[Spread-users] Spread broadcast spam?
John Lane Schultz
jschultz at spreadconcepts.com
Mon Jun 18 15:21:04 EDT 2007
Jan Mulders wrote:
> Why is Spread spamming the entire subnet?
Because you have configured Spread to spam the entire subnet.
The address immediately following 'Spread_Segment' is the address used to
disseminate data packets to all the daemons listed within that same segment. If
you do not have multicast or broadcast enabled, then all of your daemons should
be listed out in singleton segments.
> Why doesn't it list 'b retrans' as a number more than 0 in spmonitor?
b-retrans indicates that the daemon had to do a system wide retransmission to
recover lost packets for other daemons. In your system it doesn't look like it
ever needed to do that to recover packets.
> Why doesn't Spread notice that Multicast and Broadcast don't work, and
> fall back to Unicast on a per-session rather than (presumably)
> per-packet basis?
Looking at your spmonitor output fdc33 is overcoming being configured with a
broken broadcast address as it is unicast retransmitting pretty much every
packet (probably to fdc2 to whom it is configured to communicate using broadcast).
Spread isn't currently designed to overcome byzantine behavior from its
> Is there an option to change this behaviour?
Yes, configure Spread the way you want it. Since it seems you don't want
multicast or broadcast between any of the daemons I would recommend trying
something like this:
That should cause all of your daemons to use point-to-point UDP traffic to
disseminate data traffic to the other daemons.
> fdc33 is sending the logs, and fdc2 is recieving the logs.
Please be aware that even though only one machine is sending and another
receiving that all data traffic is disseminated to all daemons whether they are
involved in the particular group level communication in question or not.
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