By Regis Sbudd J. Bates
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Example text
The process repeats itself. Clearly, if we do this once per day, then old or invalid routes will remain in the table for at least a day. The more dynamic we want our network to be, the more often we should do the update. Unfortunately, this consumes lots of network bandwidth when done too often. Every half a minute (30 seconds) to a few minutes seems to be a reasonable range. The irony here is that larger networks have a greater probability of something changing so they have to do it more often than smaller networks.
0 address. This address is “illegal” on the Internet. 0 address in a packet will simply discard that packet. 64347_CH29x 12/6/01 4:11 PM Page 517 The Internet 517 address that we can subnet any way we want. Our firewall still must do NAT because it is not polite to send garbage packets out on the Internet. CompuServe and AOL use NAT between their internal address scheme and the real Internet. DHCP, BOOTP, ARP, RARP The next dynamic addressing scheme is that used by most ISPs. They don’t have enough addresses to be able to give a real Internet address to every subscriber.
It therefore makes it that much harder for them to hack into our network. With a properly configured firewall, it is almost impossible anyway. There are some obvious limitations. Namely, that we could theoretically only have 254 folks surfing the Net at one time. If this is a serious limitation, another Class C address is requested from the ISP or the InterNIC. Back to preventing havoc on the Internet. 0 address. This address is “illegal” on the Internet. 0 address in a packet will simply discard that packet.