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Old 6th January 2009
PeterSteele PeterSteele is offline
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Default Broadcast does not under FreeBSD

We need to write a Python app that uses limited broadcast to send messages in our closed network. However, we've discovered that although our code works fine under Linux it does not work under FreeBSD. This problem appears to be described in this article:

http://unix.derkeiler.com/Mailing-Li.../msg00067.html

Is this problem still not resolved in FreeBSD 7.0? We essential that we find a way to send/receive broadcasts under FreeBSD, preferably in Python. Surely there must be a way to do this? Any suggestions would be greatly appreciated.
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Old 6th January 2009
PeterSteele PeterSteele is offline
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Default Broadcast does not work under FreeBSD

I meant "does not *work*" of course...
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Old 6th January 2009
PeterSteele PeterSteele is offline
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I came across another lengthy discussion on this subject:

http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/99558

It appears some work has been done to correct this problem but if I understand the discussion correctly it still is not resolved, at least at the timeframe of this thread.

In our case, we have systems with no IP identity of any kind--no IP address and no gateway, and they are connected by switches. There is no router in the network. They receive IP addresses through this special service that we've written that runs on one of the systems. All communication is done through limited broadcast. This works fine one our Linux and Windows boxes but not FreeBSD.

It may very well be user error in our FreeBSD code. Has anyone managed to get limited broadcast to work under FreeBSD?

Last edited by PeterSteele; 6th January 2009 at 02:37 PM.
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Old 6th January 2009
J65nko J65nko is offline
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You probably will get more response by asking on the freebsd-stable mailinglist or on freebsd-hackers. Especially if it used to work on FreeBSD 4.x and 5.xx

I wonder if there could be a sysctl variable you need to turn on. Unfortunately don't have a FreeBSD box available at this time.
OpenBSD has a sysctl to enable directed broadcasts, which is not what you want
Code:
$ sysctl -a | grep broad
net.inet.ip.directed-broadcast=0
Only after setting this to 1, a directed broadcast would work under OpenBSD.
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Old 6th January 2009
PeterSteele PeterSteele is offline
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Yeah, the hackers list is probably the best option. And I just checked the sysctl list and there is no such variable to enable broadcasts. Now that would have been a nice solution!

Thanks.
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Old 21st January 2009
tehuelche tehuelche is offline
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Using raw sockets maybe?
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