[Openswan Users] Cisco IPSec incompatibility

[mehrunes dagon]

interop.html bundled inside openswan ver 2.4.7 says

"Cisco VPN Client appears to use nonstandard IPsec and does not work with FreeS/WAN. This message concerns Cisco VPN Client 4.01." 

the suggested link to august 2003 archive is dead. august 2003 archive is unavailable.

in fact, all links in cisco section of interop.html are dead

i am greatly interested in Cisco hardware and software incompatibility and compatibility. Where do i find info about it?