[ntp:hackers] Re: IPv4 multicasting -m command line option

David L. Mills mills at udel.edu
Tue Dec 14 21:33:27 PST 2004


I have no idea what what the -m option is for. I did not install that 
option and do not know what the expections are. As you can see, the ntpd 
configurations are easily exploited. I would like that to stop.



Danny Mayer wrote:

> Dave,
>         I got this from a user and sure enough on the ntpd.html page
> the -m option is mentioned. In the code it really sets this up. I think
> that this is a very bad idea at the command line level. I think it
> should only go into the config file or were you thinking of some
> situation where you couldn't have a config file. In that case the
> address should be an argument to the option and could allow for
> both IPv4 AND IPv6 addresses and you could then have multiples.
> Danny
>> 0) I just saw this in the man page - do I need this flag, or a different
>> kernel?  I'm not using the flag - relying on the ntp.conf file.
>> -m      Synchronize using NTP multicast messages on  the  IP  multicast
>>                group address (requires multicast kernel).

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