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Communication between network interfaces in different subnets LEDE openWRT

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MicBar

i'm using TP-Link MR3220v2 with its Openwrt firmware. what I would like to do should be simple, but I am not succeeding. i have 3 devices in two different subnets and i would enable communication through each devices (i don't know if i can say that i would like "bridge" the 2 subnets). this is the devices list:

my pc (IP 192.168.1.65) my openwrt modem (LAN interface IP 192.168.1.1) a third device that generates its wifi network (SSID "DESKTOP-CDTLO95-6027") (IP 192.168.137.1) i connect TP-LINK to my pc via ethernet cable ("LAN" interface of TP-LINK modem) and then i connect the TP link modem to wifi network of the third devices. then i create the new network interface called "wwan" (related to the wifi network "DESKTOP-CDTLO95-6027") with DHCP client protocol.

network interfaces before adding relayd bridge

i follow this tutorial

https://oldwiki.archive.openwrt.org/doc/recipes/relayclient

to "connect" the "LAN" and "WWAN" interfaces (using relayd). i set the IPV4

settings of relayd interface

that the client network assigns to my router (it is the only one in range 192.168.137.X that i can ping) but when i try to ping the device IP (192.168.137.1) from my pc (192.168.1.65) i don't recive response.

how can implement a bridge over the WWAN (wifi) and the LAN (ethernet) interfaces? am i okay to use relay for this purpose? are there any way to set up a bridge between wifi/eth different subnet?

Best regards

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