Ne Two Rk Addre Ss T Ra Nsla Tio N (Nat ); Overview; What You Can Do In This Chapter; What You Need To Know - ZyXEL Communications XMG3512-B10A User Manual

Ne two rk Addre ss T ra nsla tio n
11.1 O ve rvie w
This chapter discusses how to configure NAT on the XMG. NAT (Network Address Translation - NAT, RFC
1631) is the translation of the IP address of a host in a packet, for example, the source address of an
outgoing packet, used within one network to a different IP address known within another network.
11.1.1 Wha t Yo u C a n Do in this C ha pte r
• Use the
Po rt Fo rwa rding
local network
• Use the
Applic a tio ns
network (Section 11.3 on page
• Use the
Po rt T rig g e ring
page 154).
• Use the
DMZ
• Use the
AL G
page 158).
• Use the
Addre ss Ma pping
page 158).
• Use the
Se ssio ns
page 160).
11.1.2 Wha t Yo u Ne e d T o Kno w
Inside / O utside
Inside/outside denotes where a host is located relative to the XMG, for example, the computers of your
subscribers are the inside hosts, while the web servers on the Internet are the outside hosts.
G lo b a l/ L o c a l
Global/local denotes the IP address of a host in a packet as the packet traverses a router, for example,
the local address refers to the IP address of a host when the packet is in the local network, while the
global address refers to the IP address of the host when the same packet is traveling in the WAN side.
screen to configure forward incoming service requests to the server(s) on your
(Section 11.2 on page
screen to forward incoming service requests to the server(s) on your local
153).
screen to add and configure the XMG's trigger port settings
screen to configure a default server
screen to enable and disable the NAT and SIP (VoIP) ALG in the XMG
screen to configure the XMG's address mapping settings
screen to configure the XMG's maximum number of NAT sessions
XMG3512-B10A User's Guide
C
HA PTER
150).
(Section 11.5 on page
149
1 1
(NAT )
(Section 11.4 on
157).
(Section 11.6 on
(Section 11.7 on
(Section 11.8 on