A fix is included. I originally wrote this for Mandrake 8.2 but I see that
the same version of ntp is still used in cooker. My patched rpm seems to
be working happily.
I originally mailed this to message [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: ntp-4.1.1 will not accept broadcast packets
When I upgraded one my Linux computers from Mandrake 8.0 (with a patched
ntp-4.0.99k) to Mandrake 8.2 (ntp-4.1.1) the ntp daemon stopped accepting
broadcast ticks from our department servers.
The following is the ntp.conf used with comments removed:
--- BEGIN of /etc/ntp.conf ---
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 13
driftfile /etc/ntp/drift
broadcastclient
authenticate no
--- END of /etc/ntp.conf ---
The following is the patch that it took to make it work:
--- ntp-4.1.1/ntpd/ntp_proto.c.ORIG Wed May 29 09:39:46 2002
+++ ntp-4.1.1/ntpd/ntp_proto.c Wed May 29 11:07:39 2002
@@ -348,11 +348,10 @@
}
/*
- * Discard broadcast packets received on the wildcard interface
- * or if not enabled as broadcast client.
+ * Discard broadcast packets if not enabled as broadcast client.
*/
if (PKT_MODE(pkt->li_vn_mode) == MODE_BROADCAST &&
- (rbufp->dstadr == any_interface || !sys_bclient))
+ !sys_bclient)
return;
/*
For all of our arriving broadcast packets the equality
"rbufp->dstadr == any_interface" was true. I do not see the necessity for this
test as there is no way in ntp-4.1.1 to set which interface listens to
broadcast packets.
Bill Sebok Computer Software Manager, Univ. of Maryland, Astronomy
Internet: [EMAIL PROTECTED] URL: http://furo.astro.umd.edu/
I received this reply (condensed) from David L. Mills, the original author
of ntp.
> The extra test was put in as defense when multicast breaks and the I/O
> code is unable to determine which outbound interface will be used. This
> works in all architectures known to me, but breaks in Linux. I have
> since removed the paranoid test so Linux does work with broadcast, but
> of course flames out with multicast. I don't know which incremental
> release version has the removed test, which was made some time ago.
> Dave
The following was my reply to his note:
It is still present in 4.1.1a, the latest "stable" version listed on the ntp
web site. Mandrake 8.2 picked up ntp-4.1.1 which, unfortunately, broke things.
Bill Sebok Computer Software Manager, Univ. of Maryland, Astronomy
Internet: [EMAIL PROTECTED] URL: http://furo.astro.umd.edu/
