[ntp:questions] configurations issue for broadcastclient in Linux machine

Danny Mayer mayer at ntp.isc.org
Wed Jun 13 03:04:50 UTC 2007


mike.keighley at adare.com wrote:
> On Tuesday, May 15, 2007 at 8:28 AM
> Danny Mayer [mailto:mayer at ntp.isc.org] wrote:
> 
> <snip>
>> Do you know why it's insisting on sending the packet out to the
>> 255.255.255.255 IP Address?
> <snip>
>> The problem is that cisco seems to use the all broadcast address.
> 
> I believe Cisco IOS does indeed broadcast to all-1s by default, but I make 
> it broadcast to the subnet-broadcast-address like this:
> 
> interface FastEthernet0/1
>     ip address 172.17.1.1 255.255.255.0
>     ip broadcast address 172.17.1.255
>     ntp broadcast key 1001 destination 172.17.1.255
> 
> ntp authenticate
> ntp authentication-key 1001 md5 <password-for-bcasts>
> ntp authentication-key 1002 md5 <password-for-peers>
> ntp trusted-key 1001
> ntp trusted-key 1002
> ntp broadcastdelay 3000
> ntp server 158.43. etc. etc.
> ntp peer 172.17.6.200 key 1002
> ntp peer 172.17.7.200 key 1002 etc. etc.
> 
> Apologies for being so late responding to this. 
> I was on the verge of responding, when I discovered my authentication was 
> "broken". 
> Hope it is still of interest.
> 
> Mike.

Yes, it's still of interest. I'm in the process of fixing a number of
broadcast issues and those fixes should be available in the next day or two.

Danny



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