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  1. #1
    Join Date
    Oct 2011
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    Default 2 Public IPs (Static and Dynamic)?

    Right, I have a question(s) - this is what I have done.

    [o2 wireless box (bridge mode)]
                     |        |
           [router 1]    [router 2]
    o2 wireless box is in bridge mode, I have router 1 configured with a public static IP and router 2 set to DHCP. Router 2 picks up a public IP via DHCP. Both router/public IP address seem to work and can connected to the internet at the same time.

    My questions are:

    1. Should I be able to do this?
    2. Should this work (it does, so I guess I already answered that)?
    3. Why does this work?

  2. #2
    Join Date
    Oct 1999
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    I'm not familiar enough with O2's routers or your specific setup/kit/details to have a clear answer for that, although O2's network is based off BE Broadband's platform and they sell packages that can cope with multiple IP's (static and dynamic) so it follows that some of O2's services would have similar flexibility.

    You can have more than one IP per physical internet connection, just as you can assign different IP's to multiple different computers from your router. The details of how this works depends on your software and hardware so that's not something we can dig into.
    Mark 'Winter' Jackson
    Editor-in-Chief - ISPreview.co.uk

  3. #3
    Join Date
    Oct 2001
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    Where did you get the "static ip" details that you have configured in the "static" router?
    If it was a previously given DHCP address that you had, it will become intermittent in <insert number of weeks here> when another customer is assigned the IP.

    I did this when I first joined BE it will work for a while but it isn't reliable and will cause problems for you and another customer. Don't do it.

    If you are a Static IP customer and o2 sent you details of your static IP and gateway etc.. then this is very strange.

    Tom - www.mouselike.org

  4. #4


    Its not strange a static IP customer of BE at least can actually even change their IP, providing you have a modem and router that allows you to manually configure default gateway address and subnet mask. (you will have to know the various different gateway addresses BE use up and down the country).

    Not sure if it works on O2. BE technically to the letter of what a static IP actually is have no such thing.

    Example you can live in Scotland and go through the Scottish gateway (say which is Glasgow) by default but you can reconfigure things to go through say a London gateway (example and thus poach an IP from that London gateway. While keeping your so called static IP they assigned you valid on the Glasgow gateway.

    You can also change IP on BE if you are a so called dynamic customer just by changing the MAC. You can alter your so called static IP just by configuring the same details as they sent you but altering the default gateway and subnet mask addresses.

    I suspect this is and always has been set up wrong BE end, which would also explain why some BE boxes cant talk directly to others, as their is no real static address assigning.

    A dynamic IP customer can actually if they wanted hijack a whole range of IP addresses (if they had enough routers) for a few hours at a time, forcing whole areas into not being able to connect, which by default on a dynamic IP go for the nearest BE gateway. Not a clever setup.

    A static IP customer can have as many (technically again though you would need alot of gear) IP addresses as there are default gateways on the BE network. (probably around 1-200 at a guess).

    The whole way BE have their network setup and configured is flawed, you can in some cases even half your latency at specific times by forcing the connection through a different default gateway on their network. Then again it comes as no shock, the amount of issues they constantly have with routing that their network configuration is screwed up.
    Last edited by truth4free; 25-04-2012 at 12:27 AM.

  5. #5
    Join Date
    Aug 2011
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    This is quite a normal ISP model

    BE use VPLS as do a lot of other ISP's



    Whether it is configured and managed correctly is another matter, but the design is at source perfectly legitimate


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