RE: [Q] how to make two Ethernet card listen to same port?
- From: "Looney, Jason" <Jason.Looney@xxxxxxxxxxxx>
- To: "'oracle-l@xxxxxxxxxxxxx'" <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 31 Aug 2004 16:59:37 -0600
Sol,
1) Correct.
2) 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@xxxxxxxxx]
Sent: Monday, August 30, 2004 2:42 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: [Q] how to make two Ethernet card listen to same port?
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.
HTH & YMMV
HAND
On Mon, 30 Aug 2004 15:30:38 -0500, stephen.lee@xxxxxxxx
<stephen.lee@xxxxxxxx> wrote:
>
> You must define more than one listener.
>
>
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