LLMNR multicast slow down network service
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Hi.
I manage a network with ~300 hosts with PFSense, latelly the internet connection is working intermitent, i tested and the channel is stable.
So we checked and see many LLMNR multicast petitions from many machines.We decided to disable the LLMNR in the windows machines, but there's a lot of hosts with windows but is a large process, with pfSense is possible to deny LLMNR in the network?
Thanks
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No, because the multicast traffic does not go through the router.
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"LLMNR in the windows machines"
hehehehe - you know windows machines pump out way more noise then just the llmnr crap… The amount of noise coming off a windows machine is quite spectacular...
So if your going to spend time cutting down its noise that is just the first place to start...
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Assuming that you have AD in place (you most certainly should with ~300 devices), you should disable the service via GPO.
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disable llmnr in gpo yup..
Computer Configuration -> Administrative Templates -> Network -> DNS Client
“Turn Off Multicast Name Resolution” and set it to “Enabled”