GRE restrictions

[egalvao]

I want to use GRE + IPSec over a x25 infrastructure in one site-to-site VPN topology. Is it possible? Is it possible to use GRE with x25 or not? Are there any restriction?

Thanks

[Philip D'Ath · Accepted solution]

I don't see why this wouldn't work.

All that GRE requires is IP layer connectivity. If both ends can ping each other, then GRE will work.

Likewise for IPSec.