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More on NAT…
In case you're still in the dark about NAT, it is basically a protocol that allows a LAN to use a set of IP addresses for internal traffic and another set for external traffic. Whenever the machines behind the router require communication with the outside world, data packets must first flow through the router. The router will then substitute the internal IPs of the machines with its own and forwards it to the machines residing outside. By the same token, the external machines will reply to the router, which will in turn determine which machines the various packets are supposed to go to.
The basic principles of NAT are to:
- Enable home/office users to use a single WAN connection for their internal LAN machines.
- Combine multiple ISDN connections into a single Internet connection.
- Provide a type of firewall by hiding IP addresses. All external access will appear to originate only from the router.
NAT Limitations
Even though NAT is able to translate most protocols successfully, there are certain instances where NAT is unable to do the job. NAT is not a total cure for sharing Internet access, and many protocols e.g. XDCMP embed IP address information inside the IP datagram payload. NAT by itself only translates IP header address and port information. Such special protocols hence require helper functions called Application Level Gateways (ALG) to make them work behind NAT.
Specifications
Below are the specifications of the router, lifted directly from SMC's documentation.
- Instant Internet sharing for cable and DSL subscribers, ISDN and even 56k modem users.
- Static IP, Dynamic IP, PPPoE, PPTP, Dial-up networking
- 11 Mbps wireless operation for maximum mobility use.
- Firewall security against hackers.
- Simultaneous Internet access for up to 252 PCs on the LAN using 1 IP address.
- LAN: 3 port 10/100 Mbps (RJ45)
- WAN: 1 port broadband uplink (RJ-45) for Cable/DSL modem
- 1 RS232 port for dial-up and ISDN
- Built-in print server. Supports Win95/98/NT/2000,UNIX LPR
- Built-in DHCP server, VPN, NAT Firewall Protection
- Platform independent – works with PCs or Macs
- Supports IEEE 802.3, IEEE 802.3u and IEEE 802.11b standards.
Packing List- One wireless broadband router unit
- One installation CD-ROM
- One power adapter
- One CAT-5 UTP Fast Ethernet cable
Contents inside the box.
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