User Guide
Use of NA(P)T
NA(P)T and supported
protocols
16 Network Security - NAT & PAT
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3EC 36231 ABAA TCZZA Ed. 01
16.1 Speed Touch and NA(P)T
NAT is a technique used to share one IP address amongst several
PCs. For most applications, enabling NA(P)T on a specific STPro
interface, e.g. the Routed Ethernet interface is adequate. From
then on, all Routed Ethernet clients behind the STPro NAPT router
automatically share the same IP address.
To serve that purpose, on all relevant STPro pages a NAT
checkbox can be found.
The use of these checkboxes is described in section 16.2.
However, to run one or several servers behind a NAPT router,
additional configuration is needed. Therefore, the STPro exhibits
the 'NAT' page, allowing static IP address and UDP/TCP port
mapping for inbound IP packets to be configured.
The use of the 'NAT' page is described in section 16.3.
All supported protocols that are insensitive for NA(P)T, pass
transparently through the STPro NA(P)T router.
In addition, the STPro supports also the following protocols as
NA(P)T insensitive:
All generic TCP/User Datagram Protocol (UDP) protocols, e.g.
HTTP (Hyper Text Transfer Protocol)
Internet Control Message Protocol (ICMP)
File Transfer Protocol (FTP)
Internet Relay Chat (IRC)
Real Audio
Real Time Stream Protocol (RTSP)
H.245
H.323.
To allow the multimedia protocols defined in the H.323 ITU
recommendation to be transparent for the STPro NA(P)T router,
e.g. for using Netmeeting over the DSL line, the STPro exhibits
specific NA(P)T protocolhelper applications.