Global scope address, unique everywhere, so no interface index is required
// no index required
-c "links=tcpip(Host=fd77:55d:59d9:56a:202:55ff:fe76:df19)"
// all communication is done through interface 2
-c "links=tcpip(Host=fd77:55d:59d9:56a:202:55ff:fe76:df19%2)"
// all communication is done through eth0
-c "links=tcpip(Host=fd77:55d:59d9:56a:202:55ff:fe76:df19%eth0)"
Link scope address, addresses are unique on each interface
// possibly ambiguous (this host may exist through both eth0 and eth1)
-c "links=tcpip(Host=fe80::202:55ff:fe76:df19)"
// not ambiguous because it must use interface 2
-c "links=tcpip(Host=fe80::202:55ff:fe76:df19%2)"
// not ambiguous because it must use eth0
-c "links=tcpip(Host=fe80::202:55ff:fe76:df19%eth0)"