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FusionAccess 6.5 F5 Configuration Guide 02

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Two-Arm Networking

Two-Arm Networking

Networking Principles

In two-arm networking, two service network segments connect to the core switch, and the virtual server IP address and pool member IP addresses reside on the two different network segments, respectively. As shown in the following figure, the virtual server IP address is on the external virtual local area network (VLAN), which corresponds to the network segment 192.168.201.x. The pool member IP addresses are on the internal VLAN, which corresponds to the network segment 192.168.202.x.

The following figure shows the data flows in two-arm networking.


  • The server gateway points to the floating IP address of the internal VLAN.
  • External clients cannot directly connect to servers, which is secure but inconvenient.
  • Servers can learn the actual IP addresses of clients.
  • Data flows can be easily located.
  • All inbound and outbound data flows must pass through the F5.
  • The secure network address translation (SNAT) or virtual server function must be enabled if servers need to access the external network.
Updated: 2019-05-30

Document ID: EDOC1100062218

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