[ntp:questions] NTP to multiple networks via one interface.

sc0tt.v3rn0n at gmail.com sc0tt.v3rn0n at gmail.com
Sun Dec 15 23:37:55 UTC 2013


On Friday, 13 December 2013 15:08:43 UTC+11, sc0tt.... at gmail.com  wrote:
> Hi,
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> 
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> We have a xenserver host.  We manage it via an interface on x.x.75.x which is the only network that is actually plumbed in on the host.  It has other interfaces but they are virtualised by xen and don't have IP's.
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> 
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> We have several VM's on this host on the same x.x.75.x network so we have set the xenserver to broadcast ntp (it syncs from network switches) and the VM's to be broadcast clients .  NTP is working ok in this scenario.
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> 
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> However we've added a new network to xenserver on x.x.69.x but VM's on this network don't receive the NTP broadcast packets as they don't have an interface on the x.x.75 network.
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> Is there any way to get the NTP packets to all VM's without dual homing either the xenserver or the VM's.
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> Thanks in advance,
> 
> 
> 
> Scott

Thank you all for your replies.  I just attempted to add a new broadcast address to the ntp.conf of Dom0 but that highlighted a loop somewhere in our test network that caused a broadcast storm.

I need to fix that before i move any further with ntp.

Thanks again,

Scott



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