Topic: [V] How to move Ethernet port to a separate LAN network?

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Post #1

mward15

24 Dec 2016, 11:29

TL-WR841ND has four LAN and one WAN port.
I need to split the LAN ports into two networks: 1, 2, 3 --> LAN 1 ||| 4 --> LAN 2
Here are the default configs for this router before my experiments:

swconfig dev switch0 show :

Global attributes:
        enable_vlan: 1
Port 0: # <<< Seems to be a "CPU port" (not a physical port)
        pvid: 1
        link: port:0 link:up speed:1000baseT full-duplex txflow rxflow 
Port 1:
        pvid: 1
        link: port:1 link:up speed:100baseT full-duplex auto
Port 2:
        pvid: 1
        link: port:2 link:up speed:100baseT full-duplex auto
Port 3:
        pvid: 1
        link: port:3 link:down
Port 4: <<<  Port which I want to move to a separate LAN
        pvid: 1
        link: port:4 link:up speed:100baseT full-duplex auto
VLAN 1:
        vid: 1
        ports: 0 1 2 3 4

cat /etc/config/network :

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'XXXX:XXXX:XXXX::/XX'

config interface 'lan'
        option ifname 'eth0'
        option force_link '1'
        option type 'bridge'
        option proto 'static'
        option ipaddr '192.168.10.1'
        option netmask '255.255.255.0'
        option ip6assign '60'

config interface 'wan'
        option ifname 'eth1'
        option proto 'dhcp'
        option macaddr 'XX:XX:XX:XX:XX:XX'

config interface 'wan6'
        option ifname 'eth1'
        option proto 'dhcpv6'

config switch
        option name 'switch0'
        option reset '1'
        option enable_vlan '1'

config switch_vlan
        option device 'switch0'
        option vlan '1'
        option ports '0 1 2 3 4'

One of my attempts - tried to replace "config switch_vlan" with the following:

config switch_vlan 'eth0_0'
    option device 'switch0'
    option vlan '1'
    option ports '0 1 2 3 5t'

config switch_vlan 'eth0_1'
    option device 'switch0'
    option vlan '2'
    option ports '4 5t'

but it caused the loss of connection for all the Ethernet connected PC's (could only restore /etc/config/network through WiFi)

Please, could you give a small example of how to move Port 4 to a separate network?

(Last edited by mward15 on 25 Dec 2016, 11:17)

Post #2

mk24

24 Dec 2016, 13:48

Port 0 is the CPU port so you make it tagged in both VLANs.

config switch_vlan
    option device 'switch0'
    option vlan '1'
    option ports '0t 1 2 3'

config switch_vlan 
    option device 'switch0'
    option vlan '2'
    option ports '0t 4'

Since the CPU is now tagged, refer to the two networks as eth0.1 and eth0.2. Do not have a plain eth0 in any of the configurations. So you need to change the ifname in lan to be eth0.1 Create a new lan2 and connect eth0.2 to it.

Post #3

mward15

24 Dec 2016, 22:45

mk24 wrote:

Port 0 is the CPU port so you make it tagged in both VLANs.
config switch_vlan
    option device 'switch0'
    option vlan '1'
    option ports '0t 1 2 3'

config switch_vlan 
    option device 'switch0'
    option vlan '2'
    option ports '0t 4'
Since the CPU is now tagged, refer to the two networks as eth0.1 and eth0.2. Do not have a plain eth0 in any of the configurations. So you need to change the ifname in lan to be eth0.1 Create a new lan2 and connect eth0.2 to it.

Thank you very much for helping, mk24! I have posted the final working configs to a thread with ID 69050 on this forum ( "[V] How to ban the Internet WAN traffic for a specific Ethernet port?" ) Have a great time ahead!

(Last edited by mward15 on 25 Dec 2016, 11:18)

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