I've got a livebox at a site that needs to have an IPSec site-to-site vpn back into the head office. I can't figure out how to forward / bridge all ipsec (ESP, UDP 500) traffic to the vpn router that I have sitting behind the livebox LAN.
What is the correct way to pass through ipsec traffic (or all traffic if need be) from the livebox to the vpn router. The livebox can't be replaced with another device as unfortunately the site uses its voip functionality.