In 1988 I set up a private LAN in my home office consisting of
two Sunmicrosystems workstations. Following the example in the Sun
documentation I used the network IP address 188.8.131.52. Since then,
the network has grown to 6 devices, but connection to the outside world
(the internet) has been only through a single computer using a dial-up
modem and PPP. This setup has worked fine.
Recently cable broadband service has become available in my area and
will soon be installed in my home office. I have purchased a Cisco 806
router to interface my private LAN to the cable modem. My
understanding is that the ethernet 0 port of the router should be
assigned a unique address on my 184.108.40.206 LAN, say 220.127.116.11, and
that the ethernet 1 port connected to the cable modem should be set up
for dynamic addressing provided by my cable company IP provider.
Routing concepts are new to me but my impression was that the router
would keep my private LAN addresses from being seen by the outside
world (the internet) yet I have read that on my private LAN I should
only use IP addresses from one of the private address blocks, say the
192.168.0.0 through 192.168.255.255 block, else the router may get
Is this really true? Must I change the IP addresses of the devices on
my private LAN to something like 192.168.200.xxx?
Thanks for your help.