netgraph issue

[sheeda]

sorry for the typo, the freebsd version is release 6.0

sheeda

On Mon, 13 Mar 2006 11:33:25 -0500, sheeda <list at talha.com> 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.
> 
> 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.
> 
> thanks to everyone for their help in advance.
> 
> regards,
> 
> sheeda
> 
> 
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