TP Link WR841ND switch ports not working

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user4721
DD-WRT Novice


Joined: 12 Jun 2014
Posts: 6

PostPosted: Thu Jun 12, 2014 11:40    Post subject: TP Link WR841ND switch ports not working Reply with quote
Hello, i recently flashed my TL-WR841ND ver 8.2 to dd-wrt firmware BrainSlayer-V24-preSP2 › 2014 › 05-27-2014-r24160

All seems to work fine with the exception i can't make the machine connected to it able to see eachothers.

The router is 192.168.1.1

The machines are:

192.168.1.2
192.168.1.3
192.168.1.4

All connected on the WR841ND yellow ports.

If i try to ping the router (192.168.1.1) from every machines it works..

If i try to ping any other machine from the first one, example

192.168.1.2 try to ping 192.168.1.3 or 192.168.1.4 this fails...

It seems like the computers are isolated, they can only connect to the router..

I tried also the Switch guide from dd-wrt wiki but with any good result.

Any advice?

thank you ^^
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user4721
DD-WRT Novice


Joined: 12 Jun 2014
Posts: 6

PostPosted: Thu Jun 12, 2014 12:29    Post subject: Reply with quote
i also did a brctl show via telnet and this is the result:

Code:
root@DD-WRT:~# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.c04a0061f762       no                 eth1
                                                                         ath0
frankynov
DD-WRT Novice


Joined: 17 Nov 2013
Posts: 21

PostPosted: Fri Jun 13, 2014 23:55    Post subject: Reply with quote
Hello,

I've seen a similar behavior with this 24160 build on my 841N v8.4.
Wired clients couldn't see wireless clients or go out of the network.

So I flashed back to the 23919 build and it's working Smile
user4721
DD-WRT Novice


Joined: 12 Jun 2014
Posts: 6

PostPosted: Fri Jun 13, 2014 23:59    Post subject: Reply with quote
indeed :\ i had to flash back to a previous version

so it's actually a bug... i tough at the first was something vlan related but maybe not..

with the 23598 build all seems work fine
KrypteX
DD-WRT Guru


Joined: 18 Jan 2014
Posts: 2410

PostPosted: Tue Nov 11, 2014 12:54    Post subject: Reply with quote
I can confirm this bug in FW 25179 on a DIR-615 D2 ! I'll flash back to 23320 or 23919 now and try again.
Tou
DD-WRT Novice


Joined: 28 Nov 2011
Posts: 8

PostPosted: Tue Nov 11, 2014 17:55    Post subject: Reply with quote
I have this issue too.
Machines plugged into the switch ports can't access each other. But between WAN<>LAN communication is possible, also between WLAN<>WAN and WLAN<>LAN. So its only affecting connections between eth0(switch) stations. I am on svn 25251 with TP-Link TL-WR841ND v9.



Code:
root@DD-WRT:~# swconfig dev eth0 show
Global attributes:
        enable_vlan: 0
Port 0:
        pvid: 0
        link: port:0 link:up speed:1000baseT full-duplex txflow rxflow
Port 1:
        pvid: 0
        link: port:1 link:down
Port 2:
        pvid: 0
        link: port:2 link:up speed:100baseT full-duplex auto
Port 3:
        pvid: 0
        link: port:3 link:down
Port 4:
        pvid: 0
        link: port:4 link:down
VLAN 0:
        vid: 0
        ports: 0 1 2 3 4
Code:
root@DD-WRT:~# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.c46e1f7eb8a0       no              eth0
                                                        eth1
                                                        ath0.1
br1             8000.c46e1f7eb8a0       no
KrypteX
DD-WRT Guru


Joined: 18 Jan 2014
Posts: 2410

PostPosted: Tue Nov 11, 2014 18:34    Post subject: Reply with quote
Your observation is not entirely accurate.
I can, for example, ping from my laptop (on WiFi) an Android phone (on WiFi), but cannot ping another laptop (also on WiFi). All are under the same router, with IPs of the form 192.168.1.x.
Tou
DD-WRT Novice


Joined: 28 Nov 2011
Posts: 8

PostPosted: Tue Nov 11, 2014 18:45    Post subject: Reply with quote
KrypteX wrote:
Your observation is not entirely accurate.
I can, for example, ping from my laptop (on WiFi) an Android phone (on WiFi), but cannot ping another laptop (also on WiFi). All are under the same router, with IPs of the form 192.168.1.x.


yes WLAN<>WLAN is working. The issue seems to only affect the wired switch ports.
KrypteX
DD-WRT Guru


Joined: 18 Jan 2014
Posts: 2410

PostPosted: Tue Nov 11, 2014 18:55    Post subject: Reply with quote
Tou wrote:
KrypteX wrote:
Your observation is not entirely accurate.
I can, for example, ping from my laptop (on WiFi) an Android phone (on WiFi), but cannot ping another laptop (also on WiFi). All are under the same router, with IPs of the form 192.168.1.x.


yes WLAN<>WLAN is working. The issue seems to only affect the wired switch ports.


Please read again what I've just written. I said I CAN'T PING a laptop from another laptop, both connected to WiFi. So WLAN<->WLAN pinging doesn't work in all situations !
Pike of the lake
DD-WRT Novice


Joined: 06 Oct 2014
Posts: 10

PostPosted: Tue Nov 11, 2014 18:56    Post subject: Solution for v9 Reply with quote
Hi,

I think that I had the same problem as you are talking about. Each computer connected to the router would not communicate with each other. I have a TL-WR841N v9.0

CyB3R solved it for me:

CyB3R wrote:

(2) LAN clients are mutually unreachable. The only remedy is to add this script to startup.
Code:
swconfig dev eth0 set enable_vlan 1
swconfig dev eth0 set apply

This solves the problem for me.
KrypteX
DD-WRT Guru


Joined: 18 Jan 2014
Posts: 2410

PostPosted: Tue Nov 11, 2014 19:00    Post subject: Re: Solution for v9 Reply with quote
Pike of the lake wrote:
Hi,

I think that I had the same problem as you are talking about. Each computer connected to the router would not communicate with each other. I have a TL-WR841N v9.0

CyB3R solved it for me:

CyB3R wrote:

(2) LAN clients are mutually unreachable. The only remedy is to add this script to startup.
Code:
swconfig dev eth0 set enable_vlan 1
swconfig dev eth0 set apply

This solves the problem for me.


I get that, but I'll say again:
"I CAN'T PING a laptop from another laptop, both connected to WiFi ! So WLAN<->WLAN pinging doesn't work in all situations !" This problem isn't related ONLY to LAN clients, but also to SOME WiFi clients.
Tou
DD-WRT Novice


Joined: 28 Nov 2011
Posts: 8

PostPosted: Tue Nov 11, 2014 19:38    Post subject: Re: Solution for v9 Reply with quote
Pike of the lake wrote:
Hi,

I think that I had the same problem as you are talking about. Each computer connected to the router would not communicate with each other. I have a TL-WR841N v9.0

CyB3R solved it for me:

CyB3R wrote:

(2) LAN clients are mutually unreachable. The only remedy is to add this script to startup.
Code:
swconfig dev eth0 set enable_vlan 1
swconfig dev eth0 set apply

This solves the problem for me.


Thank you! This fixed it for me too!
KrypteX
DD-WRT Guru


Joined: 18 Jan 2014
Posts: 2410

PostPosted: Sat Nov 15, 2014 6:45    Post subject: Reply with quote
I think the problem is actually the Windows Firewall blocking a response to an incoming ping. I've found these articles:

http://www.sysprobs.com/enable-ping-reply-windows-7

http://answers.microsoft.com/en-us/windows/forum/windows_7-networking/how-to-enable-ping-response-in-windows-7/5aff5f8d-f138-4c9a-8646-5b3a99f1cae6

http://www.ehow.com/how_6933661_let-ping-through-windows-firewall.html

http://forums.whirlpool.net.au/archive/1998864
YaddaMinski
DD-WRT User


Joined: 24 Oct 2010
Posts: 294

PostPosted: Sat Nov 15, 2014 10:35    Post subject: Reply with quote
When testing router setup, it is best to disable firewall if you are not sure it is not blocking ping. Also, disable VPN software.
KrypteX
DD-WRT Guru


Joined: 18 Jan 2014
Posts: 2410

PostPosted: Sat Nov 15, 2014 10:37    Post subject: Reply with quote
YaddaMinski wrote:
When testing router setup, it is best to disable firewall if you are not sure it is not blocking ping. Also, disable VPN software.

You say the router's firewall or the Windows firewall ?
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