WR841ND host don't see each other on the LAN

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schnee
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Joined: 14 Apr 2019
Posts: 9

PostPosted: Mon Aug 19, 2019 19:12    Post subject: WR841ND host don't see each other on the LAN Reply with quote
Hi,

i have an issue on one of the TP-Link TL-WR841ND v12 running DD-WRT v3.0-r38132 std (12/28/1Cool. The router is configured as a 5 port switch following the istructions from https://wiki.dd-wrt.com/wiki/index.php/Switch

Everything works, but the hosts attached to the LAN ports can't reach each other. When i look at the ARP entries it is clear that they can't resolve the other host's MAC address:

Code:
root@host1:~# arp
Address     HWtype  HWaddress               Flags Mask       Iface
router       ether      XX:XX:XX:XX:01:46 C                     eth0
host2        (incomplete)                                                eth0


Any idea what could be wrong?

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Schnee
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h8red
DD-WRT Guru


Joined: 28 Jun 2011
Posts: 577
Location: Vilnius, Lithuania

PostPosted: Mon Aug 19, 2019 22:25    Post subject: Re: WR841ND host don't see each other on the LAN Reply with quote
schnee wrote:
Any idea what could be wrong?


Save these lines into administration/startup and reboot:

swconfig dev eth1 set enable_vlan 1
swconfig dev eth1 set apply

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[Ramips] Nexx WT3020F Openwrt @kernel #4.14.143 (OpenVPN server, Wireguard server, AD blocking, SQM QOS, USB)
schnee
DD-WRT Novice


Joined: 14 Apr 2019
Posts: 9

PostPosted: Tue Aug 20, 2019 1:52    Post subject: Re: WR841ND host don't see each other on the LAN Reply with quote
h8red wrote:
schnee wrote:
Any idea what could be wrong?


Save these lines into administration/startup and reboot:

swconfig dev eth1 set enable_vlan 1
swconfig dev eth1 set apply


Thanks! Tried ti test the commands above in the router console, but i received an error:
Code:
swconfig dev eth1 set enable_vlan 1
Failed to connect to the switch. Use the "list" command to see which switches are available.


Listed which devices are availabe:
Code:
swconfig list
Found: switch0 - eth0



Should i change the eth1 to eth0?

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Schnee
kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 2273
Location: Texas, USA

PostPosted: Tue Aug 20, 2019 8:49    Post subject: Reply with quote
schnee wrote:
Should i change the eth1 to eth0?


Yes.
schnee
DD-WRT Novice


Joined: 14 Apr 2019
Posts: 9

PostPosted: Tue Aug 20, 2019 11:46    Post subject: Re: WR841ND host don't see each other on the LAN Reply with quote
h8red wrote:
schnee wrote:
Any idea what could be wrong?


Save these lines into administration/startup and reboot:

swconfig dev eth1 set enable_vlan 1
swconfig dev eth1 set apply


Applied it with eth0 from the command line, but it did not help. Actually i was unable to reach any devices on the switch.

Before the change i see that all ports are in vlan 0:
Code:
swconfig dev eth0 show
Global attributes:
        enable_vlan: 0
        mirror_monitor_port: 15
Port 0:
        enable_mirror_rx: 0
        enable_mirror_tx: 0
        pvid: 0
        link: port:0 link:up speed:1000baseT full-duplex txflow rxflow
Port 1:
        enable_mirror_rx: 0
        enable_mirror_tx: 0
        pvid: 0
        link: port:1 link:up speed:100baseT full-duplex auto
Port 2:
        enable_mirror_rx: 0
        enable_mirror_tx: 0
        pvid: 0
        link: port:2 link:up speed:100baseT full-duplex auto
Port 3:
        enable_mirror_rx: 0
        enable_mirror_tx: 0
        pvid: 0
        link: port:3 link:up speed:100baseT full-duplex auto
Port 4:
        enable_mirror_rx: 0
        enable_mirror_tx: 0
        pvid: 0
        link: port:4 link:up speed:100baseT full-duplex auto
VLAN 0:
        vid: 0
        ports: 0 1 2 3 4



After the change:
Code:
swconfig dev eth0 show
Global attributes:
        enable_vlan: 1
        mirror_monitor_port: 15
Port 0:
        enable_mirror_rx: 0
        enable_mirror_tx: 0
        pvid: 0
        link: port:0 link:up speed:1000baseT full-duplex txflow rxflow
Port 1:
        enable_mirror_rx: 0
        enable_mirror_tx: 0
        pvid: 0
        link: port:1 link:up speed:100baseT full-duplex auto
Port 2:
        enable_mirror_rx: 0
        enable_mirror_tx: 0
        pvid: 0
        link: port:2 link:up speed:100baseT full-duplex auto
Port 3:
        enable_mirror_rx: 0
        enable_mirror_tx: 0
        pvid: 0
        link: port:3 link:up speed:100baseT full-duplex auto
Port 4:
        enable_mirror_rx: 0
        enable_mirror_tx: 0
        pvid: 0
        link: port:4 link:up speed:100baseT full-duplex auto
VLAN 0:
        vid: 0
        ports: 0 1 2 3 4

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Schnee
schnee
DD-WRT Novice


Joined: 14 Apr 2019
Posts: 9

PostPosted: Tue Aug 20, 2019 11:55    Post subject: Re: WR841ND host don't see each other on the LAN Reply with quote
made a few more checks:
Code:
nvram show | grep vlan.*ports | sort
size: 20872 bytes (44664 left)
vlan0ports=1 2 3 4 5*
vlan1ports=0 5
root@:~# nvram show | grep port.*vlans | sort
size: 20872 bytes (44664 left)
port0vlans=1
port1vlans=0
port2vlans=0
port3vlans=0
port4vlans=0
port5vlans=0 1 16
root@:~# nvram show | grep vlan.*hwname | sort
size: 20872 bytes (44664 left)
vlan0hwname=et0
vlan1hwname=et0



Maybe i have to move port 0 to the same vlan as port 1-4 or port 1-4 to the same vlan as port 0?

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Schnee
schnee
DD-WRT Novice


Joined: 14 Apr 2019
Posts: 9

PostPosted: Thu Aug 22, 2019 11:56    Post subject: Re: WR841ND host don't see each other on the LAN Reply with quote
Any suggestion? I am remote to the system, so a bit hesitant to experiment on my own
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Schnee
Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 5191
Location: Akershus, Norway

PostPosted: Sun Sep 01, 2019 9:28    Post subject: Reply with quote
What chip-set do you have? The V12 is not listed on Wikidevi.
h8red
DD-WRT Guru


Joined: 28 Jun 2011
Posts: 577
Location: Vilnius, Lithuania

PostPosted: Sun Sep 01, 2019 11:10    Post subject: Reply with quote
It should be QCA9533-AL3A
https://openwrt.org/toh/tp-link/tl-wr841nd

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Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 5191
Location: Akershus, Norway

PostPosted: Sun Sep 01, 2019 12:28    Post subject: Reply with quote
1) Disregard the NVRAM variables. They are only for Broadcom.

2) The WAN port is directly connected to eth1. You cannot assign it to switch.

3) Switch ports: 0=CPU, 1-4 is LAN 4-1 (in reverse order)
schnee
DD-WRT Novice


Joined: 14 Apr 2019
Posts: 9

PostPosted: Wed Sep 04, 2019 1:15    Post subject: Reply with quote
Per Yngve Berg wrote:
1) Disregard the NVRAM variables. They are only for Broadcom.

2) The WAN port is directly connected to eth1. You cannot assign it to switch.

3) Switch ports: 0=CPU, 1-4 is LAN 4-1 (in reverse order)


Thanks! In my setup the WAN port is connected to the main router. Hosts on the switch ports (1-4) can't see each other. They can see everything else on the LAN and on the WIFI network.

This is the current bridign table: br0 no ath0 eth0 eth1

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Schnee
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