How to run dynamic routing protocols over the VPN

IPSec supports the encryption of unicast IP traffic only. Therefore, dynamic routing protocols such as Enhanced Interior Gateway Routing Protocol (EIGRP) and Open Shortest Path First (OSPF) and non-IP traffic like Internetwork Packet Exchange (IPX) and AppleTalk are also unable to be encrypted using IPSec.

There is workaround, encapsulate such traffic in Generic Routing Encapsulation (GRE) before encryption, using a GRE over an IPSec configuration.With GRE over IPSec, traffic will be encapsulated first and then encrypted.


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