User manual ZYXEL PRESTIGE 324

[. . . ] Prestige 324 Intelligent Broadband Sharing Gateway User's Guide Version 3. 60 January 2003 Prestige 324 Intelligent Broadband Sharing Gateway Copyright Copyright © 2003 by ZyXEL Communications Corporation. The contents of this publication may not be reproduced in any part or as a whole, transcribed, stored in a retrieval system, translated into any language, or transmitted in any form or by any means, electronic, mechanical, magnetic, optical, chemical, photocopying, manual, or otherwise, without the prior written permission of ZyXEL Communications Corporation. Published by ZyXEL Communications Corporation. All rights reserved. Disclaimer ZyXEL does not assume any liability arising out of the application or use of any products, or software described herein. [. . . ] A service request that does not have a server explicitly designated for it is forwarded to the default server. If the default is not defined, the service request is simply discarded. When you configure NAT port forwarding rules, the firewall automatically allows traffic originating from the WAN to be forwarded to the LAN IP address(es) of the computers specified. These computers do not have firewall protection in this case. The most often used port numbers are shown in the following table. Please refer to RFC 1700 for further information about port numbers and refer to the included disk for more examples and details on NAT. NAT 11-15 Table 11-7 Services & Port Numbers SERVICES ECHO FTP (File Transfer Protocol) Telnet SMTP (Simple Mail Transfer Protocol) DNS (Domain Name System) Finger PORT NUMBER 7 21 23 25 53 79 HTTP (Hyper Text Transfer protocol or WWW, Web) 80 POP3 (Post Office Protocol) NNTP (Network News Transport Protocol) SNMP (Simple Network Management Protocol) SNMP trap PPTP (Point-to-Point Tunneling Protocol) 110 119 161 162 1723 Configuring a Server behind NAT Follow these steps to configure a server behind NAT: Step 1. Enter 15 in the main menu to go to Menu 15 - NAT Setup. Enter 2 to go to Menu 15. 2 - NAT Server Setup. Enter a port number in an unused Start Port No field. To forward only one port, enter it again in the End Port No field. To specify a range of ports, enter the last port to be forwarded in the End Port No field. Enter the inside IP address of the server in the IP Address field. In the following figure, you have a computer acting as an FTP, Telnet and SMTP server (ports 21, 23 and 25) at 192. 168. 1. 33. Press [ENTER] at the "Press ENTER to confirm . . . " prompt to save your configuration after you define all the servers or press [ESC] at any time to cancel. Step 4. Step 5. 11-16 NAT Prestige 324 Intelligent Broadband Sharing Gateway Menu 15. 2 - NAT Server Setup Rule Start Port No. IP Address --------------------------------------------------1. 0 0 0. 0. 0. 0 Press ENTER to Confirm or ESC to Cancel: Figure 11-10 Menu 15. 2 -- NAT Server Setup Figure 11-11 Multiple Servers Behind NAT Example NAT 11-17 11. 3. 3 Trigger Port Setup The Prestige records the IP address of a LAN computer that requests a service that you have defined as a "trigger port". The response from the Internet can then be forwarded directly to the LAN computer. Trigger ports are transient; they only exist while in use or are timed out. The following is a trigger port example Figure 11-12 Trigger Port Forwarding Process: Example 1. Jane requests a file from the Real Audio server (port 7070). Port 7070 is a "trigger" port and causes the Prestige to record Jane's computer IP address. [. . . ] 16-8 System Information . . . . . . . . . . . . . . . . . . . . 16-1, 16-3, 16-4 System Maintenance16-1, 16-2, 16-4, 16-5, 16-6, 16-7, 16-10, 16-11, 17-2, 17-5, 17-14, 17-16, 18-1, 18-2, 18-3, 18-4, 18-6 System Name. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9 System Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-1 40 Index System Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-5 T TCP/IP 7-2, 7-6, 7-7, 7-8, 9-7, 13-7, 13-9, 13-12, 13-16, 19-1 TCP/IP filter rule. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-7 Telnet Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-1 Telnet Under NAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-1 TFTP And FTP Over WAN} . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-4 Restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-4 TFTP and FTP over WAN Will Not Work When. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-4 TFTP File Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-14 TFTP Restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-4 time and date setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Time and Date Setting. . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]