-is set, it should be an IPv4 and/or an IPv6 address, separated by space:
-these are the addresses to configure as the remote end point of the
-point-to-point link. (Further remote addresses can be configured as
-host routes: see below.) IPv4 addresses are expected to be in
-dotted-quad form; IPv6 addresses should be in RFC4291 hex-and-colons
-form.
+is set, it should be a list IPv4 and/or an IPv6 addresses, with optional
+prefix lengths, separated by space: these are the addresses to
+configure as the remote end point of the point-to-point link. (Further
+remote addresses can be configured as host routes: see below.) IPv4
+addresses are expected to be in dotted-quad form; IPv6 addresses should
+be in RFC4291 hex-and-colons form.