IPSEC

GRE over IPsec and IPsec over GRE are both tunneling configurations, but they have key differences in implementation and use cases. Key Differences When you apply crypto map directly on the GRE tunnel interface, IPSec encapulates the interesting traffic and then this IPSec packet is placed into GRE. interface Tunnel0 crypto map CMAP —————-> IPSec over GRE When […]