一般來說，F5的LTM主要是服務外對內做附載平衡。
外面的人連F5的一個Virtual server IP，F5往Pool Member丟，Pool Member裡面有很多個Node Server，使用Round Robin或其他方式來達到附載平衡。
如果是內對外呢？可能Node Server或其他不是Node的設備要出去做其他服務。
這邊就要設定"IP forwarding virtual servers"。
官方KB→
https://support.f5.com/csp/article/K7595
Creating an IP forwarding virtual server
- Log in to the Configuration utility.
- Navigate to Local Traffic > Virtual Servers.
- Click Create.
- Enter a Name for the virtual server.
- From the Type menu, select Forwarding (IP). Enter the ip address in CIDR format (example: 192.168.0.100/24 or 192.168.0.100/255.255.255.0) in the Destination Address text box.
Note: For BIG-IP versions prior to 11.6.0., if the destination is a single host, select Host, or if the destination is a network, select Network. Enter the IP address for the virtual server (enter a Netmask if the destination is a network.
- Enter a Service Port number, or Select a service from the adjacent menu (type an asterisk character to match all ports).
- Clear the Notify Status to Virtual Address check box.
- Click Finished.
LAB：
目的：172.16.1.0/24與172.16.2.0/24要互通
設定截圖：
