packet
507 then the native IPsec stack of the Linux 2.6 kernel [often/
508 always?] returns an XFRM_ACQUIRE message with an undefined
509 protocol family field and the connection setup fails.
510 As a workaround IPv4 (AF_INET) is now assumed.
512 - the results of the UML test scenarios are now enhanced
513 with block diagrams of the virtual network topology used
514 in a particular test.
520 - fixed IV used to decrypt informational messages.
521 This bug was introduced with Mode Config functionality.
523 - fixed NCP Vendor ID.
525 - undid one of Ulrich Weber's maximum udp size patches
526 because it caused a segmentation fault with NAT-ed
529 - added UML scenarios wildcards and attr-cert which
530 demonstrate the implementation of IPsec policies based
531 on wildcard parameters contained in Distinguished Names and
532 on X.509 attribute certificates, respectively.
538 - Added basic Mode Config functionality
540 - Added Mathieu Lafon's patch which upgrades the status of
541 the NAT-Traversal implementation to RFC 3947.
543 - The _startklips script now also loads the xfrm4_tunnel
546 - Added Ulrich Weber's netlink replay window size and
547 maximum udp size patches.
549 - UML testing now uses the Linux 2.6.10 UML kernel by default.
555 - Eric Marchionni and Patrik Rayo, both recent graduates from
556 the Zuercher Hochschule Winterthur in Switzerland, created a
557 User-Mode-Linux test setup for strongSwan. For more details
558 please read the INSTALL and README documents in the testing
561 - Full support of group attributes based on X.509 attribute
562 certificates. Attribute certificates can be generated
563 using the openac facility. For more details see
567 The group attributes can be used in connection definitions
568 in order to give IPsec access to specific user groups.
569 This is done with the new parameter left|rightgroups as in
571 rightgroups="Research, Sales"
573 giving access to users possessing the group attributes
574 Research or Sales, only.
576 - In Quick Mode clients with subnet mask /32 are now
577 coded as IP_V4_ADDRESS or IP_V6_ADDRESS. This should
578 fix rekeying problems with the SafeNet/SoftRemote and NCP
579 Secure Entry Clients.
581 - Changed the defaults of the ikelifetime and keylife parameters
582 to 3h and 1h, respectively. The maximum allowable values are
583 now both set to 24 h.
585 - Suppressed notification wars between two IPsec peers that
586 could e.g. be triggered by incorrect ISAKMP encryption.
588 - Public RSA keys can now have identical IDs if either the
589 issuing CA or the serial number is different. The serial
590 number of a certificate is now shown by the command
592 ipsec auto --listpubkeys
598 - Added Tuomo Soini's sourceip feature which allows a strongSwan
599 roadwarrior to use a fixed Virtual IP (see README section 2.6)
600 and reduces the well-known four tunnel case on VPN gateways to
601 a single tunnel definition (see README section 2.4).
603 - Fixed a bug occuring with NAT-Traversal enabled when the responder
604 suddenly turns initiator and the initiator cannot find a matching
605 connection because of the floated IKE port 4500.
607 - Removed misleading ipsec verify command from barf.
609 - Running under the native IP stack, ipsec --version now shows
610 the Linux kernel version (courtesy to the Openswan project).
616 - Introduced the ipsec auto --listalgs monitoring command which lists
617 all currently registered IKE and ESP algorithms.
619 - Fixed a bug in the ESP algorithm selection occuring when the strict flag
620 is set and the first proposed transform does not match.
622 - Fixed another deadlock in the use of the lock_certs_and_keys() mutex,
623 occuring when a smartcard is present.
625 - Prevented that a superseded Phase1 state can trigger a DPD_TIMEOUT event.
627 - Fixed the printing of the notification names (null)
629 - Applied another of Herbert Xu's Netlink patches.
635 - Support of Dead Peer Detection. The connection parameter
639 activates DPD for the given connection.
641 - The default Opportunistic Encryption (OE) policy groups are not
642 automatically included anymore. Those wishing to activate OE can include
643 the policy group with the following statement in ipsec.conf:
645 include /etc/ipsec.d/examples/oe.conf
647 The default for [right|left]rsasigkey is now set to %cert.
649 - strongSwan now has a Vendor ID of its own which can be activated
650 using the compile option VENDORID
652 - Applied Herbert Xu's patch which sets the compression algorithm correctly.
654 - Applied Herbert Xu's patch fixing an ESPINUDP problem
656 - Applied Herbert Xu's patch setting source/destination port numbers.
658 - Reapplied one of Herbert Xu's NAT-Traversal patches which got
659 lost during the migration from SuperFreeS/WAN.
661 - Fixed a deadlock in the use of the lock_certs_and_keys() mutex.
663 - Fixed the unsharing of alg parameters when instantiating group
670 - Thomas Walpuski made me aware of a potential DoS attack via
671 a PKCS#7-wrapped certificate bundle which could overwrite valid CA
672 certificates in Pluto's authority certificate store. This vulnerability
673 was fixed by establishing trust in CA candidate certificates up to a
674 trusted root CA prior to insertion into Pluto's chained list.
676 - replaced the --assign option by the -v option in the auto awk script
677 in order to make it run with mawk under debian/woody.
683 - Split of the status information between ipsec auto --status (concise)
684 and ipsec auto --statusall (verbose). Both commands can be used with
685 an optional connection selector:
687 ipsec auto --status[all] <connection_name>
689 - Added the description of X.509 related features to the ipsec_auto(8)
692 - Hardened the ASN.1 parser in debug mode, especially the printing
693 of malformed distinguished names.
695 - The size of an RSA public key received in a certificate is now restricted to
697 512 bits <= modulus length <= 8192 bits.
699 - Fixed the debug mode enumeration.
705 - Fixed another PKCS#7 vulnerability which could lead to an
706 endless loop while following the X.509 trust chain.
712 - Fixed the PKCS#7 vulnerability discovered by Thomas Walpuski
713 that accepted end certificates having identical issuer and subject
714 distinguished names in a multi-tier X.509 trust chain.
720 - Removed all remaining references to ipsec_netlink.h in KLIPS.
726 - The new "ca" section allows to define the following parameters:
729 cacert=koolCA.pem # cacert of kool CA
730 ocspuri=http://ocsp.kool.net:8001 # ocsp server
731 ldapserver=ldap.kool.net # default ldap server
732 crluri=http://www.kool.net/kool.crl # crl distribution point
733 crluri2="ldap:///O=Kool, C= .." # crl distribution point #2
734 auto=add # add, ignore
736 The ca definitions can be monitored via the command
738 ipsec auto --listcainfos
740 - Fixed cosmetic corruption of /proc filesystem by integrating
741 D. Hugh Redelmeier's freeswan-2.06 kernel fixes.
747 - Added support for the 818043 NAT-Traversal update of Microsoft's
748 Windows 2000/XP IPsec client which sends an ID_FQDN during Quick Mode.
750 - A symbolic link to libcrypto is now added in the kernel sources
751 during kernel compilation
753 - Fixed a couple of 64 bit issues (mostly casts to int).
754 Thanks to Ken Bantoft who checked my sources on a 64 bit platform.
756 - Replaced s[n]printf() statements in the kernel by ipsec_snprintf().
757 Credits go to D. Hugh Redelmeier, Michael Richardson, and Sam Sgro
758 of the FreeS/WAN team who solved this problem with the 2.4.25 kernel.
764 - an empty ASN.1 SEQUENCE OF or SET OF object (e.g. a subjectAltName
765 certificate extension which contains no generalName item) can cause
766 a pluto crash. This bug has been fixed. Additionally the ASN.1 parser has
767 been hardened to make it more robust against malformed ASN.1 objects.
769 - applied Herbert Xu's NAT-T patches which fixes NAT-T under the native
770 Linux 2.6 IPsec stack.
776 - based on freeswan-2.04, x509-1.5.3, nat-0.6c, alg-0.8.1rc12