Messages in this thread | | | Date | Thu, 06 Dec 2001 11:43:21 +0100 | From | Romain Giry <> | Subject | Re: |
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Hi,
> > I'm doing a ethernet device > > that doesn't add any header to the packet but change the output device, > > then i should say the network device that the packet is like if it has been > > sent by the ip protocol. > >I didn't understand what did you mean by "ethernet device doesn't add any >header but change the output device"? May be after you explain a bit more I >can suggest something more.
For my thesis, I should do a module for linux that allows the user to switch the physical device at run-time. In a first time this should be done by user commands and later the module should decide himself to switch the physical device.
That's why it seems to me natural to create a dummy ethernet device driver which does nothing else apart from forwarding the packets received from the IP stack to a real (= physical) network device. Therefore i need to fake that the packet was sent by the IP stack so as the physical device fill in correctly the protocol field in the header it adds.
Otherwise i thought i can do a transparent firewall that decides to which real interface to switch the packets after beeing sure that the physical device is running otherwise it should change.
One thing that may be difficult to implement is that i want to keep a TCP connection running when i change the physical device. That's why maybe the firewall solution may be better because when receiving packets i could fake that they all come from the same physical device and have therefore the same IP.
Thanks
Romain
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