HP-UX IPSec version A.02.01 Administrator's Guide

Interoperability
Linux
Appendix B242
right=192.12.13.7
rightnexthop=192.12.13.1
auto=add
compress=no
auth=esp
authby=secret
pfs=no
esp=3des-sha1-96
NOTE compress and pfs must both be set to no in the Linux FreeSWAN
configuration. HP-UX IPSec does not support IP compression or PFS for
keys only.