Re: [Q] how to make two Ethernet card listen to same port?

Well, if you read the original post clearly, they are talking about having two separate ethernet cards. Having multiple listeners, one for each IP that's on each network, is the way to do that.

Now, the catch is, let's say you have ethernet cards, one on network A and one on network B. The default route is on network A. When a connection comes in to network B's ethernet card from a network that is neither network A nor B, the incoming packets will hit network B's card, and then be routed back out through network A (though still with network B's source address). If network A becomes inaccessible in such a way the card doesn't notice, all connections to both A and B will fail. However, if network B fails, network A is still available.

(Note: this assumes you're not running any dynamic routing protocols like OSPF, RIP, etc., or using crafty NAT'ing firewalls to do on-the-fly address rewriting, or the like - basically, its assuming you've got a normal, vanilla IP network with routers and switches and servers and not much else.)

Thanks,
Matt

--
Matthew Zito
GridApp Systems
Email: mzito_at_gridapp.com
Cell: 646-220-3551
Phone: 212-358-8211 x 359
http://www.gridapp.com


On Aug 30, 2004, at 4:42 PM, sol beach wrote:



> Reality check time!

>

> 1) The Oracle listener ONLY handles initial connection requests & then

> gets out of the way

>

> 2) Keep in mind that Ethernet was orginally designed to run on coaxial 

> cable.

> This means that only a single piece of wire exists to transmit/recieve

> the signal.

> Only ONE device at a time can be transmitting on the cable at a time.

> Even if you could (which I don't think you can) get multiple process

> to listen on the same port,  there will only ever be a single "talker"

> transmitting at time. Therefore you'd gain NO

> benefit from having multiple listeners on the same SUBNET interface.

>


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