ttl is the time-to-live (15 for site, 63 for region and 127 for world).
WARNING: it is *strongly* recommended to avoid using groups beginning with
- 224 or 239. Such groups are considered 'admin' groups, and may
- behave in a surprising way ..."
+ 224 or 239. Such groups are considered 'admin' groups, and may
+ behave in a surprising way ..."
(let (dest port ttl)
;; We check only the general form of the multicast address.
;; The rest will be handled by the internal function.