I'm trying to connect Cisco routers behind XG firewalls via an IPSec tunnel and overlay that a GRE tunnel so as to use a routing protocol (example EIGRP, OSPF, etc).
Design would look something like this with ETH0 being connected to internal LAN and ETH1 connected to MPLS provider. Overlay that a GRE tunnel and force that out the XS appliances.
Have been working with support. Can ping icmp traffic across router Tunnel12 but cant' get the tunnels to come UP on the Cisco routers. This is because XG's won't forward GRE traffic--simply can't.
I've been told only GRE support is limited to XG to XG traffic and have been referenced https://community.sophos.com/kb/en-us/123290. Have been given https://community.sophos.com/kb/en-us/123291if you want to access mulitcast over GRE/IPSec tunnel.
How would you recommend designing a connection from an internal Cisco router across IPSec XG to XG to internal Cisco router so as to use routing protocols on the Cisco routers?
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