Hi, we use CCR1009 as our core router and CRS125 as switch.
We had 1 private IP series defined in IP Addresses and FIREWALL > Addresses List.
It was 173.182.200.1/24
We just have 100 customers now.
Last week, we started getting calls that, login panel is coming but there is no internet.
I checked HOTSPOT > ACTIVE and I saw there is a new IP series getting assigned to the customers,
173.182.199.xx
I dont know, from where it came.
I immediately went into winbox and added it to the IP Addresses and Firewall Addresses List.
Then their internet was back.
But it still stays mystery how and from where 173.182.199.xx got assigned, while it doesnt exist in the configuration at all.
Check for different DHCP server connected to the same L2-level LAN.
This DHCP server is “faster” serving addresses so it means that it is “closer” to your clients than your proper server and takes over the expected one.
Check in Winbox IP/DHCP Server/Alerts.
I had 3 ether blank and not being used.
I configured one ether for PPPoE last week and we converted few 8 -10 important customers to PPPoE.
This problem has raised after PPPoE getting active.
Can this be anything related to that thing ?
May the IP is getting over because every 1 min all the PPPoE users get disconnected and connected automatically, when the accounts are having some activity.
Soamz: see “alerts” part of http://wiki.mikrotik.com/wiki/Manual:IP/DHCP_Server
Add in the window you have pasted all interfaces you want to observe and watch log infos.
You can specify exact addresses of all known dhcp servers for each interface.
RogueDHCP.PNG
Maybe PPoE client has own DHCP server and is “poisoning” your LAN when connects ?
It seems, when the PPPoE users inactive, then their device goes offline and online in every 1 minute or less.
May be that is using up all the IP range and then it switches to next series.
This is dangerous, because, now we have 8 PPPoE customers and it has killed the whole network due to this.
We are planning to move all 157 customers to PPPoE now in a week.
So that PPPoE users, if found idle for 1 hour, then they should be disconnected completely and when then come back and start something, then the connection should happen.