Using IP addresses from IP pool given by ISP

  • My ISP says that it can provide an optic fiber connection with a pool of 4 static IP addresses (subnet 255.255.255.248 i think).
    My question is that if I get that connection,
    1 ip will be used for network
    1 for default gateway
    1 for broadcast.
    So I will get only 1 usable ip address, while other internet plan have only 1 static ip address and cost less. So what is the benefit of pool of 4 ip?

    EDIT

    netmask would be 255.255.255.252

    Did any answer help you? if so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you could provide and accept your own answer.

  • Ricky

    Ricky Correct answer

    8 years ago

    This depends on exactly how the ISP provides them to you. You may have "4 DHCP addresses", a "routed" /30, or a "connected" /29.

    For example, Time Warner Cable (business class) allows 4 devices to use DHCP to get an address. (similar to residential service that's limited to one)

    "routed" is what you'd see where you have a WAN side and LAN side. This is the traditional "lease line" model where the T1/DS3/etc. ISP side has an independent address to which the static address block is routed; from there they can be assigned as a LAN or NAT'd individually (the firewall situation Bulki mentions.)

    "connected" would be where the ISP provides your LAN (i.e. a data center, or the "routed" example where you don't control the router)

    Thanks for the answer. Can you please provide a link from where I can get information about these 3 types of connections.

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Content dated before 7/24/2021 11:53 AM