| To: | |
|---|---|
| Subject: | Re: [ts-7000] RE: ts-7800 how do I make 4 (at least 2) identical network stacks? |
| From: | Walter Marvin <> |
| Date: | Wed, 6 Nov 2013 07:33:21 -0800 (PST) |
The problem with technilogic is they don;t want to work enough to put out
stable products
--------------------------------------------
On Wed, 11/6/13, Jason Stahls <> wrote:
Subject: Re: [ts-7000] RE: ts-7800 how do I make 4 (at least 2) identical
network stacks?
To:
Date: Wednesday, November 6, 2013, 7:19 AM
Linux may work
as a RTOS, but a RTOS it
is not. QNX has been doing RTOS and nothing but for
over 20
years, hence "weird" things like this are
actually easy to do in
it :) You can probably run QNX on the 8700 fairly
easily with
some help from TS.
Jason Stahls
On 11/6/2013 8:34 AM, Jonathan Leslie wrote:
yeah, that's a deal breaker.
I've got the whole
interface to code up and handle, I need a quick
selector
switch between networks. Looks like I'm
gonna be sticking
with the winsystems board as multi-IP stacks are
simple with
them. The Sad part is I bet there is a simple
solution
with the TS-8700 as well, but I don't have
months to work it
out. Customer wants a quote now for 48 units
too.
From:
Walter Marvin <>
To:
Sent:
Tuesday, November 5, 2013 10:58 PM
Subject:
Re: [ts-7000] RE: ts-7800 how do I make
4 (at least
2) identical network stacks?
A full TCP stack is not a
trivial
exercise, but you can steal
most of the
code, and eliminate most of
it.Still, its
a multi month project and much
more work
than IP routing solutions
--------------------------------------------
On Tue, 11/5/13, Jonathan
Leslie
<>
wrote:
Subject: Re: [ts-7000] RE:
ts-7800 how do
I make 4 (at least 2)
identical network
stacks?
To: ""
<>
Date: Tuesday, November 5,
2013, 5:09 PM
LOL. I only run
as root. what about this IP
stack, what's
the difference
if its running under userspace
code or
part of the OS?
Seems like to me you are
only changing
who owns the
code. So the ts-8700 has
4
NIC's???
From:
""
<>
To:
Sent:
Tuesday, November 5, 2013 8:03
PM
Subject:
[ts-7000] RE: ts-7800 how do I
make 4 (at
least 2) identical
network stacks?
You can use raw ethernet
frames to
communicate
over a specific NIC under
Linux. However,
this imposes the
requirement that any
application using
that method must run
with root privilege. It also
means having
to craft a
substantial portion of an
already working
IP stack in your
own userspace code. Not
trivial.
---In
<>
wrote:
when you say raw
ethernet are you talking
sockets
connections or something
more "raw" than
that?
From: Walter Marvin
<>
To:
Sent: Tuesday, November
5, 2013 10:22 AM
Subject: Re:
[ts-7000] ts-7800 how do I
make 4 (at
least 2) identical
network stacks?
The same effect, however, can
be done
using raw
Ethernet on the receiving
side
--------------------------------------------
On Mon, 11/4/13, Eric Robishaw
<> wrote:
Subject: Re: [ts-7000] ts-7800
how do I
make 4 (at least 2)
identical network stacks?
To: ""
<>
Date: Monday, November 4,
2013, 9:08 PM
Maybe this is too simple...
But why not
just use
Udp broadcasting, let each
device receive
all the
messages
and filter out what they
don't need. No
need
for
special routing, etc..
On Monday, November 4, 2013,
Walter Marvin
wrote:
The mac address can be easily
found. The
problem
here is that Linux won't
accept the same
sub network
on
two different interfaces and
the IPs of
the remote boxes
can't be changed. This has
to be handled
by routing
below the interface level, or
raw
Ethernet.
--------------------------------------------
On Mon, 11/4/13, Joseph
Bouchard
<>
wrote:
Subject: Re: [ts-7000] RE:
ts-7800 how do
I make 4 (at
least
2) identical network
stacks?
To:
Date: Monday, November 4,
2013, 5:39 PM
Hi,
I've been following along
in the
background,
reading
about half of
what's been said, and
understanding less,
but I
haven't seen anyone
suggest this...
Can you use ARP to an
advantage here? The
normal way
I've used ARP is
when we have a terminal server
which has
not yet been
configured... you
arp the mac address to a
hostname on your
PC, then
connect
to the still
unconfigured box, and
configure it. Your
computer
knows
how
to find
that remote box by it's
mac address, even
if the
remote
box doesn't yet
know what it's IP address
is yet. Can we
do that
here?
Imagine this implementation...
You have 4
boxes which
all
want to have
the same IP address, but they
all have
different MAC
addresses, which
I'll refer to MAC1, MAC2,
etc. On your
TS7800 you
have
a plain old
single interface eth0 with the
address of
your choice,
and
a
typical
socket listener. When a client
connects,
you accept(),
like
you
normally would. It's been
years since I've
dealt
with the addr structs
the sockets use, but I'm
thinking there is
a way to
tie
a mac address to
the socket, or lacking that
use arp. At
that point
your
file descriptor
is working correctly and you
don't care
about IP
addresses, you are just
talking back and forth op that
open
socket.
Maybe I've missed some
critical detail,
but the
point
is
when you use
mac addresses, and/or
hostnames, and you
don't
worry
about addresses any
more.
Good luck,
Joe
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