GRE is a tunneling protocol that encapsulates any layer-3 data packets (including IP, IPSec, ICMP, etc.) into virtual point-to-point network connections. This is very useful, among other things, when the two communication partners wish to use a particular transport protocol (for example, IPSec) that is unavailable on the transmission path. Since GRE itself does not encrypt the tunneled data, the two communication partners themselves must ensure that the data is protected.
LANCOM Systems GmbH | A Rohde & Schwarz Company | Adenauerstr. 20/B2 | 52146 Wuerselen | Germany | E‑Mail info@lancom.de
