13 Oct
2011
13 Oct
'11
4:41 p.m.
At 10:43 AM 10/13/2011, you wrote:
At 10:05 AM 10/13/2011, Dennis Boone wrote:
Um, this boy is on ATT DSL and plugged my 16-port
10/100/1000 Netgear switch right into my
AT&T-supplied DSL modem widget and voila! All
the internal IP addresses one could ever want. I
even have a Linux server handing out a different
range of addresses and there's no interference--
the DSL modem gets there first.
grievous misunderstanding of the common "one
external IP address"
service. The device will hand you more than one internal IP. If it's
equipped with one port and not doing NAT, then it is expecting you to
supply a firewall device, not to plug directly into it. The firewall
device will then do NAT and hand you multiple internal addresses.
Yeah, well, the modem will still only bind to one MAC address until you
power-cycle them, and they'll still only hand out one address via
DHCP, and it'll be a 192.168.1.xxx. Go figure. This is true for
the ATT DSL and Charter Cable modems I see in my area. Arguably it simplifies the situation for the one modem,
one computer
user. It doesn't let you simply add a switch to connect multiple
devices. It lets the ISP upsell the consumer to a four-port
combo firewall/router/wireless/modem.
A very large number, a majority I would guess, of
DSL modems and cable modems have an internal DHCP
server to hand out IP addresses and keep track of
them. I have quite a selection of old Lucent
types, Actiontec, and many other kinds from
previous ISPs and those that were given to me.
They all seem to have most of the features a
router should have, except that the firewalls in
some of them are pretty weak and not very flexible.
Of course, my experience is limited to the
mid-West and the cable and DSL providers one finds hereabouts.
Even if you buy the business-class small-set-of-statics
service,
I've yet to see either ISP properly deliver and configure a modem
that actually hands out those real statics. At that point they
figure you're either smart enough to do it yourself, or smart enough
to demand that the installer do you a favor. After all, there's still
the option of whether you want it to use DHCP to do it.
How did we get onto a discussion of static
addresses? That's on the outside of your network,
and yes, the ISP has to provide it and yes they
will charge you a bunch of money for it. I used
to have one, for many years, until they proposed
raising the rate beyond what I found reasonable.
If you want static IP addresses inside your
network, that's fine, do it. Just manually
configure the address, mask, and gateway on each
device, and off you go. Even on the printer,
there's ways to do it, using the buttons, or
using the menu to print the current address, then
using a web client or telnet to that address.
- John
967 . Computers make it easier to do a lot of
things, but most of the things they make it
easier to do don't need to be done. -- Andy Rooney
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