Being five days late on this you have probably already solved it, but
just in case....
The CB3 will request a DHCP address with it's MAC address (assuming it
is set to DHCP). When the PC or router behind the CB3 requests a DHCP
lease you will see the MAC for that device. The DHCP REQUEST message
actually contains the MAC address it is requesting an IP for, it is not
just assumed to be the MAC address that is seen making the request. The
biggest issue I could think of with this setup is when the customers
device changes (new router or NIC) they will have to call into the NOC
and the DHCP assignment will have to be changed.
Sam Tetherow
Sandhills Wireless
David E. Smith wrote:
As part of the ongoing (does it ever stop?) efforts to make a Better
Network, I've finally started using private subnets where appropriate.
I'd love to be able to better automate some parts of my network, though,
and I'm not sure how to do both of 'em at the same time. (Right now,
substantially our whole network uses static IP assignments everywhere,
and that's not really viable long-term.)
My ideal scenario would be something like this:
* The AP runs a DHCP server and talks to a RADIUS server (that's easy)
* When a client associates, do a RADIUS lookup to see if they should be
allowed to associate (that's easy too)
* Give the CPE an IP address from one subnet, then give "whatever else
is there" an IP from a different subnet (that's the tricky part)
This is made even more complicated by the fact that many of our CPE are
Senao CB3 units, which do MAC cloning and I don't think you can turn it
off. (Basically, both the CPE and the customer's router, or whatever,
show up in my tower as having the CPE's MAC.)
If I weren't trying to conserve public IP space, this would be easy
enough - just give the CPE one IP address and the customer's gear a
second one. But there's really no reason for my radios to be visible to
the public Internet, and it's wasteful of those sweet sweet IPs.
I know there's a solution to this problem, because that's basically how
most cable modem setups work. (Annoyingly, I can't get my company's
wireless Internet at home, so I've got cable modem there.) The cable
modem is a bit "smarter" than a CB3, though, thanks to DOCSIS. I'd like
to do all this at the tower, instead of having to buy (or invent) new
CPE if possible.
Is this even possible?
David Smith
MVN.net
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