I have three IOS routers in different sites all interconnected via OSPF over GRE over IPSec. It's working perfectly. One of the routers at one of the sites is getting overloaded due to the IPSec, so I want to replace it with a PIX running 7.2 code.
The PIX doesn't support GRE so I have to re-think how this is all setup and I'm looking for suggestions. I'm not sure if I should get rid of GRE across the board and just do OSPF over IPSec (I'm not sure if IOS can do straight OSPF over IPSec without a tunnel of some sort, but it appears PIX 7.2 can) or what my options are here.
Any thoughts welcome.