[c-nsp] NTP message sent to, from interface 'NULL' (

Phil Bedard philxor at gmail.com
Tue Jul 2 08:55:29 EDT 2013

NTP "broadcast" sends the messages using multicast, to  See


On 7/2/13 6:09 AM, "Victor Sudakov" <vas at mpeks.tomsk.su> wrote:

>Why is a CISCO3945 router sending multicast NTP packets with ttl=31 (!)
>while I have never configured it to do so? "debug ntp packets" reveals:
>NTP message sent to, from interface 'NULL' (
>NTP: ntpio_send_ipv4 called with bcast address and NULL interface
>In fact, it is configured to send NTP broadcast messages on some
>Ethernet interfaces, but not multicast. What could be wrong?
>interface GigabitEthernet0/0
> description Orlovka
> ip address
> ip pim sparse-dense-mode
> duplex auto
> speed auto
> ntp broadcast destination
> ntp broadcast
>Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
>sip:sudakov at sibptus.tomsk.ru
>cisco-nsp mailing list  cisco-nsp at puck.nether.net
>archive at http://puck.nether.net/pipermail/cisco-nsp/

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