HP VPN Server Appliance sa3110/sa3150/sa3400/sa3450 - Virtual Private Networking Concepts Guide

Firewalls and Tunnels
5-26 Hewlett-Packard Company Virtual Private Networking Concepts Guide
Outbound Proxy
Outbound ProxyOutbound Proxy
Outbound Proxy
Outbound proxies allow devices on a red subnet to establish
communication with devices on black subnets. The outbound
proxy function performs a network address translation (NAT)
on any packets passing through the proxy. Outbound proxies
are, therefore, often used to allow users on unrouted red subnets
to have access to services on a black subnet.
If you want to allow people on the red network to browse the
World Wide Web on the Internet, define an outbound proxy as
described in the following table.
Parameter
Parameter Parameter
Parameter
Description
DescriptionDescription
Description
Parameter Value
Parameter ValueParameter Value
Parameter Value Comments
CommentsComments
Comments
Outbound proxy IP 205.250.128.240 The address the
packets take on as
they exit the red
(trusted) network.
From IP address 10.1.1.0 This address allows
anyone on the red
(trusted) network
whose IP address
starts with 10.1.1 to
go out to the black
(untrusted)
network.
From subnet mask 255.255.255.0
From application
port
ALL The application port
used to make the
HTTP (www)
request is usually
unknown.
To IP address 0.0.0.0 This address allows
you to go to any
Web site on the
Internet.