Hi Paul,
as for the "mcast_if" stuff, there seems to be some handling in
"lib/apr_net.c" routine "mcast_join". But glancing over the code it
"feels" fishy. Maybe Matt can have a look.
Cheers
Martin
--- Paul Millar <[EMAIL PROTECTED]> wrote:
> Hi,
>
> At the risk of asking some stupid, I've a couple of questions.
>
> First question: is it possible to specify on which interface the
> multicast
> packets should be sent? There's an option "mcast_if" that proports
> to do
> this. It works on the bundled version in Debian testing
> (ganglia-monitor-2.5.7-3), but doesn't seem to work with 3.0.2. For
> 3.0.x,
> I'm using a config file with:
> udp_send_channel {
> mcast_join = 239.2.11.71
> port = 8686
> mcast_if = eth1
> }
>
> Switching on debug show ganglia picks up the mcast_if option, but
> "tcpdump -i
> eth0 port 8686" shows the data is being delivered on eth0.
>
> What surprised me was that there was apparently no code to support
> this in
> 3.0.2, i.e. nothing seems to do a:
> setsockopt( s, IPPROTO_IP, IP_MULTICAST_IF, &sin, sizeof( sin));
> kind-of-a-thing.
>
> Am I missing something obvious here?
>
> Second question: there seem to have been some kind of corruption bug
> with
> gmond in Ganglia v2.5.7. Some strings of gmetric information end up
> getting
> corrupt. I've checked what I'm sending over the wire (I'm using
> MonAMI
> rather than gmetric) so I'm pretty sure I'm not generating the
> corrupt data.
> Using the same MonAMI code, but with gmond from 3.0.2, the corruption
> goes
> away. I'm guessing this is a bug that was fixed between 2.5.7 and
> 3.0.2, but
> it's also possibly something that the Debian packaging has introduced
> (or
> something I'm doing wrong).
>
> Does anyone know if there's a known issue with v2.5.7 and if so,
> which version
> of Ganglia fixed the bug (so I can document it)?
>
> On Thursday 23 Feb 2006 21:53, Martin Knoblauch wrote:
> >
>
http://www.knobisoft.de/ganglia/ganglia-3.0.3.200602231926-apr0.9.7.tar.gz
>
> Looks OK for me, although it has the same problem with sending
> multicast data
> to the specified interface.
>
> Cheers,
>
> Paul.
>
------------------------------------------------------
Martin Knoblauch
email: k n o b i AT knobisoft DOT de
www: http://www.knobisoft.de
