scenario
you have a switch facing a firewall port and you’re seeing some spurious DHCPv6 hits
against the native VLAN despite having no switchport native vlan being set on the
trunk interface facing the firewall.
a quick look at the link local addresses points at the switches themselves in
the network. then you remember that you have cisco switches and that you need to
check the most holy VLAN 1. mercifully, the following fixes this broke ass
behavior.
interface vlan 1
no ipv6 dhcp client stateless
meta
- location: Minneapolis, MN
- weather: 🌦(Light rain, mist) +72°F