bar code printing in vb.net 2: Internet Networking in C#

Encoding PDF-417 2d barcode in C# 2: Internet Networking

2: Internet Networking
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Figure 4-12. You can access the modem configuration, phone number, and dialing rules from the General tab.
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On the Options tab, shown in Figure 4-13, you can configure several dialing and redialing options. These settings are mostly self-explanatory, but notice that the Idle Time Before Hanging Up value is 20 minutes by default. Even if you have the modem configured to not hang up after a set amount of idle time, the connection settings will still be invoked. Therefore, if you want to make certain that you are never automatically disconnected, select Never from the Idle Time Before Hanging Up list. Then, open
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4: Configuring Internet Connections
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Phone And Modem Options in Control Panel. Select the Modems tab, select the modem, and click the Properties button. On the Advanced tab, click the Change Default Preferences button and clear the Disconnect A Call If Idle For More Than option.
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Figure 4-13.
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Configure dialing and redialing options on the Options tab.
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The options on the Security and Networking tabs typically apply to dial-up connections to a corporate network, such as a VPN connection, although some ISPs are now requiring secure authentication methods. You can learn more about the configuration options on the Security tab in 20, Using Security, and the configuration options on the Networking tab in Configuring IP Settings in Windows XP, page 35, as well as in Other Networking Protocols, page 42.
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caution
The default security settings for Internet connections use the Typical (Recommended Setting) on the Security tab, which uses unsecured passwords. Do not change the settings on the Security tab unless the instructions from your ISP specifically tell you to do so. Incorrect edits to the Security tab will prevent you from being authenticated by the ISP s servers.
On the Advanced tab, you can turn on Internet Connection Firewall, which you can learn more about in 5, Using Internet Connection Firewall, and you can use ICS, which you can learn more about in Using Internet Connection Sharing, page 301.
2: Internet Networking
Part 2: Internet Networking
You need to solve common dial-up connection problems. Users who rely on dial-up connections can suffer from a number of different problems because they have to connect to the ISP each time they wish to use the Internet, and because of possible connection problems over phone lines. The following are some common problems and solutions: G My dial-up connection keeps disconnecting when I am not using it. If the connection is automatically being terminated, take a look at the Idle Time Before Hanging Up setting on the Options tab of the Dial-up Connection Properties dialog box. Also, be aware that many ISPs automatically disconnect idle users after a certain time period to conserve their resources. G My connection is slow. If the Internet connection is slow over the modem, it is normally a problem with the ISP s connection to the Internet or a limitation of your phone lines. Verify the speeds you re getting over your dialup connection by examining the connection s properties after you dial up. If they re slow, you might have noisy phone lines in your house (or between your house and the nearest fiber-optic connection). Also, contact your ISP to determine the amount of load being placed on its Internet connection. G My connection always tries to dial a 1 in front of the number. Right-click the dial-up connection, choose Properties, and on the General tab, change the phone number settings. Or, if you are using dialing rules, change the dialing rule configuration so that it recognizes the phone number or area code as local. See the next section for a discussion on dialing rules. G I am prompted to approve the phone number every time the connection dials. Right-click the dial-up connection, choose Properties, and select the Options tab. Clear the Prompt For Phone Number check box. G I have a number of connection problems on a regular basis. If you have a number of connection problems, including dropped connections, you might need to use some additional initialization commands for the modem. See your modem s documentation for details. Also, try opening Phone And Modem Options in Control Panel, select the Advanced tab, click the Advanced Port Settings button, and adjust the FIFO buffer settings. If none of these suggestions work for you, it s possible there might be a fundamental incompatibility between your modem and the ones being used by your ISP. Contact your ISP for recommended modem brands as well as tips on how to make your modem connect properly to the ISP s modem.
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