Re: [LUNI] Can ISP's detect NAT usage?

From: Jason A. Partyka (jpartyka@students.depaul.edu)
Date: Thu Mar 29 2001 - 22:13:54 CST

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    On Thursday 29 March 2001 18:08, jeff@gerhardt.org wrote:

    > and theoretically you can poll a DSL router set up for DHCP for the number
    > of active leases. But the vast majority of ISPs have way to much to do to
    > worry about crap like that.

    But how would this allow the ISP to poll for NAT? Here's my frame of
    reference:

    I have telocity (not with Northpoint thankfully!) and NAT is allowed on their
    network. But that aside, my setup is akin to this:

    DSL "modem" <-> Gateway/NAT router/firewall <-> LAN (using static IP in a
    private block)

    Telocity's setup is that a DHCP server in the "modem" dishes out the assigned
    IP address. I presume this is to make things easier for the masses. Anyway,
    the gateway is the machine that takes the lease. No other machine on my home
    network has a lease.

    The only way I can think of is if the DSL "modem" has NAT built-in.
    Telocity's "modem" does but you have to pay an extra $10 a month for it,
    which is once again, an option for the masses.

    -Jason
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