| implementation | encapsulation mode | hash | cipther | authentication | protocol | group | ip |
|---|---|---|---|---|---|---|---|
| isakmpd | tunnel/transport | md5,sha,ripemd | des,3des,cast,blf,aes | pre shared key / x509 | esp / ah | grp1, grp2, grp5 | 4 / 6 |
openbsd
ipsec_tunnel patch
Linux Kernel 2.5/2.6 using OpenBSD's isakmpd