HP e-Commerce / XML director server appliance sa8250 - Users Guide

C H A P T E R 2 HP e-Commerce/XML Director Server Appliance SA8250 User Guide
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Routing with
Dual Interfaces
Because the SA8250 has two network interfaces, it can act as a router
in some contexts. This means that it can route between two subnets.
To do this, you must designate the SA8250 as the default gateway for
your fulfillment servers. Routes to the inside subnet are not
advertised to the outside router, but host routes are advertised to the
VIPs. Packets destined for defined VIPs are always routed through
the SA8250 to the server-side subnet. Other packets are forwarded
through the SA8250 only when the security mode is set to OPEN or
when set to CUSTOM and IP Forwarding is turned on. The SA8250’s
routing capabilities vary depending on which routing and failover
methods are used. For more details about these variations and their
relationships to routing and failover configurations, see Appendix C.
NOTE: The SA8250
cannot route multiple
subnets on one interface.
This table lists terms that are pertinent to SA8250 routing.
Term Description
Brokered
subnet
The SA8250 interface attached to the side of the
physical network on which client requests arrive.
Server-side
subnet
The SA8250 interface attached to the side of the
physical network that includes the fulfillment
servers.
“Outside”
device
The router or switch one hop from the SA8250 on
the brokered subnet
“Inside”
device
The router or switch one hop from the SA8250 on
the server-side subnet
Routing Terms