Item added, Item removed

RouterOS General
1

Hello everybody,

I’ve had today a really strange behaviour.

Two of my Mikrotiks lost their IPs on WAN because of NAK from ISP, but both are reachable and got the usual IP.
The mikrotiks aren’t connected to the same provider.

Both of them had strange entries in the log after the NAK:
13:26:48 dhcp,critical,error dhcp-client on ether1-gateway lost IP address ... - received NAK from dhcp server ...
13:26:48 system,info item removed
13:26:48 system,info item removed
13:26:49 system,info item added
13:26:49 system,info item added

I’ve found hardly any information regarding “item removed” and “item added” and also nobody was connected through ssh or winbox.

Does anybody know what that could be?

2

Does really nobody know what those strange log entries are? :frowning:

3

Since the time matches up with the DHCP server, chances are it’s removing the dynamic IP and once a new one is received it’s adding a dynamic IP. If you are getting duplicate messages in the logs, that probably means your logging setup is set to log either system or info messages separately or do another logging “location”.

4

Thank you!

I also think that the 4 log entries have something to do with adding and removing the IPs, but it would be really great if the log could show more information.

I’ve checked the logging.
info → memory
error → memory
warning → memory
system, info, account → email

However there’s no logging for system.

5

I am seeing the same thing on one router that is behind an ISP router and gets DHCP from that.
Sometimes the address lost because of NAK and regularly the item removed, item added thing.
Funny is that it is not happening all the time. When it has lost the address a powercycle fixes it.