Re: router setup query SBS

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Lanwench [MVP - Exchange] wrote:
Steve Moss wrote:
Lanwench [MVP - Exchange] wrote:

It's not unusual for a 'static' IP address at an ISP to actually be
a DHCP reservation, just as you might do when you want a
fixed-address SBS LAN client.
Hmmm. Sure, it's possible, but I've never run into that myself,
honestly. In order for this to happen, the ISP would first have to
know the MAC address of my firewall/hardware appliance (whatever I
was planning on connecting to their modem or router), wouldn't they?

With any of the ISPs I've worked with (from consumer to commercial),
it's always either a static (usually a block of at least 5) or it's a
regular dynamic "first come first served."
FYI, I've come across a number of ISPs here in the UK that do indeed
use DHCP reservations for 'static' IPs. Our Broadband supplier,
PlusNet, are a case in point. You can either configure your
router/firewall to the assigned static IP address, or you can set it
to dynamic, in which case the same address is delivered via DHCP upon
PPPoA authentication (the reservation is tied to the authenticated
session, not a device's MAC address). Indeed, they offer a standard
dial-up service as a backup. If you authenticate via a dial-up
connection, you are actually delivered the *same* IP address via DHCP,
too.

Ah. Interesting. I'm a bit glad I've never run into it in the States, though - I'm a control freak & like to know what I'm getting. But thanks for the info!


I'm on Demon in the UK, and have had the same IP address for about ten years, delivered this way. I could hard-configure it if I wanted to, but there doesn't seem much point. Any problem at Demon which caused the wrong IP address to be assigned would be likely to be serious enough to close access anyway. While they are not as competent as they were a decade ago, they still more or less know what they are doing.
.

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