A lot of traffic to/from ports 137-139

Hello.

I have several rb433’s on different towers and have noticed that theres a lot of traffic to and from ports 137-139. Also, if a client does a network search it shows the other client’s pc. If these clients do not have a firewall active or simply is sharing a folder other clients on the network can access it.

I would like to prevent that from happening. Another thing I noticed is that viruses are propagating within our lan as well.

I have disabled the default forward option for wireless but haven’t noticed any differences.

How can I block or prevent these issues and not affecting the “normal” traffic?

Thanks in advanced for your help.

It’s a liitle bit strange that clients can connect to each other with ‘default-forwarding=no’.
What about your forwarding settings in Access list?
http://wiki.mikrotik.com/wiki/Manual:Interface/Wireless#Access_lists

HTH,