Note:
The IPsec profile does not need to be configured for establishing an IPsec VPN,
but needs to be configured for establishing a DM VPN.
5.3.2 GRE
The Generic Routing Encapsulation (GRE) protocol can be used to encapsulate
datagrams of some network layer protocols, so that these encapsulated datagrams
can be transmitted on the IPv4 network.
Scenario: GRE is enabled for VG814_A and VG814_B through the public network.
Method for enabling GRE for transmission channels of VG814_A and VG814_B:
1. Click "VPN >> GRE" and then click Add.
2. Set "Index" as required. Select "Point to Point" or "Subnet" for "Network
Type". Set "Local Virtual IP" and "Peer Virtual IP", ensuring that they are on the
same network segment. Enter the source and peer IP addresses or interfaces and the
key. Click Apply & Save.
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