frequent broadcast problem, maybe

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lunarlander

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Hi,

I have a 2 computer network both running Win 10. One is for surfing, and the other is a central log server that collects event logs.

The log server computer is meant to collect logs only and never connects to the internet. So I have set the following:
. Windows firewall set to block all incoming and outbound connections.
. Windows firewall only allow one incoming port for the surfing machine to send event logs over
. Network adapter properties > IPv4 properties > has no gateway ip set up
. Network adapter properties > IPv4 properties > has a static ip
. Network adapter properties > IPv4 properties > has no DNS ip's set up

The gateway router is a PfSense firewall
. Firewall rules > LAN > blocks all inbound and outbound TCP/UDP/ICMP to and from log server
. DHCP server > off

The problem is that that something is generating a broadcast every 5 seconds. The logs are sent over UDP. And since it is a best effort protocol, I think some event log entries are dropped because of the broadcast.

If it is a broadcast, and not someone scanning my network computers, then I need to find a way to stop it. How can I verify that it is a broadcast? I can attach a Linux computer and use TCP dump, but I am not very good at reading TCP dumps.
 
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lunarlander

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Solved the problem, but not in an ideal way.

Ran WinDump and found the broadcasts are TCPv6 router advertisements. Disabled TCPv6 on the router and the broadcast is gone.

I would rather not disable TCPv6, but just the router advertisements.
 
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