ADVANTAGES

On the other hand, it's not as big a problem as many people give it credit for. Many ways of designing a firewall put a packet filtering router, built on a specialized, robust, and quickly upgradeable TCP/IP implementation, in front of any general-purpose computer in any case. In these designs, the router can offer some protection to Windows NT machines. Windows NT's TCP/IP implementation is also catching up rapidly, because problems with it tend to be extremely visible (once somebody's crashed a few hundred thousand hosts, people tend to take notice). It is painful to have to upgrade the operating system on your firewall, and the low-level TCP/IP is one of the most risky and painful parts to have to upgrade, so changes that come out after your machines are installed are not very comforting, but it is probable that most of the worst problems have been found already.

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