User manual

Chapter 3: Qube 3 Services
54 Cobalt Qube 3 User Manual
IP Masquerading (NAT)
The IP Masquerading feature simplifies and conserves IP addresses by presenting
a single IP address for a private network to the public network. IP Masquerading
enables private IP intranetworks that use non-registered IP addresses to connect
to the Internet. IP Masquerading is both a security measure and a method of
conserving IP addresses.
On the Qube 3, IP Masquerading functions as a router connecting two networks
together. IP Masquerading advertises only one IP address for the entire network
to the outside world. This provides additional security, since the entire internal
network is hidden from the outside world behind that single IP address.
For outgoing packets, IP Masquerading translates a private IP address (an
IP address that is not globally unique) on the internal network into the legal
address of the secondary interface; packets are then forwarded onto the Internet.
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Note: IP Masquerading is also known as Network Address
Translation (NAT).