Everyday between 4 and 5pm we are having phone issues on our network. They can hear us but we hear static, underwater or no dial tone at all. We have the VOIP setup on a seperate VLAN and the normal data side seems to be unaffected. They use the same layer 3 switch and DHCP server is setup with different scopes. Using the Avaya interface we can see every call has between 50% and 90% packet loss. Eventually everything starts to work again typically after 20 min or if we force reboot all the phones by restarting the Avaya software. I setup Wireshark on the network to see if I could find any bad traffic. One consistency that I found is that between 4-5pm there is 500 thousand+ bytes of ipv6 traffic. This has happen 5 out of the last 7 days and everytime this is the main difference that I see. We dont have any devices using IPv6 currently. Between 3-4pm there might be 20k IPv6 bytes. Id like to find out if I can get the IPv6 address listed and map it to IPv4. It looks like most of the traffic is multicast listener report. Have any of you heard of this causing issues like this? Alot of the bytes are listed under FF02::2 which I Googled and it says its a router. Is there anyway to narrow that down?
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