Change default IP gateway on SD-WAN partner gateway
Article ID: 375550
Updated On:
Products
Issue/Introduction
Broadcom SD-WAN Gateways are a distributed network of gateways, deployed around the world or on-premises at service providers, provide scalability, redundancy and on-demand flexibility. Partner gateways are on-premises and hosted by service providers. When a service provider wants to change the default IP gateway of a partner SD-WAN gateway, there is no way we can do it on VCO. This article introduces a method to change the IP gateway of a partner SD-WAN gateway without deploying a new virtual instance.
Environment
All supported SD-WAN gateway versions
Resolution
1. Login SD-WAN partner gateway's command line.
2. Check the current IP gateway, from below output the default IP gateway is 20.0.1.1 for example.
root@A41-5Site-gateway-1:~# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 20.0.1.1 0.0.0.0 UG 1 0 0 eth0
0.0.0.0 20.0.1.1 0.0.0.0 UG 1 0 0 eth0
0.0.0.0 101.101.101.10 0.0.0.0 UG 2 0 0 eth1
0.0.0.0 101.101.101.10 0.0.0.0 UG 2 0 0 eth1
20.0.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
101.101.101.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
169.254.128.0 0.0.0.0 255.255.128.0 U 0 0 0 gwd1
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2
3. Use 'vi' command or WinSCP to change the IP gateway settings in /etc/netplan/*.yaml, in lab it is '/etc/netplan/interfaces.yaml', but in service providers' production SD-WAN gateway it could be other names. Below is the output of a typical yaml:
root@A41-5Site-gateway-1:~# cat /etc/netplan/interfaces.yaml
network:
ethernets:
eth0:
addresses: [20.0.1.2/24]
routes:
- {metric: 1, to: 0.0.0.0/0, via: 20.0.1.1} <----Change this IP
eth1:
addresses: [101.101.101.11/24]
routes:
- {metric: 2, to: 0.0.0.0/0, via: 101.101.101.10}
eth2:
addresses: [192.168.0.111/24]
routes: []
renderer: networkd
version: 2
4. Save changes and check:
root@A41-5Site-gateway-1:~# cat /etc/netplan/interfaces.yaml
network:
ethernets:
eth0:
addresses: [20.0.1.2/24]
routes:
- {metric: 1, to: 0.0.0.0/0, via: 20.0.1.5}
eth1:
addresses: [101.101.101.11/24]
routes:
- {metric: 2, to: 0.0.0.0/0, via: 101.101.101.10}
eth2:
addresses: [192.168.0.111/24]
routes: []
renderer: networkd
version: 2
5. Issue 'reboot' command to restart entire the SD-WAN partner gateway instance.
6. Once the SD-WAN partner gateway instance boots up, login and check if the change has taken effect.
root@A41-5Site-gateway-1:~# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 20.0.1.5 0.0.0.0 UG 1 0 0 eth0
0.0.0.0 20.0.1.5 0.0.0.0 UG 1 0 0 eth0
0.0.0.0 101.101.101.10 0.0.0.0 UG 2 0 0 eth1
0.0.0.0 101.101.101.10 0.0.0.0 UG 2 0 0 eth1
20.0.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
101.101.101.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
169.254.128.0 0.0.0.0 255.255.128.0 U 0 0 0 gwd1
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2
Additional Information
Changing this configuration requires an SD-WAN partner gateway reboot which takes ~5-10 minutes to complete. If possible, perform this change in a maintenance window.
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