Textbook ErrataWed, Jan 22 2003, 8:45pm
This page contains corrections to the text book(s).
The errata below describes
the page of the error, and either the paragraph number, or line number
containing the error.
Negative lines numbers count from the bottom of the page.
Blank lines are not counted.
As you find additional errors or omissions not listed here, please let me know
and I'll add them to the list.
| Textbook Errata - TCP/IP Network Administration Handbook | |
| Official Errata |
The official errata for the TCP/IP Network Administration book is located at: http://www.oreilly.com/catalog/tcp3/errata/ There are several printings of this text book; you will need to look up your version of the text, and view there appropriate errata on the website mentioned above. |
| General Comment | The author uses the words delivered and passed to describe that a packet is sent to either a host or a gateway. These terms are figurative, and should not be taken literally. Packets are simply placed on the wire connected to an interface, with headers that contain destination addresses. The packets are picked up by any receptive network interface. In fact, many network interface cards on the network have the ability to receive such packets, but under normal operation, they reject packets whose destination addresses do not match their own address. This is analogous is talking in a room full of people - when you talk, usually only the people you are talking to listen - but everyone else around you can listen if they chose to do so. You can not really prevent others from hearing the conversation (provided you speaking loudly enough). |
| Pg 20 Line 2 |
The author says a connection is closed with a 3-way handshake. This is not fully accurate - TCP applications close with 4 segment exchanges, which is a modified form of the 3-way handshake. The client sends a FIN segment (finished sending), and the receiver accepts this segment and performs a passive close by sending back an ACK segment (acknowledge). When the receiver closes its own side of the connection, it sends a FIN segment back to the client, and TCP on the client side acknowledges with its own ACK segment. In total, there are 4 segments passed to close a connection, not three. |
| Textbook Errata - UNIX System Administration Handbook | |
| Official Errata |
The official errata for the Unix System Administration Handbook is located at: http://www.admin.com/Pages/Errors.html There are several printings of this text book; you will need to look up your version of the text, and view there appropriate errata on the website mentioned above. |