From: Seth Rothenberg (srothenb@montefiore.org)
Date: Thu Nov 14 2002 - 10:56:22 EST
Greetings.
I searched and found a discussion about which IP address ranges
to use for private networks - and I found the information
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
but my question about individual systems on a corporate LAN.
My network engineering colleagues here broke my dialin by
moving it from a 192.168.1.0 to 192.168.5.0.....
What broke?
Well, the backbone is 10.0.0.0, and my hosts are
multi-homed (isn't everyone running a Heartbeat network?)....
and the HB network is 192.168.5.0.....
so, when they changed it, the packets got to my host from 192.168.5.20,
but my host knew (via arp table) that this network was out on the private
network,
not on the LAN, so the packets could not go back.
When I told them 192.168.x is a private address and has no place on the LAN,
they said, the whole 10 is private and they are in control and need to know
everything that goes on. I maintain that using the 10 as the "public"
network
does not automatically make the 192.168 also part of the public network.
I'd like to hear what (especially) net eng folks do on their nets.
PS, once I knew what the problem was, I just telnetted into a box
that is not on my private LAN, and then telnetted across.
Thanks
Seth
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