Netopia R2121, Руководство пользователя

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D-8 User’s Reference Guide
Within Expor ted Ser vices is a pop-up containing a list of well known TCP and UDP ser vices that can be
redirected to a single host on the Netopia R2121’s LAN inter face. There is also an “Other...” option which
allows for manual configuration of additional TCP or UDP por ts. There can be a total of 32 Expor ted Ser vices
that can be defined.
When a par ticular type of ser vice is redirected to an IP address, that ser vice is removed from the pop-up list,
since only one type of ser vice can be redirected to a single host. However several different types of ser vices
can be redirected to a single or multiple hosts. For example, por t 80 (WWW Ser ver) could be redirected to
192.168.5.3 on the Netopia R2121’s LAN inter face as well as por t 23 (Telnet) can be redirected to that same
host.
Summary
NAT is a power ful feature of the Netopia R2121 and when used and set up properly can yield a secure network
while only using one IP address on the WAN inter face. Note that the addresses listed in this appendix are for
demonstration purposes only. Do not use these addresses when configuring your local network.
Add Exported Service
+-Type------Port--+
+-----------------+
Service... | ftp 21 |
| telnet 23 |
| smtp 25 |
Local Server's IP Address: | tftp 69 |
| gopher 70 |
| finger 79 |
| www-http 80 |
| pop2 109 |
| pop3 110 |
| snmp 161 |
| timbuktu 407 |
| pptp 1723 |
| irc 6667 |
| Other... |
+-----------------+
ADD EXPORT NOW CANCEL