netgraph issue

[Julian Elischer]

sheeda wrote:

>hello everyone,
>
>i am new to netgraph and have been experimenting with few very basic configurations and facing some issues.
>
>i have got 2 machines, A & C, connected via third machine B with dual nics, with everything in same subnet.
>
>A <-----> B <-----> C
>
>i have used the bridge script in /usr/share/examples/netgraph and i am successfully able to ping between A and C.
>
>i did some experiments and getting weird results:
>
>1. i cleaned up the tee node and compiled a pipe node by removing the lefttoright and righttoleft hooks. once i load the ng_pipe.ko module and place it between the two ether nodes on lower hooks, i can't ping between A and C. i even switched the 2 interfaces to promisc mode and disabled the mac auto source thing through the msg command.
>
>(lnc0)-----(pipe)-----(lnc1)
>
>the ping strangely starts working if i start and stop the bridge script and then connect my pipe node, even after unloading the ng_bridge module.
>  
>
I tho9ught that the
the bridge node sent some contol messages to the interfaces it is 
connected to but
looking quickly at it, I can;t see that now. (?)..

why not start with a bridge node and simplfy that?
then you could see when it breaks :-)




>2. i suspected some issue with my pipe netgraph node, therefore connected the two ether nodes directly via lower hooks and had the same issue. the A & C starts communicating again once i start and stop the bridge script and then connect the lower hooks and set the promisious modes.
>
>(lnc0)----------------(lnc1)
>            lower
>
>all my 3 machines are freebsd release 3 in vmware. i have even tried setting up the static arps on A and C but it makes no difference.
>
>another interesting thing i found was that if i shutdown my pipe node, the two ether nodes connect directly on lower hooks and the ping continues to work.
>
>please let me know if this is all the default behaviour or if i am missing something.
>  
>

I think we're missing something..

>thanks to everyone for their help in advance.
>
>regards,
>
>sheeda
>
>
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