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Step 1 The client-side TCP first sends a special TCP segment to the server-side TCP This special segment contains no application-layer data It does, however, have one of the flag bits in the segment's header (see Figure 33-2), the so-called SYN bit, set to 1 For this reason, this special segment is referred to as a SYN segment In addition, the client chooses an initial sequence number (client_isn) and puts this number in the sequence number field of the initial TCP SYN segmentThis segment is encapsulated within an IP datagram and sent into the Internet Step 2 Once the IP datagram containing the TCP SYN segment arrives at the server host (assuming it does arrive!), the server extracts the TCP SYN segment from the datagram, allocates the TCP buffers and variables to the connection, and sends a connection-granted segment to client TCP This connection-granted segment also contains no application-layer data However, it does contain three important pieces of information in the segment header First, the SYN bit is set to 1 Second, the acknowledgment field of the TCP segment header is set to isn+1 Finally, the server chooses its own initial sequence number (server_isn) and puts this value in the sequence number field of the TCP segment header This connection granted segment is saying, in effect, "I received your SYN packet to start a connection with your initial sequence number, client_isn I agree to establish this connection My own initial sequence number is server_isn" The conenction-granted segment is sometimes referred to as a SYNACK segment Step 3 Upon receiving the connection-granted segment, the client also allocates buffers and variables to the connection The client host then sends the server yet another segment; this last segment acknowledges the server's connection-granted segment (the client does so by putting the value server_isn+1 in the acknowledgment field of the TCP segment header) The SYN bit is set to 0, since the connection is established.

Before relying on ping tests, test your operating systems to see how they transmit or don t transmit packets on the network Also, choose your source well, using a well-run, rarely changed machine as a known, clean, starting point One machine that tends to be very reliable in almost any network is the home machine of a system administrator Unlike the oft-mentioned shoemaker (whose children always.

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The process of writing a book, especially a non-fiction text, is changing -- the author must consider providing web-based resources as seriously as adding an appendix. Whether these online resources are a list of links, text corrections and updates, or providing a full, searchable online text depends on the nature of the book, but it's clear that at least some level of support and information beyond traditional paper publishing is becoming necessary and hopefully through example, the Securing Java site will help clarify this importance. We hope you find the online version of Securing Java a useful supplement to the physical edition. We invite you to show your support for the effort put into the online version by purchasing the book.

Once the following three steps have been completed, the client and server hosts can send segments containing data to each other In each of these future segments, the SYN bit will be set to zero Note that in order to establish the connection, three packets are sent between the two hosts, as illustrated in Figure 35-10 For this reason, this connection establishment procedure is often referred to as a three-way handshake Several aspects of the TCP three-way handshake (Why are initial sequence numbers needed Why is a three-way handshake, as opposed to a two-way handshake, needed ) are explored in the homework problems

have the worst shoes), most system administrators make their machines among the most reliable ones on the network. Another good testing device is a network router, they seldom fail. In the case of a switch or router failure, attempts to manage the device will fail, giving you an additional clue as to the location of the fault. Your first responsibility, however, is to get critical hosts connected to some well-conditioned network, so it s fair to lump all of these physical failures together under the same detection umbrella. Physical failures are usually addressed by switching to a redundant network connection, and can often be handled on a host-by-host basis. One host s NIC failure does not impact others. This is, of course, the easy case. The harder problem is when you have to get several machines to change their configurations at the same time.

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Ryan MacMichael is the Webmaster at Reliable Software Technologies in Sterling, VA, and designed the online version of Securing Java. He has been previously published in BBS Callers Digest and spends too much of his spare time on perhaps the world's largest personal Web site. You can reach Ryan with any problems or comments at rmacmich@rstcorp.com.

In this section, we take a quick look at the things that can go wrong with computer systems and that can cause downtime. Some of them, especially the hardware ones, may seem incredibly obvious, but others will not.

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