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 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?


    netmask would be

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  • 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