Generic Routing Encapsulation – GRE (asg_gre)
Description:
Generic Routing Encapsulation (GRE) is a tunneling protocol that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links over an Internet Protocol internetwork.
Syntax:
# asg_gre load | stat | verify
To configure GRE, you will need to edit this configuration file:
$FWDIR/conf/gre_loader.conf
Tunnel configuration:
tunnel=<tunnel interface name> local_tun_addr=<local tunnel ip address> remote_tun_addr=<remote tunnel ip address> phy_ifname=<physical interface name> local_addr=<local physical address> remote_addr=<remote physical address> ttl=<ttl>
Route configuration:
tunnel_route=<tunnel interface name> remote_tun_addr=<remote tunnel ip address> network=<network>
Configuration Example:
Configure tunnel interface with these parameters:
- Tunnel interface name: "GREtun"
- Local tunnel address 10.0.0.3
- Remote tunnel address 10.0.0.4
- Physical interface eth2-01
- Local address 40.40.40.1
- Remote address 40.40.40.2
- ttl 64
- Use the following line:
tunnel=GREtun local_tun_addr=10.0.0.3 remote_tun_addr=10.0.0.4 phy_ifname=eth2-01 local_addr=40.40.40.1 remote_addr=40.40.40.2 ttl=64
- To add route for 50.50.50.0/24 to go through the tunnel use the following line:
tunnel_route=GREtun remote_tun_addr=10.0.0.4 network=50.50.50.0/24
Note: All parameters are required
- After editing the configuration file, use
asg_gre to load it:
Output:
# asg_gre load
# asg_gre load
Copying configuration file to all blades... done
1_01:
Clearing existing GRE tunnels...
Loading GRE module... Done
Loading tunnel interface: GREtun
Loading route: 50.50.50.11/32 via 10.0.0.4 (GREtun)
Loading tunnel interface: GREtuA
Loading tunnel interface: GREtuB
Loading tunnel interface: GREtuC
Configuration loaded
1_02:
Clearing existing GRE tunnels...
Loading GRE module... Done
Loading tunnel interface: GREtun
Loading route: 50.50.50.11/32 via 10.0.0.4 (GREtun)
Loading tunnel interface: GREtuA
Loading tunnel interface: GREtuB
Loading tunnel interface: GREtuC
Configuration loaded
1_03:
Clearing existing GRE tunnels...
Loading GRE module... Done
Loading tunnel interface: GREtun
Loading route: 50.50.50.11/32 via 10.0.0.4 (GREtun)
Loading tunnel interface: GREtuA
Loading tunnel interface: GREtuB
Loading tunnel interface: GREtuC
Configuration loaded
1_04:
Clearing existing GRE tunnels...
Loading GRE module... Done
Loading tunnel interface: GREtun
Loading route: 50.50.50.11/32 via 10.0.0.4 (GREtun)
Loading tunnel interface: GREtuA
Loading tunnel interface: GREtuB
Loading tunnel interface: GREtuC
Configuration loaded
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