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If the IPv6 link-local address is manually deleted on an interface, is there a way to obtain the link-local address back without bringing the interface down? The requirement stems from the need to hold onto (IPv4) existing connections on the interface, but also obtain the link-local address on it.
GNU/Linux systems typically use “ip” (from the “iproute” package) to configure addresses. A link-local address would be added using something like
Did you try that?
If your problem is that you don’t know what exact address you should use as the link-local address: These addresses are typically derived from the hardware (MAC) address of the interface.
Take the MAC address of the interface (the “link/ether” field in the result of “ip link show dev …”), and convert it to Modified EUI-64 according to this procedure.
Then add “fe80::” (standard link-local prefix) to the left and “/64” (as the subnet prefix length) to the right.