Could I reset a RJ45 port in a router or
by sorting of the 8 pins in the
RJ45 connector?

I got a strange router that if it's
powered on with the WAN port
connected, there would be no
internet.I dunno whether it's my
router's problem or the device
(ISP?) upstream from the WAN
port.

So maybe I could just reset the WAN
port by sorting 2 pins using a
little switch instead of re-plugging
the RJ45 cable at the WAN port. ;)

--

@~@ Simplicity is Beauty! Remain silent! Drink, Blink, Stretch!
/ v \ May the Force and farces be with you! Live long and prosper!!
/( _ )\ https://sites.google.com/site/changmw/
^ ^ https://github.com/changmw/changmw
The game is afoot... Meow...


--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On 8/25/2026 12:36 AM, Mr. Chang Man-wai wrote:

Could I reset a RJ45 port in a router or
by sorting of the 8 pins in the
RJ45 connector?

Sorry, not "sorting', but "shorting".
Sorry....

--

@~@ Simplicity is Beauty! Remain silent! Drink, Blink, Stretch!
/ v \ May the Force and farces be with you! Live long and prosper!!
/( _ )\ https://sites.google.com/site/changmw/
^ ^ https://github.com/changmw/changmw
The game is afoot... Meow...

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On Mon, 8/24/2026 12:36 PM, Mr. Chang Man-wai wrote:

Could I reset a RJ45 port in a router or
by sorting of the 8 pins in the
RJ45 connector?

I got a strange router that if it's
powered on with the WAN port
connected, there would be no
internet.I dunno whether it's my
router's problem or the device
(ISP?) upstream from the WAN
port.

So maybe I could just reset the WAN
port by sorting 2 pins using a
little switch instead of re-plugging
the RJ45 cable at the WAN port. ;)

Maybe you could re-flash the firmware on it ?

*******

Ethernet RJ45 ports are transformer-isolated.
There is no DC path between one side and the
other of the transformer. Shorting the pins
would definitely have an effect... on the
pad drivers on the other side of the transformer.
But that does *nothing* to change the logical
state of anything.

This is an "Ethernet splitter selector switch".

https://www.amazon.ca/Gigabit-Network-Splitter-Selector-Support/dp/B0CL8XVQ77

When you use the plastic knob on the splitter,
it would be like unplugging the wire, only switch-operated.
It's an eight pole double-throw switch. The second
port on the two-port side, is not used and the X means
"not connected to anything".

--------->\
\__________Out----> router
X-->

The only question about junk like this, is the
quality of the switch. Is it a good switch, or
would it wear out rapidly ? We don't know.
The top of the box is labeled "A" and "B", and
the switch moves side to side.

To use the splitter selector switch, you must
purchase at least one extra cable.

Paul

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On 8/25/2026 1:50 AM, Paul wrote:

I got a strange router that if it's
powered on with the WAN port
connected, there would be no
internet.I dunno whether it's my
router's problem or the device
(ISP?) upstream from the WAN
port.

So maybe I could just reset the WAN
port by sorting 2 pins using a
little switch instead of re-plugging
the RJ45 cable at the WAN port. ;)

Maybe you could re-flash the firmware on it ?

How could firmware reset the RJ45 port
if the RJ45 port was not designed to
allow a reset? From the Google results
(with and without A.I.)I collected,
I failed to see a method to do it.

The simplest and maybe the most
beautiful method is to just re-plug
the RJ45 cable. :)


--

@~@ Simplicity is Beauty! Remain silent! Drink, Blink, Stretch!
/ v \ May the Force and farces be with you! Live long and prosper!!
/( _ )\ https://sites.google.com/site/changmw/
^ ^ https://github.com/changmw/changmw
The game is afoot... Meow...

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On 8/25/2026 1:50 AM, Paul wrote:

--------->\
\__________Out----> router
X-->

The only question about junk like this, is the
quality of the switch. Is it a good switch...

Do I always need to buy something to solve
a problem that doesn't need something? :)

Could a RJ45 unplug be effected without
actually unplugging the RJ45 cable using
just some simple switches?

Then I remember the relay switch sound
in high-end audio equipment when you
turn them on. Maybe that's the solution.


--

@~@ Simplicity is Beauty! Remain silent! Drink, Blink, Stretch!
/ v \ May the Force and farces be with you! Live long and prosper!!
/( _ )\ https://sites.google.com/site/changmw/
^ ^ https://github.com/changmw/changmw
The game is afoot... Meow...

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On Tue, 8/25/2026 7:53 AM, Mr. Chang Man-wai wrote:

On 8/25/2026 1:50 AM, Paul wrote:

ÿÿÿ --------->\
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿ \__________Out----> router
ÿÿÿÿÿÿÿÿÿ X-->

The only question about junk like this, is the
quality of the switch. Is it a good switch...

Do I always need to buy something to solve
a problem that doesn't need something? :)

Could a RJ45 unplug be effected without
actually unplugging the RJ45 cable using
just some simple switches?

Then I remember the relay switch sound
in high-end audio equipment when you
turn them on. Maybe that's the solution.

You could flash the firmware on the router.

You could change the firmware to one of the open firmwares.
This requires knowledge of the amount of flash NAND and
the amount of RAM onboard the router.

The router could be responsible for terminating PPPOE,
which would require an account and password. You would
have to transfer the setup information, in the event
that information got deleted from the router.

Paul

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On 8/25/2026 9:10 PM, Paul wrote:

The router could be responsible for terminating PPPOE,

It is just a plain simple DHCP connection.

--

@~@ Simplicity is Beauty! Remain silent! Drink, Blink, Stretch!
/ v \ May the Force and farces be with you! Live long and prosper!!
/( _ )\ https://sites.google.com/site/changmw/
^ ^ https://github.com/changmw/changmw
The game is afoot... Meow...

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On Tue, 8/25/2026 2:07 PM, Mr. Chang Man-wai wrote:

On 8/25/2026 9:10 PM, Paul wrote:

The router could be responsible for terminating PPPOE,

It is just a plain simple DHCP connection.

No, it is not. The WAN side of the router, has protocol
analysis capability.

This is the ONLY reason I bought my first router. It terminated
PPPOE on the WAN side. You had to enter your ISP username and
ISP password as authentication.

Another protocol is PPPOA, and the router has room in the
interface for VPI:VCI entries, such as 0:35 might be popular
for the purpose. ATM is 53 byte packets. PPPOE might be
1500 byte packets. The LAN side of the router is then
"plain Ethernet" with no encapsulation. PPPOE is
Point to Point Protocol Over Ethernet, which is the same
concept as PPP was over dialup networking.

Paul

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On 8/25/2026 12:36 AM, Mr. Chang Man-wai wrote:

Could I reset a RJ45 port in a router or
by sorting of the 8 pins in the
RJ45 connector?

I got a strange router that if it's
powered on with the WAN port
connected, there would be no
internet.I dunno whether it's my
router's problem or the device
(ISP?) upstream from the WAN
port.

Could I further postulate that
when a simple RJ45 connection
behaved like this, somewhere
in the wires had a curse? ;)

Was Ethernet creasted and
designed to detect dark
magic? Really?

--

@~@ Simplicity is Beauty! Remain silent! Drink, Blink, Stretch!
/ v \ May the Force and farces be with you! Live long and prosper!!
/( _ )\ https://sites.google.com/site/changmw/
^ ^ https://github.com/changmw/changmw
The game is afoot... Meow...

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On Fri, 8/28/2026 11:30 PM, Mr. Chang Man-wai wrote:

On 8/25/2026 12:36 AM, Mr. Chang Man-wai wrote:

Could I reset a RJ45 port in a router or
by sorting of the 8 pins in the
RJ45 connector?

I got a strange router that if it's
powered on with the WAN port
connected, there would be no
internet.I dunno whether it's my
router's problem or the device
(ISP?) upstream from the WAN
port.

Could I further postulate that
when a simple RJ45 connection
behaved like this, somewhere
in the wires had a curse? ;)

Was Ethernet created and
designed to detect dark
magic? Really?

Ethernet isn't particularly cursed.

Modern Ethernet is fully transformer isolated. It's a relatively
low impedance, and an attempt at characteristic termination on the
end, so that there is reduction of reflections on the cable.

-----\||/--------------\||/---RX+
/||\ /||\ ~ 100 ohm termination
\||/ \||/ ~ One of four pairs
-----/||\--------------/||\---RX-

... ...
... ...
... ...

Wire
MAC - PHY - XFMR ~~~~~~~~~~~~ XFMR - PHY - MAC

One of the purposes of the transformers, is any common-mode
noise, it cancels out at the other end. There is also
no DC path (no ground connection). You cannot draw sparks
from the Ethernet pins due to some DC offset. The caps
on the ground plane, have a 2kV breakdown voltage. You need
something like this, as part of ESD (electrostatic discharge)
protection.

It's otherwise pretty ordinary and boring.

The PHY, converts the signals on Wire to things the MAC can
use. The MAC is the Media Access Controller.

Paul

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On 8/25/2026 1:50 AM, Paul wrote:

Maybe you could re-flash the firmware on it ?

How you find the true firmware of
the wifi router? Everything might
have been compromised by now. :)

And if the router chips were NOT
designed to allow a connection
reset, what could firmware do?
Absolutely nothing. You can only
re-plug the RJ45 cables, or more
correctly, to re-plug the RJ45
plugs.

I am NOT going against any kind
of wireless devices, but a wire
should always be a wire, NOT a
broken or damaged wire.

And I don't wanna talk about
curses and spells. Meow...

--

@~@ Simplicity is Beauty! Remain silent! Drink, Blink, Stretch!
/ v \ May the Force and farces be with you! Live long and prosper!!
/( _ )\ https://sites.google.com/site/changmw/
^ ^ https://github.com/changmw/changmw
The game is afoot... Meow...

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On 8/30/2026 3:14 AM, Paul wrote:

Ethernet isn't particularly cursed.

Modern Ethernet is fully transformer isolated. It's a relatively
low impedance, and an attempt at characteristic termination on the
end, so that there is reduction of reflections on the cable.

It's otherwise pretty ordinary and boring.

The PHY, converts the signals on Wire to things the MAC can
use. The MAC is the Media Access Controller.

Then it's a contact problem between
the crystal-clear RJ45 plug and the
black socket, and the 8x2 wires
involved.

[+]---------------------------------

I guess contacts can be cursed with
ease? :)

--

@~@ Simplicity is Beauty! Remain silent! Drink, Blink, Stretch!
/ v \ May the Force and farces be with you! Live long and prosper!!
/( _ )\ https://sites.google.com/site/changmw/
^ ^ https://github.com/changmw/changmw
The game is afoot... Meow...

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On Sun, 8/30/2026 5:03 AM, Mr. Chang Man-wai wrote:

On 8/25/2026 1:50 AM, Paul wrote:

Maybe you could re-flash the firmware on it ?

How you find the true firmware of
the wifi router? Everything might
have been compromised by now. :)

And if the router chips were NOT
designed to allow a connection
reset, what could firmware do?
Absolutely nothing. You can only
re-plug the RJ45 cables, or more
correctly, to re-plug the RJ45
plugs.

I am NOT going against any kind
of wireless devices, but a wire
should always be a wire, NOT a
broken or damaged wire.

And I don't wanna talk about
curses and spells. Meow...

Have you looked at the router settings ?

What did you find in there ?

Paul

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On 8/30/2026 6:02 PM, Paul wrote:

Have you looked at the router settings ?
What did you find in there ?

Totally irrelevant, Your Curiosity.

--

@~@ Simplicity is Beauty! Remain silent! Drink, Blink, Stretch!
/ v \ May the Force and farces be with you! Live long and prosper!!
/( _ )\ https://sites.google.com/site/changmw/
^ ^ https://github.com/changmw/changmw
The game is afoot... Meow...

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On 8/25/2026 12:36 AM, Mr. Chang Man-wai wrote:

Could I reset a RJ45 port in a router or
by sorting of the 8 pins in the
RJ45 connector?

Wait... wait ... wait...

Anyone remember something called
port-sensing?


--

@~@ Simplicity is Beauty! Remain silent! Drink, Blink, Stretch!
/ v \ May the Force and farces be with you! Live long and prosper!!
/( _ )\ https://sites.google.com/site/changmw/
^ ^ https://github.com/changmw/changmw
The game is afoot... Meow...

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On Sun, 8/30/2026 6:06 AM, Mr. Chang Man-wai wrote:

On 8/30/2026 6:02 PM, Paul wrote:

Have you looked at the router settings ?
What did you find in there ?

Totally irrelevant, Your Curiosity.

Did you find two URLs, one controls settings,
one points to the web site with the firmware ?

Rental routers can be totally locked down,
they can expose settings (you're allowed into that section),
or a totally unlocked router you can disable
the two URLs.

Some ISPs even have the capability to "take over"
your rental router from their side.

Paul

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)

On 8/31/2026 12:33 AM, Paul wrote:

Rental routers can be totally locked down,
they can expose settings (you're allowed into that section),
or a totally unlocked router you can disable
the two URLs.

Some ISPs even have the capability to "take over"
your rental router from their side.

You do NOT trust rental routers, do you?
Unless your ISP forces you to use it, or
maybe.... bait you to use it.

Remember, those rental stuffs are hand-
touched by your ISP.... think curses &
spells.

Meow... :)


--

@~@ Simplicity is Beauty! Remain silent! Drink, Blink, Stretch!
/ v \ May the Force and farces be with you! Live long and prosper!!
/( _ )\ https://sites.google.com/site/changmw/
^ ^ https://github.com/changmw/changmw
The game is afoot... Meow...

--- PyGate Linux v1.5.19
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)