Date: Fri, 23 Aug 2002 12:14:39 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Radko Keves <rado@studnet.sk> Cc: questions@FreeBSD.ORG Subject: Re: question about ntpd and multicast Message-ID: <20020823111439.GA95674@happy-idiot-talk.infracaninophi> In-Reply-To: <20020823103810.GA95705@studnet.sk> References: <20020823103810.GA95705@studnet.sk>
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On Fri, Aug 23, 2002 at 12:38:10PM +0200, Radko Keves wrote:
> i try to set up multicast in ntpd and have found this:
>
> -m Synchronize using NTP multicast messages on the IP multicast
> group address 224.0.1.1 (requires multicast kernel).
> ^^^^^^^^^^^^^^^^^^^^^^^^^
>
> i use current is implicit set up multicast in kernel or i need some option ?
multicast isn't the problem: FreeBSD supports it already. What I
guess you may be running into is an authentication problem. You can't
run broadcast or multicast ntp without using key based auth.
In /etc/ntp.conf on the server you need to add statements like these:
broadcast 224.0.1.1 ttl 32 key 13
keys /etc/ntp.keys
enable auth
and on the clients you need:
multicastclient
keys /etc/ntp.keys
trustedkey 13
enable auth
and the /etc/ntp.keys file on all machines should contain (inter
alia) something like:
13 M 59AWWYds
where the 3rd field is an arbitrary string which is the shared secret
between the clients and server. See ntp.conf(5), ntp.keys(5) for the
gory details.
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
Savill Way
Marlow
Tel: +44 1628 476614 Bucks., SL7 1TH UK
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