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

From: Looney, Jason <Jason.Looney_at_echostar.com>
Date: Tue, 31 Aug 2004 16:59:37 -0600
Message-ID: <B8C9CF34B3F7164282C8610C93BB94AF04C63318@riv-exchb1.echostar.com>

Sol,

Correct.
Newer ports (within the last 7 years) can talk and listen at the same time, it's called full duplex mode. Your assumption that multiple process can't listen on the same port (the better term here is socket) is true. But the assertion that there would be NO benefit for multiple listeners on the same SUBNET is not quite accurate either. It depends whether you have a HUB or a SWITCH. With a HUB every listening device receives message, but disregards it (single backplane). With a switch, each listening device receives only the messages that are intended for that device, thus filtering out much of the TCP traffic. The exception to this is UDP packets which every listener would receive. This makes DHCP configuration possible.

Jason.

-----Original Message-----
From: sol beach [mailto:sol.beach_at_gmail.com] Sent: Monday, August 30, 2004 2:42 PM
To: oracle-l_at_freelists.org
Subject: Re: [Q] how to make two Ethernet card listen to same port?

Reality check time!

The Oracle listener ONLY handles initial connection requests & then gets out of the way
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.

HTH & YMMV HAND On Mon, 30 Aug 2004 15:30:38 -0500, stephen.lee_at_dtag.com <stephen.lee_at_dtag.com> wrote:
>
> You must define more than one listener.
>
>

Please see the official ORACLE-L FAQ: http://www.orafaq.com

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Received on Tue Aug 31 2004 - 17:55:32 CDT