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Chapter 14 

Configuring Network Address Translation 

 

 

 

72 

Chapter 14

 

Configuring Network Address Translation  

 
In this chapter, we will illustrate on how you can host some Internet Servers on your LAN via 
the use of Compex WP11B+ configuration interface. 
 
Before you attempt any NAT or Filtering configurations, you should ensure the Compex 
WP11B+ is ready for basic Internet access on LAN. 

14.1

 

NAT and Virtual Server 

 
Compex  WP11B+ comes with a simple Network Address Translation (NAT) Firewall 
protection for your LAN. It uses a mechanism that substitutes a Private IP address with 
a Public IP address when a packet leaves the Private network; and restore the 
destination Public IP address with the Private IP address when the packet enters the 
Private network. With NAT firewall, you can protect your LAN from unauthorized 
access from the WAN. 
 
One feature of the NAT is that any unauthorized requests from the Internet will not be 
allowed to pass through Compex  WP11B+. Hence, with NAT, you can host a Virtual 
Server on the LAN. NAT works by translating packets of Private IP addresses to appear 
as originating from a single Public IP address; thus allowing multiple PCs in the LAN to 
appear as one PC to the WAN interface. 
 
The implementation of a Virtual Server allows Internet servers such as Web Server, 
FTP Server and Mail Server to be hosted on your network. It is able to support both Port 
Forwarding and IP-Forwarding Servers. 
 

 

NOTE 

Note that static IP supports IP Forwarding only. 

 
 
 
 
 
 
 
 
 
 
 
 

Содержание WP11B+

Страница 1: ......

Страница 2: ...ght laws Manual Revision by Mah Manual Number U 0373 V1 1C Version 1 1 July 2003 Disclaimer Compex Inc provides this manual without warranty of any kind either expressed or implied including but not l...

Страница 3: ...dealer or an experienced radio TV technician for help Caution Exposure to Radio Frequency Radiation To comply with the FCC RF exposure compliance requirements the following antenna installation and de...

Страница 4: ...ve This Class B digital apparatus complies with Canadian ICES 003 Declaration of Conformity Compex Inc declares the following Product Name Compex 11Mbps Wireless LAN Access Point Model No WP11B confor...

Страница 5: ...a Unit A Anaheim CA 92807 USA Call Fax Tel Tel Fax BBS 1 714 630 7302 8 a m 5 p m Pacific time 1 800 279 8891 Ext 122 Technical Support 1 714 630 6521 1 714 630 2570 24 hour access Europe Write ReadyL...

Страница 6: ...efer to your operating system s documentation for networking How to Use this Document The document is written in such a way that you as a user will find it convenient to find specific information pert...

Страница 7: ...Compliant 2 1 3 2 11Mbps High Rate Communication 2 1 3 3 Wire Equivalent Privacy WEP 2 1 3 4 Wireless Ethernet Transparent Bridging 2 1 3 5 Broadband Internet Sharing 2 1 3 6 LAN to LAN Bridging 3 1...

Страница 8: ...7 4 IEEE 802 1X RADIUS Setup 31 Chapter 8 Setting up of Wireless LAN to LAN Bridge Network using AP Client Mode 33 Chapter 9 Setting up of Wide Area Network using Gateway Mode 37 9 1 Selecting the Ri...

Страница 9: ...E Cable Service 64 13 3 Configuring PPP over Ethernet Session PPPoE 65 13 3 1 How to Configure SingNet PacNet and QALA DSL Broadband 65 13 4 Configuring for SingTel Magix SuperSurf 67 13 5 Configuring...

Страница 10: ...apter 20 Hardware Reset of Compex WP11B 92 Appendix I Login to Web based Interface manually 95 AI 1 Configuration of Compex WP11B using Web based Interface 95 Appendix II TCP IP Configuration 97 AII 1...

Страница 11: ...il or downloading a program while in the garden near your swimming pool or anywhere in your house is now a reality With the many benefits that a wireless network environment brings many users are cont...

Страница 12: ...th the older 2Mbps and 1Mbps standard 1 3 3 Wire Equivalent Privacy WEP Compex WP11B uses a private encryption key to ensure data security This is commonly referred to as Wire Equivalent Privacy WEP C...

Страница 13: ...Firmware Compex WP11B is specially designed with a flash ROM that allows you to update the Compex WP11B with the latest firmware release via a web based configuration interface 1 3 8 Web Based Interfa...

Страница 14: ...4b Side view of Compex WP11B Section 1 Figure 1 4c Side view of Compex WP11B Section 2 Figure 1 4d Connection to indoor antenna 10 13 11 12 WA HGA 5 sold separately Connecting WA HGA 5 to WP11B will i...

Страница 15: ...ing at 100Mbps 5 COL LED Steady Green Light Collision occurs at the network segment 6 FDX LED Steady Green Light Network is in Full Duplex Mode No Light Network is in Half Duplex Mode 7 WLAN Speed LED...

Страница 16: ...AN PCMCIA Card to support wireless client 11 5V DC 2 1A Accepts 5V DC 2 1A input 12 RJ45 Ethernet Port 10Base T or 100 Base TX Port connects to cable modem or DSL modem 13 Reset Button Compex WP11B wi...

Страница 17: ...2497MHz Europe Asia Data Rate CCK 11Mbps 5 5Mbps DQPSK 2Mbps DBPSK 1Mbps Private Encryption 64 bit or 128 bit WEP selectable Operating Mode Access Point Bridge Access Point Client Gateway Wireless Ro...

Страница 18: ...n Interface Remote Router Management RJ45 10 100Mbps port Per Node Per Group All Classful Classless subnet Yes with DHCP reservation Port Forwarding and IP Forwarding Yes Yes Yes Web based TELNET Comm...

Страница 19: ...Clip holder stand Wall Mounting Template Cross RJ 45 cable 2 2 Setup Considerations The following are the setup considerations you need to take note of before connecting the Compex WP11B to your netwo...

Страница 20: ...Compex WP11B please follow the steps listed below 1 Snap the Compex WP11B onto the clip holder stand as shown in Figure 3b Figure 3b Illustration on using Clip holder Stand Clip it directly onto the v...

Страница 21: ...your PC to the Ethernet port of Compex WP11B using an MDIX UTP RJ45 cable Please note that before your PC can access to the Internet the NIC adapter and TCP IP protocol have to be installed and config...

Страница 22: ...this program is that it does not require any alteration to the TCP IP configuration on your computer Connect the WP11B to your computer via a crossover UTP cable As pre configuration of TCP IP is not...

Страница 23: ...I 3 Click on the OpenWeb button and the system will automatically link you to Compex WP11B s authentication page as shown in Figure 4 1b Figure 4 1b Log in to Compex WP11B This window lists all Networ...

Страница 24: ...ce From here you will able to see three different window frames on the screen namely Command Menu Window Configuration Window and Message Window You will see a listing of the functions stated in the C...

Страница 25: ...it various internal settings of Compex WP11B System Identity Set System s Clock Firmware Update Save or Reset Settings Reboot System Change Password Logout HELP menu Contact information of a technical...

Страница 26: ...de Exit uConfig Mode menu End the Utility Configuration Program ExituConfig CONFIGURATION menu Basic Ethernet and Wireless setup Mode Selection Management Port SNMP Setup SYSTEM TOOLS menu Edit variou...

Страница 27: ...EM TOOLS menu Edit various internal settings of Compex WP11B System Identity Set System s Clock Firmware Update Save or Reset Settings Reboot System Change Password Logout HELP menu Contact informatio...

Страница 28: ...main names into IP addresses If your WAN connection is using Static IP you should configure the primary and secondary DNS IP addresses with the DNS information provided by your Broadband Internet Serv...

Страница 29: ...he configurations 3 Logon again using your new IP Address to avoid connection with an incorrect profile 5 2 Configuring DHCP Server You may configure the built in DHCP Server of the Compex WP11B to re...

Страница 30: ...of the designated PC 4 Fill in the MAC address of the designated PC in the Hardware Address entry NOTE The DHCP server will ignore the Host Name if it finds a match in the Hardware Address It checks t...

Страница 31: ...n the LAN Setup window shown in Figure 5 1a The list of released IP addresses will be displayed as shown in Figure 5 2b Figure 5 2b Show DHCP Leases NOTE Invalid date and time shown under Expires colu...

Страница 32: ...ent vendors can easily build SNMP agents to their products SNMP is extensible allowing vendors to easily add network management functions to their existing products SNMP also separates the management...

Страница 33: ...its own Pseudo VLAN This restricts communication between wireless clients of different Pseudo VLAN while retaining wireless accessibility to the network resources The subnet view illustrates Pseudo G...

Страница 34: ...o Ethernet Bridging 7 1 Adding a client from the Pseudo Group The default mode for Compex WP11B is in AP Bridge therefore no further configuration is required 1 Activate uConfig program Click on OpenW...

Страница 35: ...n in Figure 7 1b will appear Figure 7 1b Selection of Network Mode 3 Enter the Access Point Setup parameters for your network An example is shown in Figure 7 1c with these parameters entered Example C...

Страница 36: ...cannot be reached the link will be disconnected RTS Threshold The RTS Threshold limits the length of the RTS frame that is used to initiate a transmission Please do not change this field unless you ar...

Страница 37: ...menu as shown below and click the Apply button Figure 7 1d Defining Access Control 5 Add in the MAC Address of those wireless clients into the various groups For the example illustrated in Figure 7 1...

Страница 38: ...ick on Apply button as shown in Figure 7 1f Figure 7 1f Adding MAC address 7 Next you have the option to choose either 64 bits or 128 bits WEP Encryption Select your option and click the Apply button...

Страница 39: ...n the Save button Reboot the device Figure 7 1i Defining the key for 128 bit WEP 9 Click on the Save button and then reboot Compex WP11B for the changes to take effect 7 2 Delete a client from the Pse...

Страница 40: ...e Disable 5 Per node 64 bit 6 Per node 128 bit 7 Pseudo VLAN Disable 8 Pseudo VLAN 64 bit 9 Pseudo VLAN 128 bit For combination settings the methods to key in the fields are the same 7 3 Closed System...

Страница 41: ...security than even wired connections can offer Figure 7 4a IEEE 802 1X RADIUS Setup MAC authentication If enabled client mac address must be authenticated before it can access resource It can be combi...

Страница 42: ...key The shared secret may be any alphanumeric string and case sensitive The default password is private Authentication Lifetime seconds The interval each client session may be active before being aut...

Страница 43: ...her IEEE 802 11b compliant Access Point to perform transparent Bridging between two Fast Ethernet networks The following physical layout of a Wireless LAN to LAN Bridge shows Compex WP11B functioning...

Страница 44: ...t Client as shown in Figure 8 1b Figure 8 1b Selection of Network Mode 9 Click on the Apply button The system will prompt you to reboot your system 10 Go to uConfig program and wait for the system to...

Страница 45: ...encryption method Channel The Direct Spread Sequence Spectrum DSSS technology divides the 2 4GHz band into 14 frequency channels where the number of sub channels is subjected to the local regulations...

Страница 46: ...idge Network using AP Client Mode 36 14 Enter your encryption key The parameters take in hexadecimals Figure 8 1e Encryption entries for 64 bit Figure 8 1f Encryption entries for 128 bit 15 Click on t...

Страница 47: ...x WP11B will request for an IP address which will be automatically assigned by your service provider Certain Internet Service Providers require DHCP Client ID before an IP address is released For such...

Страница 48: ...Figure 9 2a Connect Compex WP11B to PC 2 As there are many different brands of broadband modems some broadband modems may provide a straight connect MDI Ethernet cable while some may use a cross conn...

Страница 49: ...ke a minute or more 8 Next power ON the Compex WP11B When either of the 10M or 100M Ethernet LED lights up this shows that there is a cable connection between the ADSL modem and the Compex WP11B 9 Pow...

Страница 50: ...nd Internet Gateway Assuming that Compex WP11B is in the default setting 1 Activate the uConfig program click on the OpenWeb button 2 Go to the CONFIGURATION menu and click on Mode Selection Select Ga...

Страница 51: ...o to uConfig program and click on the OpenWeb button Logon again and now Compex WP11B is in Gateway Mode Figure 9 3b Selection of Network Mode Gateway 4 Next click on the Apply button to proceed to th...

Страница 52: ...eudo Group Step 4 6 If you want to configure WAN setup proceed to WAN Setup and the following GUI will appear By default Compex WP11B is pre configured with Dynamic IP which is suitable for most Cable...

Страница 53: ...ction from the Command window you can change the IP address which the uConfig program will trace Figure 9 3e uConfig IP Setup More advanced features can also be configured to Compex WP11B for you to m...

Страница 54: ...is way the Ethernet port of Compex WP11B can be used to connect to other networking devices such as switches to cater for more PCs 10 1 Setting up Compex WP11B as Wireless Routing Client 1 Connect a c...

Страница 55: ...LED lights up this shows that there is a good cable connection between the ADSL modem Compex WP11B and Compex NetPassage 16A 6 Power ON the PC notebook and the WLAN port LED should light up after ente...

Страница 56: ...2 Go to the CONFIGURATION menu and click on Network Mode Selection Select Wireless Routing Client mode and click on the Apply button Next click on the Yes button to reboot the device Figure 10 2a Sele...

Страница 57: ...re 10 2b Wireless Routing Client Setup 5 Next you have the option to choose either 64 bit or 128 bit for WEP Encryption from the WEP Setup as shown below Select your option and click on the Apply butt...

Страница 58: ...ncryption entries for 64 bit Figure 10 2e Encryption entries for 128 bit 7 Click on the Save button and then reboot to take effect 8 If you want to configure WAN setup proceed to WAN Setup and the fol...

Страница 59: ...is like our AP Client but it only can connect one wired PC This mode is for some ISPs which use it to bridge wired to wireless network Figure 11 1a Connecting the Wireless Ethernet Adapter WP11B Acces...

Страница 60: ...n Mode Selection In the Network Mode Setup select Wireless Ethernet Adapter as shown in Figure 11 1a Figure 11 1a Selection of Network Mode 3 Click on the Apply button The system will prompt you to re...

Страница 61: ...ess Point Client in the network This is particular useful if there are many wireless devices in the network The parameter allows a maximum of 31 alphanumeric characters SSID Acronym for Service Set Id...

Страница 62: ...llow a more efficient usage of the power on the device RTS CTS Threshold This determines the minimum bytes of a packet size before invoking the RTS CTS mechanism Packets that exceed the specified RTS...

Страница 63: ...vate encryption key to ensure data security From Figure 11 3a you have the option to choose either 64 bit or 128 bit for WEP Encryption from the WEP Setup as shown below Select your option and click o...

Страница 64: ...Chapter 11 Setting up of WAN using Wireless Ethernet Adapter 54 Figure 11 3c Encryption entries for 128 bit for illustration purposes Click on and then reboot to take effect...

Страница 65: ...de Compex WP11B may also be configured in Wireless Bridge Link mode which allows point to point communication between different buildings within 100meters In Figure 12 1a both Compex WP11B are configu...

Страница 66: ...PC 2 Power on both your workstation and the Compex WP11B The WLAN LED should light up indicating the connection has been established 3 Now you may start configuring Compex WP11B as Wireless Bridge Lin...

Страница 67: ...button 2 Go to the CONFIGURATION menu and click on Network Mode Selection Select Wireless Bridge Link mode and click on the Apply button Next click on the Yes button to reboot the device Figure 12 2a...

Страница 68: ...int to Point Setup 5 From here you need to know the MAC address of the other Compex WP11B Simply logon to the web interface of another Compex WP11B and hit on the About System option in the Command Me...

Страница 69: ...ed to 00 02 2d a6 a2 4a and will prompt you to reboot your system Click Yes button to reboot 7 Next you may wish to use a private encryption key to ensure data security Simply go to select Wireless Br...

Страница 70: ...ireless Bridge Link Mode 60 8 Enter your encryption key The parameters take in hexadecimals Figure 12 2f Encryption entries for 64 bit Figure 12 2g Encryption entries for 128 bit 9 Click on the Save b...

Страница 71: ...he ADSL modem together with the logon account on your PC or notebook Ensure that it can connect successfully before attempting to run it with Compex WP11B For simplicity and illustration purposes it i...

Страница 72: ...your ISP Figure 13 1b WAN Static IP Address Configuration 4 Fill in the required field for the IP address Network Mask and Gateway 5 All these information can be obtained from your ISP Network Admini...

Страница 73: ...ID issued by the ISP into the System Name field in the System Identity NOTE If your computer is not able to resolve any web site please verify that your DNS entry of the computer has been defined corr...

Страница 74: ...for Singapore Cable Vision SCV Service section 2 Next click on System Identity at the Command window under the SYSTEM TOOLS menu and enter the required field as shown Figure 13 2b System Identity 3 Cl...

Страница 75: ...This procedure assumes you have a login account from SingNet Pacific Internet or QALA DSL broadband service and also all the necessary hardware installation is in place NOTE If you have opted for sel...

Страница 76: ...ce the Compex WP11B is up and running you might want to add advanced configurations such as Filtering to better manage your LAN For details refer to the Packet Filtering section Username Enter your AD...

Страница 77: ...service 1 Select WAN Type and click on the Change button 2 Check the radio button next to the Singapore ADSL and click on the Save button Figure 13 4a WAN Type Singapore ADSL 3 The WAN Setup screen di...

Страница 78: ...owser to start surfing the Net In addition you can implement advanced features such as Filtering Packet Filtering to control over your LAN users Internet access 13 5 Configuring for BigPond Australia...

Страница 79: ...et If you have subscribed to Optus Home in Australia please configure your connection profile using Dynamic IP 3 Fill in the required fields for Username Password and Idle Timeout 4 After you have ent...

Страница 80: ...rough public data networks such as Internet 1 Click on WAN Setup and click on the Change to select WAN type as PPTP 2 Press the Change button and the list of supported WAN type will be displayed as sh...

Страница 81: ...he idling timeout value for Compex WP11B to disconnect from the ISP 0 value in this field disables idling timeout function When set to 0 Compex WP11B remains connected unless disconnected by the ISP O...

Страница 82: ...nd restore the destination Public IP address with the Private IP address when the packet enters the Private network With NAT firewall you can protect your LAN from unauthorized access from the WAN One...

Страница 83: ...r etc to specific Private IP address in your LAN you can choose to host the servers by using the port Forwarding Virtual server For example suppose that you have a FTP Server with an IP address of 192...

Страница 84: ...ation for example Private IP Address 192 168 168 14 Server Type HTTP 5 Click on the Add button to add the address into the Port based mapping table Known Server It supports a pre defined list of commo...

Страница 85: ...applications not defined in the Known Server you will have to enter Port in the Custom Server the port number for TCP UDP port used by this Virtual Server You can also assign a name to this Virtual Se...

Страница 86: ...information which is used for forwarding the information The Routing Information Protocol RIP will receive the routing information from other routers on the network 15 2 Adding Static Routes If you a...

Страница 87: ...reboot your gateway Figure 15 2b Adding Static IP Routing Destination IP Address A remote network IP address to which you want to assign the static route For example if you want to route your WP11B t...

Страница 88: ...efined the users may select to bypass or to block the outgoing packets that do not match the rules Figure 16 1a Adding Filtering Configuration For example assume that a rule has been defined as TCP Po...

Страница 89: ...have selected Single you only need to enter the specific source IP address in the From field Destination Port Three values are possible for this field Any Range or Single If you have selected Any you...

Страница 90: ...1 Select the required rule on the Select to Edit column 2 Click on Edit button to activate the action 3 Click Apply button to accept the rule or cancel button to discard the rule 4 To save the rules...

Страница 91: ...home or sales personnel who are mostly away from the office As long you have Internet access at your Remote site you can still manage your network To enable remote management 1 Select Remote managemen...

Страница 92: ...he System Identity Figure 18 1a System Identity Description To do so 1 Go to System Identity at the Command window 2 Description on the System Name System Contact You may enter the contact person for...

Страница 93: ...tions NOTE To manage and utilize the time based functions provided in the Compex WP11B such as the Filtering functions you MUST set its clock to synchronize with your managing workstation 1 Access the...

Страница 94: ...wse button to locate the filename Next click on the Upgrade button to begin the upgrading to the latest firmware revision Follow through the instructions during the upgrading process Once completed re...

Страница 95: ...on on a file restore the configuration from a file and reset the configuration back to factory default The Save and Reset Settings allows you to execute the changes or reset the Compex WP11B back to t...

Страница 96: ...ing on this button you will restore Compex WP11B back to the default settings This includes disabling the DHCP Server You will have to re enter all the configuration information for your network 18 5...

Страница 97: ...itive and only ONE password is Needed for all the interfaces Figure 18 6a Changing of Password 1 Click on Change Password at the Command window and key in the entries accordingly 2 Click on the Change...

Страница 98: ...ure 18 7a System prompt to log in again NOTE Do not use the Logon button use uConfig program instead to prevent any conflict in IP Address 18 8 Exit uConfig Upon completion of the Compex WP11B configu...

Страница 99: ...Chapter 18 Using SYSTEM TOOLS menu 89 Figure 18 8a uConfig icon at the taskbar uConfig icon will disappear after clicking on the ExitUconfig bar...

Страница 100: ...menu 90 Chapter 19 Using HELP menu 19 1 Get Technical Help For more information on Compex s technical support around the world click on the Get Technical Support in the HELP Menu Figure 19 1a Technica...

Страница 101: ...Compex WP11B by clicking on the About System menu After you have upgraded your firmware in the Compex WP11B you can check for the version 19 2 1 AP Bridge AP Client Wireless Bridge Link Mode Figure 1...

Страница 102: ...y The AP Mode LED will then light up steadily indicates that Compex WP11B has set to its factory default setting as shown below Operating Mode AP Bridge mode IP address 192 168 168 1 Password password...

Страница 103: ...Chapter 20 Hardware Reset of Compex WP11B 93 This page is intentionally left blank...

Страница 104: ...Chapter 20 Hardware Reset of Compex WP11B 94 This page is intentionally left blank...

Страница 105: ...s been pre configured with IP address and Subnet Mask of 192 168 168 1 for AP Bridge and AP Client mode and 255 255 255 0 respectively An Internet browser can be used to configure the Compex WP11B The...

Страница 106: ...selected Then click the Open button In Internet Explorer 1 Select the File menu then select Open 2 In the Open Page dialog box key in the IP address of the Compex WP11B This address is set at the fact...

Страница 107: ...be added to your network folder To configure your TCP IP connection for Compex WP11B please follow the steps listed below If you are using Windows 2000 XP please go to section AII 2 AII 1 Adding TCP I...

Страница 108: ...If TCP IP is not installed click on the Add button to start the installation 4 Select Protocol and click on the Add button Figure A11 2 Select Network Component Type 5 Select Microsoft and TCP IP in M...

Страница 109: ...t of Network Components 7 Click on the Properties button and configure the settings in each of the TCP IP Properties window Figure AII 4 Select TCP IP protocol Figure AII 5 IP Address Configuration NO...

Страница 110: ...l a network card As such only the configuration for TCP IP is shown 1 From the Start menu click Control Panel then click Network and Internet Connections Then click Network Connections and your comput...

Страница 111: ...ck on the Properties button Figure AII 8 IP Address Configuration 4 Configure your IP address and the rest of the parameters so that you can connect to the network NOTE Please check with your system a...

Страница 112: ...ddress 192 168 168 1 is the default IP address If your network is using other IP address other than default IP address please change the IP address in the above command You will see a prompt asking yo...

Страница 113: ...dix III Configuration and Commands on Telnet Interface 103 AIII 2 Command Line Interface Commands List Command Examples ping d d d d show ip show ip stat show ip routing table show arp table show icmp...

Страница 114: ...ommand Examples show udp stat show tcp stat show ethernet address show gateway set gateway d d d d There are also some other commands such as set ip private d d d d d d d d set ip lan d d d d d d d d...

Страница 115: ...1B and the other end to your PC notebook LAN adapter 3 Power ON the device and the PC notebook You will notice that the DIAG LED blinking rapidly This indicates that the loader mode has discovered fir...

Страница 116: ...ce as data is being transferred Please note that your firmware image file might be different Please enter the name of that image file Please ensure that there is constant power supply to Compex WP11B...

Страница 117: ...as obtained an IP address and other TCP IP properties like DNS address from the router 5 Click START RUN and type the command WINIPCFG and press the Enter key From the IP Configuration box select the...

Страница 118: ...ace 108 you still have problems connecting with a browser this is more likely your Internet browser configuration issue Check and remove any proxy setting in the Web browser application as shown Figur...

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