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Broadcasts and Multicasts  Broadcasts and Multicasts
Domain Time II Server
Version 5.2

These are the broadcast and multicast addresses used by Domain Time Server.


CAUTION: The default settings on this page are correct for most situations. Only make changes if you are sure you need them and you fully understand the effects of the change.

Broadcasts and Multicasts are used for a variety of purposes by the various Domain Time components. For example:

  • Server uses them to send cascades and advisories
  • Server uses them as the listen addresses for IPv4 and IPv6 multicast requests
  • Server uses them to send broadcast/multicast time (using the DT2, NTP and PTP protocols)
  • Tools that don't have their own settings (for example, dtcheck.exe) use them for discovery and testing
  • Clients can use them to discover DT2, NTP, and PTP time sources
  • Clients use them as the listen addresses for IPv4 and IPv6 multicast requests

 

The settings on this page control whether Domain Time will enable multicasts and broadcasts and what addresses to use for these functions. Note, Domain Time joins multicast groups by default even if these settings are disabled. Also, multicasts will always be used if you enable PTP. Multicast group join settings are set on the Network property page.

 IPv4 Broadcasts 

 Enabled         Broadcast address:  

This section configures the Domain Time IPv4 Broadcast address.

    By default, Domain Time Server will use broadcasts only on subnets local to this machine. If you want to reach machines on remote subnets, you should enable multicast (see below).


    IMPORTANT: Disabling all broadcasts on this page may prevent your time hierarchy from operating correctly. If you are looking to disable a particular type of broadcast (such as NTP broadcasts) you are better off disabling that specific broadcast type on its property page instead. See the Serve the Time and Domain Role property pages for details.

 

 IPv4 Multicasts 

 Enabled
TTL: 
DT2 multicast address: 
NTP multicast address: 

This section configures the Domain Time IPv4 Multicast address.

    The TTL (Time-to-live) entry sets how many router hops a multicast should make when propagating through your network. Choose a value that allows your multicasts to reach all of your subnets. This is usually the only setting you should change in this section.

    Changing the multicast address listed here is usually an error.


    IMPORTANT: Disabling all IPv4 Multicasts on this page may prevent your time hierarchy from operating correctly. If you are looking to disable a particular type of multicasts (such as NTP multicasts) you are better off disabling that specific multicast type on its property page instead. See the Serve the Time and Domain Role property pages for details.

 

 IPv6 Multicasts 

 Enabled
Hop Count: 
DT2 multicast address: 
NTP multicast address: 

This section configures the Domain Time IPv6 Multicast address.

    The Hop Count entry sets how many router hops a multicast should make when propagating through your network. Choose a value that allows your multicasts to reach all of your subnets. This is usually the only setting you should change in this section.

    Changing the multicast address listed here is usually an error.


    IMPORTANT: Disabling all IPv6 Multicasts on this page may prevent your time hierarchy from operating correctly. If you are looking to disable a particular type of multicast (such as NTP multicasts) you are better off disabling that specific multicast type on its property page instead. See the Serve the Time and Domain Role property pages for details.

 

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