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Chapter 1
1-2
Figure 1.1 A basic configuration
Insertion of the BIG-IP, with its minimum of two interfaces, divides the
network into an external VLAN and an internal VLAN. (Both VLANs can
be on a single IP network, so that inserting the BIG-IP does not require you
to change the IP addressing of the network.) The nodes on the external
VLAN are routable. The nodes on the internal VLAN, however, are hidden
behind the BIG-IP. What appears in their place is a user-defined virtual
server. It is this virtual server that receives requests and distributes them
among the physical servers, which are now members of a load-balancing
pool.
The key to load balancing through a virtual server is address translation, and
setting the BIG-IP address as the default route. By default, the virtual server
translates the destination address of the incoming packet to that of the
network device it load balances to, making it the source address of the reply
packet. The reply packet returns to the BIG-IP as the default route, and the
BIG-IP translates its source address back to that of the virtual server. (For
outbound traffic, address translation can be modified or disabled to give
internal nodes visibility to the Internet.)
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