MDS 05-6632A01, Rev. F
MDS Orbit MCR/ECR Technical Manual
331
On the REMOTE, when the NX link goes down, the BOND interface makes GRE layer-2 tunnel interface
as the active interface (after some configurable delay to avoid link flapping) thereby tunneling LAN
traffic through the cellular network. When NX link comes back up, the BOND interface makes it the
active interface (after some configurable delay to avoid link flapping) thereby restoring layer-2
communications over the NX link.
NOTE
In this setup, the failover is initiated by the REMOTE. Therefore, a periodic traffic stream is
required from REMOTE towards the AP, to update the Bridge forwarding table on the AP, so
that traffic for remote assets connected to failed-over REMOTE is sent over the GRE layer-2
tunnel for that REMOTE at the AP. If there is no periodic application data stream from remote
assets towards the AP, it is recommended that a NETMON service be setup on the REMOTE
that sends ICMP ECHO (ping) requests periodically (say, every 30 secs.) to the AP. The time
interval of this periodic data stream will determine the fail-over time for traffic from AP
towards the failed-over REMOTE.
Using the Web UI
AP Configuration
Following features need to be configured on the AP:
IPsec transport mode connection – To secure GRE traffic to/from REMOTE-1 and REMOTE-2
1.
over Cellular network.
GRE tunnel – To send/receive layer-2 traffic to/from REMOTE-1 and REMOTE-2’s LAN
2.
segments over Cellular network.
Adding GRE tunnels to the Bridge interface – To enable flow of layer-2 traffic between local LAN
3.
segment and REMOTE-1 and REMOTE-2’s LAN segments over Cellular network.
Configure IPsec Transport Mode Connections
Configure an IPsec VPN transport mode connection for the REMOTE-1. Please refer to section on
1.
IPsec VPN for help with configuring IPsec VPN using Web UI.
Configure an IPsec VPN transport mode connection for the REMOTE-2. Please refer to section on
2.
IPsec VPN for help with configuring IPsec VPN using Web UI.
Configure GRE tunnels
Configure GRE tunnel interface towards REMOTE-1 with mode = ethernet-over-gre, src-address =
1.
10.150.1.1 (the local Cell interface address as used in IPsec VPN towards REMOTE-1) and dst-
address = 10.150.1.10 (the remote Cell interface address as configured in IPsec VPN towards
REMOTE-1).
-
Navigate to
Interfaces / Add/Delete Interfaces
and click ‘Add’ to create new interface named
‘GRE-REMOTE-1’:
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