## Mechanical switch

### Mechanical switch

Hi!

How could I build a mechanical switch, that would either
connect the net computer (Net c.) to the work computer
(Work c.) via ethernet, as in the case 1), or connect
the net computer to the Internet via isdn, as in the case 2)?

Case 1)

(eth) |------------| (isdn)
|--------|-o        o-|----------- Internet
Work c.   |        | |       /  |
----     |  (eth) | |      /   | (isdn)
|- |-----|   |----|-|...../   -|-----|
|  |         |    |------------|     |
|  |         |                       |
----  Net c. |                       |
----  |                       |
|- |--|                       |
|  |                          |
|  |--------------------------|
----

Case 2)

(eth) |------------| (isdn)
|--------|-o        o-|----------- Internet
Work c.   |        |  \       | |
----     |  (eth) |   \      | | (isdn)
|- |-----|   |----|-   \.....|-|-----|
|  |         |    |------------|     |
|  |         |                       |
----  Net c. |                       |
----  |                       |
|- |--|                       |
|  |                          |
|  |--------------------------|
----

It would be great if I, for example, could just modify an electrical
switch, by changing the wires. All practical ideas are wellcome!

Jussi

### Mechanical switch

Somewhere around Sun, 21 Apr 2002 21:52:51 +0200, Jussi was seen engraving
on a handy slab of granite:

Quote:> Hi!

> How could I build a mechanical switch, that would either connect the net
> computer (Net c.) to the work computer (Work c.) via ethernet, as in the
> case 1), or connect the net computer to the Internet via isdn, as in the
> case 2)?

> Case 1)

>                      (eth) |------------| (isdn)
>                   |--------|-o        o-|----------- Internet
>         Work c.   |        | |       /  |
>          ----     |  (eth) | |      /   | (isdn) |- |-----|
>          |----|-|...../   -|-----| |  |         |    |------------| | |
>          |         |                       | ----  Net c. |
>                        |
>                 ----  |                       |
>                 |- |--|                       |
>                 |  |                          |
>                 |  |--------------------------|
>                 ----

> Case 2)

>                      (eth) |------------| (isdn)
>                   |--------|-o        o-|----------- Internet
>         Work c.   |        |  \       | |
>          ----     |  (eth) |   \      | | (isdn) |- |-----|   |----|-
>          \.....|-|-----| |  |         |    |------------|     | |  |
>              |                       | ----  Net c. |
>             |
>                 ----  |                       |
>                 |- |--|                       |
>                 |  |                          |
>                 |  |--------------------------|
>                 ----

> It would be great if I, for example, could just modify an electrical
> switch, by changing the wires. All practical ideas are wellcome!

> Jussi

So let me get this straight :

You have 2 computers, each with an ethernet card, and an ISDN connection,
and you want to start screwing around with wires ?????

I'd say connect the net PC to both - always, at the same time.
This way, you can reach the Internet with either PC, and they can reach
eachother, as well...

Save you a LOT of shit for nothing...

Any (warped) idea of security you might have about this can be done quite
satisfactorily in software - provided you use a decent (as in SAFE) OS.

But then you know where you asked this question, right ?

Oh nice ASCII art by the way..

--
Confusion is my middle finger.

### Mechanical switch

> Somewhere around Sun, 21 Apr 2002 21:52:51 +0200, Jussi was seen engraving
> on a handy slab of granite:

> So let me get this straight :

> You have 2 computers, each with an ethernet card, and an ISDN connection,
> and you want to start screwing around with wires ?????

> I'd say connect the net PC to both - always, at the same time.
> This way, you can reach the Internet with either PC, and they can reach
> eachother, as well...

> Save you a LOT of shit for nothing...

> Any (warped) idea of security you might have about this can be done quite
> satisfactorily in software - provided you use a decent (as in SAFE) OS.

> But then you know where you asked this question, right ?

> Oh nice ASCII art by the way..

You are probably just right! Maybe I just am a stoneage enthusiast ;)

Jussi

### Mechanical switch

Somewhere around Mon, 22 Apr 2002 07:40:03 +0200, Jussi was seen engraving
on a handy slab of granite:

Quote:

> You are probably just right! Maybe I just am a stoneage enthusiast ;)

No, real stoneage would mean porting Linux to the Commodore 64 or
something...

Oh man, 8-bit Linux ! wow !

--
Confusion is my middle finger.

### Mechanical switch

Quote:> Somewhere around Mon, 22 Apr 2002 07:40:03 +0200, Jussi was seen engraving
> on a handy slab of granite:

> > You are probably just right! Maybe I just am a stoneage enthusiast ;)

> No, real stoneage would mean porting Linux to the Commodore 64 or
> something...

> Oh man, 8-bit Linux ! wow !

> --
> Confusion is my middle finger.

I think there's a minix-variant for c64 actually....

Khay.

### Mechanical switch

> Hi!

> How could I build a mechanical switch, that would either
> connect the net computer (Net c.) to the work computer
> (Work c.) via ethernet, as in the case 1), or connect
> the net computer to the Internet via isdn, as in the case 2)?

> Case 1)

>                      (eth) |------------| (isdn)
>                   |--------|-o        o-|----------- Internet
>         Work c.   |        | |       /  |
>          ----     |  (eth) | |      /   | (isdn)
>          |- |-----|   |----|-|...../   -|-----|
>          |  |         |    |------------|     |
>          |  |         |                       |
>          ----  Net c. |                       |
>                 ----  |                       |
>                 |- |--|                       |
>                 |  |                          |
>                 |  |--------------------------|
>                 ----

> Case 2)

>                      (eth) |------------| (isdn)
>                   |--------|-o        o-|----------- Internet
>         Work c.   |        |  \       | |
>          ----     |  (eth) |   \      | | (isdn)
>          |- |-----|   |----|-   \.....|-|-----|
>          |  |         |    |------------|     |
>          |  |         |                       |
>          ----  Net c. |                       |
>                 ----  |                       |
>                 |- |--|                       |
>                 |  |                          |
>                 |  |--------------------------|
>                 ----

> It would be great if I, for example, could just modify an electrical
> switch, by changing the wires. All practical ideas are wellcome!

> Jussi

Sure, you could do it. A good mechanical contact won't compromise
the signals too much.

I guess you try to 'secure' your work computer by this stunt. In which
case, it won't take much for an attacker to notice that the machine has
ethernet set up. So he leaves a little spy program in place to work out
details like ftp passwords and suchlike. After that your net computer
can be used as a file forwarding system in both directions. You'll only
slow your attacker down by a few days.

Ever used a mail based ftp relay? You send mail with, say,
'list ftp.someserver.dom/dir' in the body. Back comes mail with listing
of directory. Next day you send 'get ftp.someserver.dom/dir/filename'
and you get the file attached to a mail. Same would work for any other
service.

Regards,

Iwo

### Mechanical switch

Somewhere around Thu, 25 Apr 2002 11:54:10 +0200, Khayman was seen
engraving on a handy slab of granite:

Quote:

> I think there's a minix-variant for c64 actually....

Yes, but then again, minix is nowhere near an actual useful OS, now is it
?

--
Confusion is my middle finger.

### Mechanical switch

Quote:> Somewhere around Thu, 25 Apr 2002 11:54:10 +0200, Khayman was seen
> engraving on a handy slab of granite:

> > I think there's a minix-variant for c64 actually....

> Yes, but then again, minix is nowhere near an actual useful OS, now is it
> ?

> Read Linus' accounts of his trials for more info...

Well,.... neither is C64-Basic... :-)

Khay. (who still has a C-64 under the tv)

I'm trying to configure a backup www server but have only one IP and
one DSL line.

Is there such a thing as a switch that will allow me to temporaraly
swith my DSL line from server A to server B and back by mechanical
means (not software)?

Thanks