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

Painting PDF417 in C# 2: Internet Networking

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2: Internet Networking
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Part 2: Internet Networking
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note If an entry written to the log file has no applicable information for a field, a hyphen (-)
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is placed in the field instead.
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Table 5-1. Information Recorded in the ICF Log File ICF Log Field Explanation
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Date Time Action Indicates the date when the action took place; listed as year, month, day. Indicates the time when the action took place; listed as hour, minute, second. Lists the action that took place, such as open, close, drop, or info-events-lost (which refers to a number of events that took place but were not recorded in the log). Lists the protocol that was in use for the connection, such as TCP, UDP, ICMP, and so on. Lists the source IP address of the computer that attempted the communication. This can be your computer or a computer on the Internet. Lists the destination IP address, which is the destination of the communication sent by the source. This can be a computer on the Internet or your computer. Indicates the source port that was used by the source computer. The port number can range from 1 to 65,535 and is only recorded for TCP or UDP protocols. Indicates the port used by the destination computer. This is also either a TCP or UDP port ranging from 1 to 65,535. Indicates the size of the packet in bytes. Lists control flags in the header information of a packet. Common flags include Ack (Acknowledgment), Fin (no more data from sender), or Rst (reset). This field and the ones that follow are included for completeness, but they require a greater knowledge of TCP/ IP to be useful. Search the Internet for RFC 793 to learn more about TCP/IP headers. TCPsyn Notes the TCP sequence number of the packet.
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Protocol Src-IP (Source IP)
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Dst-IP (Destination IP)
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Src-port (Source Port)
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Dst-port (Destination Port) Size TCPflags
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2: Internet Networking
5: Using Internet Connection Firewall
Table 5-1. (continued) ICF Log Field
TCPack TCPwin ICMPtype ICMPcode Info
Explanation
Notes the TCP acknowledgment number in the packet. Notes the TCP window size (in bytes) in the packet. Notes the ICMP type field number, if an ICMP message. Notes the ICMP code field number, if an ICMP message. Contains information about the type of action that occurred, if applicable.
Using the ICF Log as Big Brother If several people use the Windows XP computer on which you have enabled ICF, you can use the ICF log file as a way to sample what other users are accessing on the Internet. ICF records one log file on the computer regardless of which user is accessing the Internet, so you can monitor all traffic using the single log file. Bear in mind that the ICF log is not designed as a snooper program, but it can be used to find out which Web sites have been accessed over the ICF-protected connection. If you are so inclined to know, follow these steps:
1 Log on with an account that has administrative privileges. 2 Ensure that the firewall log has been configured to log successful connections. 3 Open the firewall log. Locate an open connection and copy its destination IP
address.
4 Open Internet Explorer or another Web browser, paste the destination IP
address into the Address bar, and press Enter. you know which Web site was accessed.
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5 The browser will resolve the IP address, and the Web page will appear. Now 6 For additional security, place the firewall log into an encrypted folder to
make sure other users cannot access and modify it. Also, anyone else logged on with an administrator account (including anyone who uses the computer while logged on under your administrator account) can turn off the log if they know how. They can then surf and turn the log back on afterward.
2: Internet Networking
Part 2: Internet Networking
Enabling Services
Because ICF blocks all incoming communication that is not explicitly requested, some services will not work with ICF unless you make further configurations. For example, if you are hosting a Web site on your computer and users try to access your Web site, the packets arriving at your computer will be dropped because they were not solicited. Or, if you want to access your computer from a remote location using Remote Desktop, ICF will not allow the communication because it is not solicited. Because the blocking functions of ICF by default affect all protocols and ports, you might want to override the ICF behavior for certain services so that they will work with ICF. To enable a service to work with ICF, follow these steps:
1 Open Network Connections. 2 Right-click the ICF-protected connection and choose Properties. 3 Select the Advanced tab and click the Settings button. 4 On the Services tab, shown in Figure 5-4, select each service that you want
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