What you don't seem to understand is that cable modem customers are
connected 24x7. @Home does use DHCP, but the address almost never
changes since DHCP is designed to keep assigning the same address to
the same host as long as possible. Think of them as pseudo-static.

If you are connected by dial-up, you only need an IP address while
dialed in. With a permanent, 24x7 link, you need a permanent, 24x7
address. Even if it changes, there is always an address assigned.

Being on a cable modem is effectively the same as being on a T1
(although it's a bit faster in one direction).

R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: Phone: +1 510 486-8634

If this is the case, then all of the mid to large size ISPs should be able
to justify a whole bunch of new space based on DSL customers... They are
always connected so they can have a full time address too, whether through
static or DHCP...


Yes, they should be able to (assuming proper utilization percentages, etc.

Or is ARIN going to say NO, you can't have 1000 addresses for your 1000
customers all of whom have their address "in use" 24x7 and force ISP's to
use IP Masquerading at the ISP level to service all their dedicated customers.

Heh. At that point, we'll just assign each ISP *ONE* IP address, and demand
that they make it work beyond that point on their own. :slight_smile: Should make
routing tables significantly easier to manage.


Yep, and most ISPs charge for the static block these days. There is no
difference between static and dynamic address if it's on all the time.
However, dynamic IPs for workstations make renumbering easier. You can't
allow it for servers though.