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For purposes of IP address conservation, we are now using private addresses,
as defined in RFC 1918, within the U of R networks.
Per RFC 1918, private IP addresses may be assigned to machines which will NEVER
be allowed to access the Internet. Examples might be printers, in-band
accessible network hardware, etc.
We have currently assigned 172.17.0.0, 172.18.0.0 and 172.27.0.0 to the Medical Center
for internal unrestricted use.
172.30.0.0 has been assigned for use by the rest of the University. Subnets
within 172.30.0.0 will be assigned to match the subnets currently
used within 128.151.x.x. In other words, if a network administrator
on the 128.151.214.0 subnet requests use of private addresses, an
address of 172.30.214.0 would be assigned.
We will only
add these to the DNS and routing tables on request since we want
to avoid adding a lot of extra and unused routing information on
the backbone.
Network administrators may request use of these addresses via email to hostmaster@utd.rochester.edu.
There are problems associated with use of private IP addresses. If a department is
using a caching DNS server, its users will not be able to resolve
IP addresses to host names for the private addresses. And, of course,
hosts configured with those addresses will not be able to access the Internet.
Note that 172.29.0.0 and 172.31.0.0 are being used by Networking and Communications Services (NCS) (formerly UTD) for address conservation in
wide area and point to point links.
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