How can I connect two LANs?

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How can I connect two LANs?

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How can I connect two LANs?
How can I connect two LANs?
2020-10-08 22:26:11 - last edited 2021-04-18 10:50:26
Model: TL-R470T+  
Hardware Version: V6
Firmware Version: 6.0.2 Build 20180211 Rel.60963

My setup for router is:

Port 1: WAN 1

Port 2: WAN 2

Port 3: LAN 1

Port 4: LAN 2

Port 5: LAN 3

 

WANs are confugired as failover, WAN 1 being primary. All LANs are connected by a WiFi router with separate subnets (C-class), DHCP server and NAT. With router all LANs are with same VLAN (untagged).

 

When using LAN 1, LAN 2 or LAN 3 Internet access works.From any LAN to any LAN access is not possible.

 

My question is: Can I configure the TL-R470T+ to allow routing between my LANs? If yes, please advice how this could be done...

 

Thanks in advance!

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Re:How can I connect two LANs?-Solution
2020-10-11 08:14:11 - last edited 2021-04-18 10:50:26

Dear @LanceSackless,

 

The LANs have a WiFi router of their own each. 

LAN 1: 192.168.76.0/24

LAN 2: 192.168.24.0/24

LAN 3: 192.168.42.0/24

 

Client at 192.168.24.0 cannot reach service at 192.168.42.0 or vice versa. Same goes from any LAN to any LAN. From all LANs both WANs are reachable as is Internet. Router cannot access LANs but can access Internet.

 

Each router is a NAT device which works like firewall to protect the clients behind each router. The clients connected to router A cannot see the clients connected to router B at all due to the NAT firewall. If you want those clients to talk with each other, you may contact the support of your WiFi router and check if you can disable the NAT on the WiFi routers, or you may need to do port forwarding (virtual server) on the router to allow the connection.

2022 TP-Link Wi-Fi 7 Product Launch Event | Watch the Replay at https://www.tp-link.com/us/wifi7/event/.
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Re:How can I connect two LANs?
2020-10-10 07:52:58 - last edited 2021-04-18 10:50:26

Dear @LanceSackless,

 

Can I configure the TL-R470T+ to allow routing between my LANs? If yes, please advice how this could be done...

 

No, the routing or ACL rules cannot take effect between LANs.

 

Basically, from any LAN to any LAN access is possible on the router. (test by Ping command)

Say there are 3 devices connected to the 3 LANs on the router, whose IP addresses are 192.168.0.100/101/102 respectively.

Then the device 192.168.0.100 can successfully ping the devices 192.168.0.101 and 102, and vice versa.

Note: if it's not, check the firewall settings on the devices, ensure the ping request is not blocked.

 

All LANs are connected by a WiFi router with separate subnets (C-class), DHCP server and NAT. With router all LANs are with same VLAN (untagged). When using LAN 1, LAN 2 or LAN 3 Internet access works.From any LAN to any LAN access is not possible.

 

Is one of the 3 LANs connected to a WiFi router or all of the 3 LANs are connected to 3 WiFi router respectively?

What do you mean that from any LAN to any LAN access is not possible, how do you test it? May I know your demand in detail?

2022 TP-Link Wi-Fi 7 Product Launch Event | Watch the Replay at https://www.tp-link.com/us/wifi7/event/.
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Re:How can I connect two LANs?
2020-10-10 10:17:57 - last edited 2021-04-18 10:50:26

@Fae 

Fae wrote

Dear @LanceSackless,

 

Can I configure the TL-R470T+ to allow routing between my LANs? If yes, please advice how this could be done...

 

No, the routing or ACL rules cannot take effect between LANs.

 

Basically, from any LAN to any LAN access is possible on the router. (test by Ping command)

Say there are 3 devices connected to the 3 LANs on the router, whose IP addresses are 192.168.0.100/101/102 respectively.

Then the device 192.168.0.100 can successfully ping the devices 192.168.0.101 and 102, and vice versa.

Note: if it's not, check the firewall settings on the devices, ensure the ping request is not blocked.

 

All LANs are connected by a WiFi router with separate subnets (C-class), DHCP server and NAT. With router all LANs are with same VLAN (untagged). When using LAN 1, LAN 2 or LAN 3 Internet access works.From any LAN to any LAN access is not possible.

 

Is one of the 3 LANs connected to a WiFi router or all of the 3 LANs are connected to 3 WiFi router respectively?

What do you mean that from any LAN to any LAN access is not possible, how do you test it? May I know your demand in detail?

 

The LANs have a WiFi router of their own each.

 

LAN 1: 192.168.76.0/24

LAN 2: 192.168.24.0/24

LAN 3: 192.168.42.0/24

 

TP-TL470T+: 192.168.254.0/24

 

WAN 1: 192.168.100.0/24

WAN 2: 192.168.10.0/24

 

Client at 192.168.24.0 cannot reach service at 192.168.42.0 or vice versa. Same goes from any LAN to any LAN. From all LANs both WANs are reachable as is Internet. Router cannot access LANs but can access Internet.

 

Connection tested with netcat.

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Re:How can I connect two LANs?-Solution
2020-10-11 08:14:11 - last edited 2021-04-18 10:50:26

Dear @LanceSackless,

 

The LANs have a WiFi router of their own each. 

LAN 1: 192.168.76.0/24

LAN 2: 192.168.24.0/24

LAN 3: 192.168.42.0/24

 

Client at 192.168.24.0 cannot reach service at 192.168.42.0 or vice versa. Same goes from any LAN to any LAN. From all LANs both WANs are reachable as is Internet. Router cannot access LANs but can access Internet.

 

Each router is a NAT device which works like firewall to protect the clients behind each router. The clients connected to router A cannot see the clients connected to router B at all due to the NAT firewall. If you want those clients to talk with each other, you may contact the support of your WiFi router and check if you can disable the NAT on the WiFi routers, or you may need to do port forwarding (virtual server) on the router to allow the connection.

2022 TP-Link Wi-Fi 7 Product Launch Event | Watch the Replay at https://www.tp-link.com/us/wifi7/event/.
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#4
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Re:How can I connect two LANs?
2020-10-11 21:06:20 - last edited 2021-04-18 10:50:26

@Fae Thanks so much for your help!

 

Although I had suspison I might be reaching over my head with this one, the tips you provided might just work for the very few services I have running that need be common with all LANs (DNS being one).

 

edit. I can also confirm that the virtual server solution works as I can now send logs over LANs as well as from the router to LAN.

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Re:How can I connect two LANs?
2020-10-12 00:41:58 - last edited 2021-04-18 10:50:26

Dear @LanceSackless,

 

Welcome~

Glad to hear that it helps. Thank you for your valued reply and hope you enjoy the internet!

2022 TP-Link Wi-Fi 7 Product Launch Event | Watch the Replay at https://www.tp-link.com/us/wifi7/event/.
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