Selects eth device to send/receive

[SungHyun Nam]

Hello,

If there are two ethernet device, how I can select a device to send/receive?

Actually I want to do loopback test between twe ethernet device.
Send a UDP packet through eth0 and receives that packet from eth1 device.
And vice versa.

Regards,
namsh

[Ian Collins]

SungHyun Nam wrote:

Hello,

If there are two ethernet device, how I can select a device to send/receive?

Asking on a platform specific group would be a good start.

--
Ian Collins.

[Ivan Gotovchits]

Ian Collins wrote:

SungHyun Nam wrote:

>Hello,

If there are two ethernet device, how I can select a device to
send/receive?

Asking on a platform specific group would be a good start.

If there're two diferent NICs, then they will have different IP's (if you\re
talking about TCP/IP).
So, when receive you need to specify the NIC address, not the INADDR_ANY,
anf to send you must specify address of the desired NIC.

[Walter Roberson]

In article <fa**********@aioe.org>,
Ivan Gotovchits <iv*************@auriga.ru, cr*****@gmail.comwrote:

>Ian Collins wrote:

>SungHyun Nam wrote:

>>If there are two ethernet device, how I can select a device to
send/receive?

>Asking on a platform specific group would be a good start.

>If there're two diferent NICs, then they will have different IP's (if you\re
talking about TCP/IP).

No, that's merely how it happens on the systems you've encountered.
IP addresses need not be associated with particular NICs -- and
*aren't*, once you get into high-reliability systems which have to
keep going smoothly even when individual NICs fail (or their
network link goes down.)
--
Is there any thing whereof it may be said, See, this is new? It hath
been already of old time, which was before us. -- Ecclesiastes

[Ivan Gotovchits]

Walter Roberson wrote:

In article <fa**********@aioe.org>,
Ivan Gotovchits <iv*************@auriga.ru, cr*****@gmail.comwrote:

>>Ian Collins wrote:

>>SungHyun Nam wrote:

>>>If there are two ethernet device, how I can select a device to
send/receive?

>>Asking on a platform specific group would be a good start.

>>If there're two diferent NICs, then they will have different IP's (if
you\re talking about TCP/IP).

No, that's merely how it happens on the systems you've encountered.
IP addresses need not be associated with particular NICs -- and
*aren't*, once you get into high-reliability systems which have to
keep going smoothly even when individual NICs fail (or their
network link goes down.)

So, can you specify what stack do you use? Because it is really
stack-dependent question, or even platform dependend if it is not POSIX
stack.
Or you can use multicast or broadcast addresses and send messages containing
some magic numbers defining the NIC that sends it. So you can verify that
all transmissions was ok.

[CBFalconer]

Ivan Gotovchits wrote:

Ian Collins wrote:

>SungHyun Nam wrote:

>>>
If there are two ethernet device, how I can select a device to
send/receive?

Asking on a platform specific group would be a good start.

If there're two diferent NICs, then they will have different IP's
(if you\re talking about TCP/IP). So, when receive you need to
specify the NIC address, not the INADDR_ANY, anf to send you must
specify address of the desired NIC.

Please don't even attempt to answer OT queries on c.l.c. The
experts to correct mistakes are not present here. Limit your
response to advice on what newsgroups to ask on.

--
Chuck F (cbfalconer at maineline dot net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home.att.net>

--
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