104 SyncServer 600 Series User’s Guide 098-00720-000 Revision D1 – February, 2018
Chapter 4
Navigation Windows
For broadcast, the IP address is the local subnet broadcast address.
For multicast, the IP address is an IPv4 or IPv6 multicast address. This can
beeither the IANA designated NTP multicast address (224.0.1.1 IPv4 or
FF0X:0:0:0:0:0:0:101 IPv6) or any unassigned multicast address (typically in the
range 224.0.1.0 to 238.255.255.255 for IPv4 or FF0X:x:x:x:x:x:x:x for IPv6).
You can configure multiple multicast addresses but only one broadcast address
on a SyncServer S6x0.
The broadcast and multicast NTP requires authentication on both server and
client(s).
SyncServer S6x0 requires user to configure MD5 symmetric authentication and
apply a MD5 key to broadcast and multicast.
SyncServer S6x0 does NOT support unauthenticated broadcast and multicast,
since the latest NTP version adds authentication to broadcast packets for
security reasons. However, SNTP clients are not compatible with authenticated
packets.
SyncServer S6x0 does NOT support broadcast and multicast with Authkey.
The TTL used for multicast is in the range: [1, 7].