[ntp:questions] ntp peer association in VLAN query

Phil.Newlon at wendysarbys.com Phil.Newlon at wendysarbys.com
Mon Jan 19 16:08:59 UTC 2009


Danny -

It sounds like this is the same behavior that I asked about a few weeks
ago, I think.

I have a Windows machine with two IP addresses, acting as an NTP time
source for devices on one of the two networks.  Time synch requests come in
from the clients on network A, and the response from the Windows machine is
out the interface on network B.  RE: "query-on"


Danny wrote:

What you require is the query-on option. I haven't had time to roll it
into a release yet. You need outbound queries to go on the routeable
address, correct?


Phil




                                                                           
             Danny Mayer                                                   
             <mayer at ntp.isc.or                                             
             g>                                                         To 
             Sent by:                  kiran shirol                        
             questions-bounces         <kiran.shirol at gmail.com>            
             +phil.newlon=wend                                          cc 
             ysarbys.com at lists         questions at lists.ntp.org             
             .ntp.org                                              Subject 
                                       Re: [ntp:questions] ntp peer        
                                       association in VLAN query           
             01/19/2009 11:04                                              
             AM                                                            
                                                                           
                                                                           
             Please respond to                                             
             mayer at ntp.isc.org                                             
                                                                           
                                                                           




kiran shirol wrote:
> My switch has configured for peering with the following switches
>
> ntp peer 101.1.1.2
> ntp peer 101.2.2.2
> ntp peer 102.1.1.2
>
> Vlan has the following configuration:
> ip address 10.1.1.1/24
> ip address 20.1.1.1/24 secondary
>
> Peer sends the NTP message 20.1.1.2(Out-Interface) -> 20.1.1.1(VLANs
secondary IP)
> The response comes as 10.1.1.1(VLANs Primary IP) -> 20.1.1.2
>

That means that the VLAN is using the wrong address to reply to the
message. NTP will see that it does not match the going address and will
discard the message. That's correct behavior. You need to figure out why
the packet is coming back with the incorrect address. i suspect the VLAN
but I cannot be sure.

Danny


> Traces:
> 2008-12-20 00:01:40.522776     20.1.1.2 -> 20.1.1.1     NTP NTP symmetric
active
> 2008-12-20 00:01:42.548166     10.1.1.1 -> 20.1.1.2     NTP NTP symmetric
passive
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