(Get the TCP/IP facts at
http://www.networksorcery.com/enp/protocol/
tcp.htm
and
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ip.htm
.)
The ways in which networks use TCP/IP does complicate matters. The same protocol that connects
machines on the network can also connect you to any machine worldwide on the Internet.
Because TCP/IP is found everywhere, you can??™t rely on technology differences to protect your network
??”you have to assume that anyone can access your network unless you provide roadblocks to
that access.
In addition to the broad usage that TCP/IP enjoys, the protocol also appears on most platforms.
Unfortunately, each platform seems to have its own little oddities in dealing with TCP/IP. As
an administrator, you need to know how to deal with these oddities. This chapter reflects the
Server Core manner of working with TCP/IP, which may not reflect the Linux or Macintosh use
of TCP/IP precisely.
NOTE
You??™ll find differences in the way that various versions of Windows handle TCP/IP. The
differences are subtle. For example, an older version of a utility, such as one found in Windows
2000, may not include support for Internet Protocol Version 6 (IPv6).
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