Netgraph plumbing question

[Julian Elischer]

Rajkumar S wrote:

> Hi,
>
> In the ng_split node is it possible to merge 2 incoming streams into
> mixed, while all packets received at mixed goes via out? If merge node
> does not support that, is there any other way to get the same result?


this is used to separate the streams going in different directions.
 for example:

(fixed fomt needed)
             
              _____________
<-----A-------[  ng_split ]<-----A------
------B------>[           ]
              ~~~~~~~~~~~~~
                    |
                    B
                    |
                    v


you can also use ng_tee for this sort of thing.
e.g.

             
              _____________
<-----A&C-----[  ng_tee   ]<-----A------
------B------>[           ]------B------>
              ~~~~~~~~~~~~~
               |^     |^
               v|     B|
               ##     |C
                      v|

in addition arbtrarily complicated switching can be done with the ng_bpf 
node
though it takes more to set it up.

there may be other nods that can do what you want too..
check out all the nodes give by:
man -k ng_

or it is easy to write your own, starting with
/usr/src/sys/netgraph/ng_sample.c

>
> regards,
>
> raj
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