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Hello fellows,
I'm trying to implement a mechanism where I could have control over packets coming in from an interface or going out of the IP stack, so that I could stop the normal flow (dictated by IP routing) and then choose a different network interface for the traffic to flow. So, for example, if IP routing determines that a packet should go out via interface eth0, I'd like to stop that and redirect it to interface wlan0, for example. In the same way, when the packet is coming from the link-layer, before reaching IP, I'd like to stop it and send it to a different interface, or just letting it up if this is the destination.
I read some documentation (which unfortunaly is pretty scarce) on netfilter doing this, but I'm not sure if it is possible, since netfilter seems to operate for layer 3 and above. I'm trying to work on something like layer 2.5.
Any ideas on how this could be accomplished? I could give more examples if the explanation is not clear enough.
best regards,
- Breno
ebtables?
i still don't understand what you want to do and why you can't just change the routing table, but have you checked http://ebtables.sourceforge.net/ ?
Ethernet Bridge
Hello, thanks for your answer.
I'm aware of Linux Ethernet Bridgig, and that it would be a very good candidate for what I'm trying to do. But by reading previous posts on their list, they mention that to bridge an 802.11 connection and a Bluetooth connection, you must set 802.11 cards in managed mode. Well, since I'm trying to implement a transparent bridge of 802.11 ad hoc and Bluetooth networks, may be it would not fit for the task. Besides, I'd need some traffic control functionality, such as sending a broadcast message to everybody (which means everyone in both networks). There's a simple topology written in the post below.
I'll try ebtables, and see if I get any meaningful results.
thanks again for you help.
cheers,
- Breno
policy routing
You most likely want to use policy routing. You can have multiple routing tables with "ip rule" command. The routing table to be used can be decided based on source ip or fwmark (which can be set using iptables rules).
Hi.. Netfilter hooks will
Hi..
Netfilter hooks will serve your purpose..
You should go with it.. I have already did it..
netfilter hooks
Hello, thanks to all of your answers.
I intend to try that with netfilter, but documenation is so scarce. Do you have any resources about this issue that you could share?
Basically what I wish to do is implement the following scenario:
802.11 ad hoc network Bluetooth BNEP network Node A ---- Node B ---- (( Node C ))--- Node D --- Node E (802.11/BT gw)I'd like to make Node A (802.11 only) talk to Node E, which is Bluetooth only. Node C would be the 802.11/Bluetooth Gateway. I'm sure this could be done by IP, but since in the future we may try other protocols abover layer 2, being network-layer neutral and operating at layer 2.5 is a must.
best regards,
- Breno