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frequent broadcast problem, maybe

Discussion in 'Networking' started by lunarlander, Sep 22, 2018.

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  1. lunarlander

    lunarlander Thread Starter

    Joined:
    Sep 21, 2007
    Messages:
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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.
     
    Last edited: Sep 22, 2018
  2. lunarlander

    lunarlander Thread Starter

    Joined:
    Sep 21, 2007
    Messages:
    11,821
    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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