From: Walter Chen (wchen@xxxxxxxxx)
Date: Thu May 17 2001 - 12:45:34 GMT-3
Yes. You're right. It is 16 million instead of 65 million. I was confused
on top of my head with a class B of 65k and class A of 16M. Thanks for the
correction.
-----Original Message-----
From: Craig Hammer [mailto:Craig.Hammer@Parago.Com]
Sent: Thursday, May 17, 2001 11:37 AM
To: ccielab@groupstudy.com
Subject: RE: Using Public Addresses Internally
Walter, I am pretty sure that one class A contains 16 million addresses.
-----Original Message-----
From: Walter Chen [mailto:wchen@iloka.com]
Sent: Thursday, May 17, 2001 10:16 AM
To: 'Andrew Lennon'; Bruce Williams; ccielab@groupstudy.com
Subject: RE: Using Public Addresses Internally
Bruce,
One Class A such as 10.0.0.0/8 contains 65 million addresses. With all kinds
of subletting, you can still get millions of addresses out of just one Class
A. Then you can use the 172.16.0.0-172.32.0.0/16 Class B private space
which has about a million addresses. I guess any single business won't need
more than a few million addresses all at once. Besides, you can NAT one
private space into another private space (say for local subnets, use
192.168.0.0/16, and NAT them into 10.0.0.0/8 for national use), then you can
have 65 million NATed subnets each may contain up to a million addresses.
So, you can use the current private IP scheme to create a few trillion
addresses for internal use. If this is still not enough, you may THEN
consider using public addresses.
Walter
-----Original Message-----
From: Andrew Lennon [mailto:andrew.lennon@nscglobal.com]
Sent: Thursday, May 17, 2001 10:19 AM
To: Bruce Williams; ccielab@groupstudy.com
Subject: RE: Using Public Addresses Internally
Bruce,
A couple of things spring to mind:
Use the RFC1918 address 10.0.0.0 /8. This is "class A" so you will have the
amount of adresses compared to using a globally routable address.
If you use an address range in use elsewhere, then you are heading for
problems if you ever wish to connect to the net.
Say your organisation uses the address 47.0.0.0/8, and your routers point to
adresses in this range to base stations etc. What happens when someone in
your organisation wants to connect to an address where the legitimate
address is 47.1.1.1? Your routers will route towards a base station and not
the correct host and vice versa.
I know you say that there will not be a direct Internet connection, but you
never know what the future may hold....
There is no real reason or excuse not to use the 10/8 range, after all it
was set aside for use exactly for things like your organisation's
circumstances. Even if 10/8 is already in use at your place, I am sure that
you would be able to use a subset of it in your grand scheme.
Andy
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Bruce Williams
Sent: 17 May 2001 14:56
To: ccielab@groupstudy.com
Subject: Using Public Addresses Internally
My company wants to use public addresses from the Class A range internally.
I
realize the danger if these routes got advertised on the Internet, but is
this
something that is considered acceptable if it is carefully done to prevent
the
risk of these routes being propagated out on the Public Internet? These
networks will be used to address equipment in a multitude of cellular radio
base stations around the country and they will only be connected to our
network. There will central locations where users from the internet could
access a database which will query these systems, but there will not be a
direct internet connection. I would appreciate any advice on this.
Thanks,
Bruce Williams
215-275-2723
bruce@williamsnetworking.com
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