C# Network Programming

Using Raw Sockets Because ICMP packets do not use either TCP or UDP, you cannot use either of the socket helper classes, TcpClient or UdpClient. Instead, you have to use what are called raw sockets, which are a feature of the Socket class. R...

Creating an ICMP Class As just mentioned, the raw socket does not automatically format your ICMP packet, so you must do this yourself. C# is an object-oriented language. It makes sense to create a C# ICMP class that you can use to format an ...

A Simple Ping Program The first ICMP application program discussed is a simple version of the ping program that is found on almost all network devices. Ping is an important and fundamental diagnostic tool that tells you whether a network dev...

An Advanced Ping Program SimplePing was designed to demonstrate the basics of using the ICMP Echo Request/Reply sequence to ping a remote host. If you have used commercial ping products, you know that several features of such programs were...

The TraceRoute.cs Program A close cousin to ping is traceroute. The traceroute program sends an ICMP Echo Request to a remote host, but with a twist. To determine what routers the ICMP packet travels through to reach its destination, trace...

The FindMask Program The FindMask program uses another ICMP message type to automatically discover the subnet mask of the subnet the device is connected to. This section describes the ICMP Subnet Request packet type, along with the FindMask....

Summary This chapter shows how to create programs that utilize the Internet Control Message Protocol (ICMP). ICMP allows a network device to quickly send queries and error messages to other network devices. Many types of ICMP packets can be ...