Will this setup interfere the dhcp setup?

  1. EOF's Avatar
    EOF
    Posts : 59
    Win7 Ultimate
       #1

    Will this setup interfere the dhcp setup?


    Hi!
    If I have 2 wifi router on the same VLAN, Rw1 and Rw2 where on both of them the dhcp server is enabled with a pool:
    Rw1: ip range from 100 to 150
    Rw2: ip range from 151 to 200

    Situation:
    If there are PC's, laptops, tablet's, mobile phones are connected on Rw2 through LAN and Wifi and all the IP addresses from the Rw2 pool are used, will the next device, which will connect through wifi to the Rw2, get an IP address from the Rw1, even if the device is not connected to Rw1?

    How I understand this:
    There are 2 dhcp servers setup on the same VLAN.
    With different IP range in there dhcp pool's.
    Cos they are on the same VLAN , actually they would maybe react as one dhcp server
    with a pool range from 100 to 200.

    Because the two router's will broadcast through the same VLAN the IP addresses from their separated pools,
    and all devices connected to that VLAN can have any unused IP address between the range of 100 to 200,
    even if the pool's are actually set up in two separated Routers.
    Am I correct?

    Thank you.
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  2. Samuria's Avatar
    Posts : 6,451
    windows 10
       #2

    Are both routers in the same ip range and subnet? I your using the internet which is connected to the net and how will the second router give out the correct gateway? There is no9t a lot of point to this its normal to just have 1 router as dhcp
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  3. EOF's Avatar
    EOF
    Posts : 59
    Win7 Ultimate
    Thread Starter
       #3

    Yes. They are on the same ip range and subnet.
    The internet is also working. No problem.
    I found this setup yesterday in a company and I was shocked what this setup is meaning actually?

    But yes, it is there.
    I think somebody was extended the range of the wifi with two ruters and activated the dhcp in both router.
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  4. MaloK's Avatar
    Posts : 493
    Windows 7
       #4

    How are they connected to WAN ?
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  5. EOF's Avatar
    EOF
    Posts : 59
    Win7 Ultimate
    Thread Starter
       #5

    For now I don't know how they connected to WAN cos I found physically only one of them and that Rw1 was not connected to WAN, just to LAN.
    Maybe that Rw2 is also connected to LAN.

    I found out the mentioned situation when I accedentally checked the network setup one of the laptop which was connected to the Rw2 through wifi, but the IP address which was assigned to that laptop was from the Rw1 dhcp pool.

    BTW.
    The earlier system administrator passed away unexpected and now the company is without any IT guy who can help them overcome some basic issues etc.

    I found some writing from the earlier admin,and I could login to that two routers, the Rw1 and Rw2.
    Rw1 is some sort of TP-Link router.
    Rw2 is a Tenda router, so, nothing fancy.

    There is also a Cisco router which is holding the optical link through a media converter.
    That is the ISP link.
    No dhcp active in there.
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  6. MaloK's Avatar
    Posts : 493
    Windows 7
       #6

    One of the routers must be connected on both wan and lan somewhere. But it's a pretty strange way to extend a Wifi network indeed...
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  7. EOF's Avatar
    EOF
    Posts : 59
    Win7 Ultimate
    Thread Starter
       #7

    I assume the Rw1 must be connected to WAN. On Monday I will investigate forder.

    What is sure:
    The laptop where I saw the IP address was from the Rw1 but the laptop was connected to Rw2.
    Both of the routers Rw1 and Rw2 are in the same VLAN.
    When I accessed to the Rw1 and show the dhcp pool range I found it hold the IP given to the laptop which was connected to Rw2.
    I also checked the Rw2 setup and saw the dhcp pool is out of range of that IP address which was given to the laptop.

    But, why we focused to the WAN?
    Even if the routers are not connected to WAN they must share the IP address from there pool.
    Just the devices connected to them would not have access to the internet.
    But the dhcp servers would still be broadcasting the IP addresses and the internal LAN network would work.
    Shared printers, files and folders would be accessible I think.
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  8. MaloK's Avatar
    Posts : 493
    Windows 7
       #8

    To assess this you need to verify how the router are configured

    but I think that a part of this network has no internet because the router that has no wan still avertise it's own IP has gateway for the clients it gets.
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