| Sysop: | Amessyroom |
|---|---|
| Location: | Fayetteville, NC |
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I am shortly to be upgraded from FFTC to FFTP.
Currently the incoming connection to the master socket then goes to the "Broadband Connector (RJ45)" on the back of the ISP's router. I have a second
router that then plugs into the WAN socket of the first router (Double NAT and
more control)
That all works very well.
However I gather that when FFTP is installed the connection from the ONT to the
router uses the WAN socket on the ISP's router, so is it then correct to use one
of the LAN ports for the second router?
RayG <x@invalid.net> wrote:
I am shortly to be upgraded from FFTC to FFTP.
Currently the incoming connection to the master socket then goes to the
"Broadband Connector (RJ45)" on the back of the ISP's router. I have a second
router that then plugs into the WAN socket of the first router (Double NAT and
more control)
I think the 'broadband connector' is likely to be a phone connector - more likely to be RJ11 not RJ45 (although the difference doesn't really matter, and it is possible to put an RJ11 plug in an RJ45 socket).
It's possible that if you do that your ISP router than provisions the WAN socket to be a fifth LAN port[*]. Otherwise I don't think you would be able to
connect downstream devices there. ie this is a mistake but you got away
with it this time.
If you move the second router cable to a LAN port on the first, everything should continue to work.
That all works very well.
However I gather that when FFTP is installed the connection from the ONT to the
router uses the WAN socket on the ISP's router, so is it then correct to use one
of the LAN ports for the second router?
If you're happy with double NAT, the only change is that the cable from the ONT will plug into the WAN ethernet port on the router rather than the phone inlet. Everything else will stay the same. You can try this now by moving your second router to a LAN port in advance of your upgrade.
Theo
[*] many routers have their 5 ethernet ports 1xWAN+4xLAN wired as a 5-port VLAN tagged switch, with WAN as one VLAN and LAN as another. Changing a WAN port to LAN is just about changing the VLAN settings on the switch port, which is a very small configuration change.
On 14/08/2025 16:35, Theo wrote:
RayG <x@invalid.net> wrote:
I am shortly to be upgraded from FFTC to FFTP.
Currently the incoming connection to the master socket then goes to the
"Broadband Connector (RJ45)" on the back of the ISP's router. I have a second
router that then plugs into the WAN socket of the first router (Double NAT and
more control)
I think the 'broadband connector' is likely to be a phone connector - more >> likely to be RJ11 not RJ45 (although the difference doesn't really matter, >> and it is possible to put an RJ11 plug in an RJ45 socket).
It's possible that if you do that your ISP router than provisions the WAN
socket to be a fifth LAN port[*]. Otherwise I don't think you would be able to
connect downstream devices there. ie this is a mistake but you got away
with it this time.
If you move the second router cable to a LAN port on the first, everything >> should continue to work.
That all works very well.
However I gather that when FFTP is installed the connection from the ONT to the
router uses the WAN socket on the ISP's router, so is it then correct to use one
of the LAN ports for the second router?
If you're happy with double NAT, the only change is that the cable from the >> ONT will plug into the WAN ethernet port on the router rather than the phone >> inlet. Everything else will stay the same. You can try this now by moving >> your second router to a LAN port in advance of your upgrade.
Theo
[*] many routers have their 5 ethernet ports 1xWAN+4xLAN wired as a 5-port >> VLAN tagged switch, with WAN as one VLAN and LAN as another. Changing a WAN >> port to LAN is just about changing the VLAN settings on the switch port,
which is a very small configuration change.
Thanks for the info Theo, (I always get my connectors mixed up, sorry)
Out of interest, why do you want double NAT and a second router?
RayG <x@invalid.net> wrote:
I am shortly to be upgraded from FFTC to FFTP.
Currently the incoming connection to the master socket then goes to the "Broadband Connector (RJ45)" on the back of the ISP's router. I have a second
router that then plugs into the WAN socket of the first router (Double NAT and
more control)
I think the 'broadband connector' is likely to be a phone connector - more likely to be RJ11 not RJ45 (although the difference doesn't really matter, and it is possible to put an RJ11 plug in an RJ45 socket).
I am shortly to be upgraded from FFTC to FFTP.
Currently the incoming connection to the master socket then goes to the >"Broadband Connector (RJ45)" on the back of the ISP's router. I have a second >router that then plugs into the WAN socket of the first router (Double NAT and
more control)
That all works very well.
However I gather that when FFTP is installed the connection from the ONT to the
router uses the WAN socket on the ISP's router, so is it then correct to use one
of the LAN ports for the second router?
Thanks