leased line - BT

Hi Guys,

I have just ordered a leased line for our business and I was asked by BT how many IP addresses I wanted. I asked the guy to explain what he meant and he went on a bit and then said that he thinks I would need 5.

Isn't a leased line in practice still just a internet connection entering a router? why would he need to know how many IP addresses I need. In addition to that, what IP addresses is he talking about?

can someone clarify this situation at all.

Best Regards
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peggiegregAsked:
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Chris MillardCommented:
With a leased line, you can have multiple PUBLIC IP addresses. Unlike an ADSL line where your the WAN side of you router has a single public facing IP address, with a leased line all traffic passes through the BT equipment to you and you assign public facing IP addresses to your own equipment.

We have multiple IPs on our leased line. One IP is assigned to a firewall that serves a student network, another on a firewall that serves the staff network, another that serves our DMZ etc....
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Dave BaldwinFixer of ProblemsCommented:
At the very least, it's the external IP address of the router.  It's needed to make a connection.  Both my ADSL modem and my Cable modem have their own external IP addresses.  You can't make a connection without an IP address.
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peggiegregAuthor Commented:
thanks this makes sense now
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Bryant SchaperCommented:
Another use as well is an HA model, for example on two cisco routers that each get a public IP and then using HSRP they share a floating IP.  Firewalls do the same.   Plus you could host internal services accessible from the internet, like web, vpn, rdp.  You may assign them to another IP instead of port forwarding off the main IP.
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