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Firewall Attack Help !!

Help, my Firewall is detecting that IP Address 193.108.87.93:6184 has a target Destination of : 192.168.1.255:137 UDP.

There are no custom filters setup on my Firewall to point traffic to that address and I dont have PC with an address of 192.168.1.255.  When I ping 192.168.1.255 on my LAN I do get results returned.  But I definatley dont have a printer, device or anything else.

Whats going on !!!
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Chris Dent
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*edit* Should read: Broadcasts from the Subnet 192.168.1.0/24 are all sent to the 192.168.1.255 address.

For an external device trying to access that port it could be any of someone Port Scanning or perhaps a Virus (on the remote computer).
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So Chris should I clode port 137 anyway ?

In my opinion no one will need to get to Port 137 Externally, equally Port 137 will not need to go outside of your network. So it should be closed. on the Firewall.
Thanks Chris