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Probably what's happening is that you're seeing IPv6 broadcast traffic on your subnet, as per what you posted from a tcpdump output here: 12:19:41.622297 IP6 (hlim 1, next-header UDP (17) payload length: 112) fe80::a4a0:460b:c99a:c992.dhcpv6-client > ff02::1:2.dhcpv6-server: [udp sum ok] dhcp6 solicit (xid=455863 (elapsed-time 700) (client-ID hwaddr/time ...


The 2960-S is a layer 2 switch. If you need routing between VLANs, you need a router.

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