3 wan (2 same ip, 1 different ip)

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sukinataferry

Commendable
Apr 28, 2016
3
0
1,510
dear friends,

i have 3 wan connected to TPLINK TL-R480T+ router
(http://www.tp-link.com/en/products/details/cat-4910_TL-R480T%2b.html)

modem1
wan: dynamic public ip
lan: 192.168.1.254, 255.255.255.0
dhcp: 192.168.1.1 - 253

modem2
wan: dynamic public ip
lan: 192.168.2.254, 255.255.255.0
dhcp: 192.168.2.1 - 253

modem3 (cannot change local ip, locked in firmware)
wan: static public ip
lan: 192.168.1.254, 255.255.255.0
dhcp: 192.168.1.1 - 253

connected to the router as:
wan1: 192.168.1.1
wan2: 192.168.2.1
wan3: 192.168.1.1

how to set in wan3 so the router will receive 192.168.3.254 instead of 192.168.1.254
to avoid problem, using NAT or any forwarding feature, without changing the modem1-3 local dhcp address.

thank you so much
ferry
 
Solution
B
I know little about that router. My guess is it still will not work because it will reject the assignment of the same ip to the wan even if you configure the NAT. The NAT is done after the packets arrive, as they arrive the ip will be duplicated on 2 interfaces.

You will need a different router between the modem3 and your tplink just to do the translations.
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B

bill001g

Titan
Aug 9, 2012
28,326
2,755
125,640
You can't one of the modems must be changed. This is one of those fundamental things related to how subnets work. You could of course put a device in between to do 1-1 nat (consumer router can't) and nat the complete subnet but that would be silly to do.

Best options is to change modem1 ip for the lan.
 
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S

sukinataferry

Commendable
Apr 28, 2016
3
0
1,510
dear bill001g,
thank you for your reply.

herewith the LAN NAT-NAT setting in router:
hopefully it can solve my problem, please help.
thank you

One-to-One NAT

Mapping IP Address: [IP] -> [IP]

Interface: [wan1] / [wan2] /[wan3]

DMZ Forwarding: [Enable] / [Disable]

Description: (Optional)

Status: [Activate] [Inactivate]
 
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B

bill001g

Titan
Aug 9, 2012
28,326
2,755
125,640
I know little about that router. My guess is it still will not work because it will reject the assignment of the same ip to the wan even if you configure the NAT. The NAT is done after the packets arrive, as they arrive the ip will be duplicated on 2 interfaces.

You will need a different router between the modem3 and your tplink just to do the translations.
 
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