Re: SO_BINDTODEVICE or sendto using specific network interface

On Dec 12, 2005, at 18:17 , Alex Telitsine wrote:

On Dec 12, 2005, at 5:38 PM, Peter Sichel wrote:

On 12/12/05, Alex Telitsine wrote:

[snip]

I definitely have to bypass routing, since each interface will be

sending to the same destination (IP) address.

You mentioned previously that you want to send UDP via two physical

Ethernets simultaneously.  Notice the routing mechanism is designed to

determine the next hop physical hardware address.  If the destination IP

address is the same, what hardware address will you use as the next hop

destination for packets sent via each data link?

I'd guess router's MAC address. Satellite modem is the router. It connected directly via cross over to the ethernet port.

I ask because this might help clarify what you are trying to accomplish.

The data flow is something like this:

SRC1 192.168.0.20--->Modem/Router1-192.168.0.12-------+---------------->  DST 192.168.2.2

SRC2 192.168.1.20--->Modem/Router2-192.168.0.12-------+

Is the above supposed to show that both interfaces connect physically to the same modem/router?  If so, unless some extra configuration is happening on the modem/router, I don't see how the return trip will be made (what's the path from DST to 192.168.1.20?)

Regards,

Justin

--

Justin C. Walker, Curmudgeon at Large

Institute for General Semantics

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My wife 'n kids 'n dogs are gone,

I can't get Jesus on the phone,

But Ol' Milwaukee's Best is my best friend.

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