DHCP keeps sending out from old range

RouterOS General
1

Hi,

I have a silly thing. I reconfigured the LAN site of the roue from 192.168.88.x to 192.168.11.x as part of the initial configuration.
This included the DCP range.

But new client is still get an IP address from the old range and not the actual ranges assigned to the internal network.
So it seems I am missing a step here but for the life of I can’t find any reference to the old range anywhere in the configuration.

Any suggestions on how to find this on a hEX lite router?

2

When changing IP address subnet on ROS, there are roughly 4 places where changes have to be made:

  1. /ip/address
    This is the place where router’s own IP address is set.
    Optionally one has to change settings also under /ip/route … possibly also on other routers if present in LAN. In most SOHO environments this is not necessary, many router’s only have one LAN subnet.
  2. /ip/pool
    This part contains IP ranges which DHCP server will use to hand out dynamic addresses to clients. Range(s) have to fall into IP subnet configured in previous paragraph, otherwise problems can happen.
  3. /ip/dhcp-server/network
    This part adds additional settings … all the IP addresses have to make sense in context of new LAN IP subnet.
  4. /ip/dhcp-server/lease
    Not required, bot many times people assign “static” addresses to certain devices. Technically these addresses are not static (as “configured manually on end devices”), they are referred to as “static leases”, but serve similar goal. And one has to update IP addresses in this section to match the new IP subnet.

Possibly there are other places where one has to change bits and pieces (e.g. /ip/firewall and subtree), but default ROS setup doesn’t use LAN IP addresses other than the 4 places mentioned above. Perhaps the easiest way of finding old lingering IP addresses in config is to create text export (execute /export command in a terminal window), then copy-paste the output into your favourite text editor and use the “find” function to find references to old IP subnet. If anything is found, use your favourite UI to fix the reference to use new LAN IP subnet.

3

Thanks,

The pool was the missing part.