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Old 07-12-2007, 02:42 AM   #1
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Registered: May 2007
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loop packets out tap0 like an access point

I have a bridge (br0) made up of eth0 (local LAN) and tap0 (software that talks to several PLC's).

The problem that I have is that sometimes the PLC's(VERY dumb device) need to send packets to other PLC's... This is done by sending a packet to a piece of software which gives it to tap0.

I am searching for some way to cause the bridge to notice that the packet arriving through tap0 with IP address is destined for an IP address ( and that it is also located on tap0 (destination interface is the same as the arriving) and then go ahead and transmit that packet back to (and through) tap0.

I believe that this is similar to what wireless access points do between two laptops however there is NO wireless interface which means NO HOSTAP... ALSO, as I have seen in other access point articles I believe that I can NOT do a NAT because these PLC's need to be accessible from both sides of br0 and a NAT would cut direct access off from the eth0 side.

It seams to me that there is probably some way to accomplish this with iptables, bit I don't see how.

I know there is probably a standard way to do this so please point out the obvious I can take it

Thanks in advance,



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