From: Jeff K. (jeffbk@xxxxxxxxxxxxx)
Date: Thu May 17 2001 - 12:22:43 GMT-3
Out of curiosity, how do you all keep getting 65 million? To me, 2 to the
24th power is 16 million (16777216 to be exact).
-Jeff
----- Original Message -----
From: "Walter Chen" <wchen@iloka.com>
To: "'Andrew Lennon'" <andrew.lennon@nscglobal.com>; "Bruce Williams"
<bruce@williamsnetworking.com>; <ccielab@groupstudy.com>
Sent: Thursday, May 17, 2001 10:16 AM
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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