Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

FS#1819 - Switch in TL-WR841N v9 fails at random #8507

Closed
openwrt-bot opened this issue Aug 27, 2018 · 2 comments
Closed

FS#1819 - Switch in TL-WR841N v9 fails at random #8507

openwrt-bot opened this issue Aug 27, 2018 · 2 comments
Labels
flyspray

Comments

@openwrt-bot
Copy link

Sven:

Hi Folks,

I have problems with the switch in two TL-WR841N devices.

Hardware:
TP-Link TL-WR841N v9

Software version:
OpenWrt 18.06.1 (also in OpenWrt 18.06 and in LEDE 17.01.x)

Configuration:
Running as simple wireless access point. dnsmasq, iptables and odhcpd are disabled. static ip adress configured. No pppo[ea], no vlan.

Behaviour:
The switch stops working, so no packets are switched between the ports (and also not to wifi or the device itself). This happens at random. Sometimes the problem appears twice a week, then it does not appear for 4-6 weeks.

What's NOT the root cause:
I changed the power supply to make sure the behaviour is not related to voltage/power problems. But this didn't change anything. Also high wifi or wired traffic don't seem to be the reason because sometimes the problem occurs at night. There is only idle traffic during night hours. Yes, I am sure about that.

Workaround:
ssh'ing to the device over wireless works, after issuing /etc/init.d/network restart everything runs smooth again.

I thought that the problem discussed in FS#762 also applies to my WR841N, but was corrected that this is not the case (see the comments in that task).

What can I do to track down the problem?

Thanks and best regards,
Sven
@openwrt-bot
Copy link
Author

fredy:

Were you able to test in another hardware, same model, to eliminate the possibility to be a hardware issue ?

I have been seen and trying to identify some instability issues with 18.06 on more older hardware like this one (even though it has 32MB of RAM) due to its bigger footprint so I am interested to find out more if it make sense or not in order to make sure 18.06 is still an option for them or not.

I was going to say that if you don't have another hardware to test 18.06, you may try to downgrade it 17.01.6 and find out if you see the same issues but you already mentioned you tried both. Therefore it seems another indication it may be a hardware issue.

@openwrt-bot
Copy link
Author

Sven:

Sorry for the late reply, @Fredy. I wasn't notified by e-mail, so I saw your comment only by accident.

I first faced the problem on a TL-WR841N v9, which I then replaced by a TL-WR841ND v9 (notice the D at the end). Both devices have the same problem.

I already swapped the power supply, which did not help.

/etc/init.d/network restart
solves the problem, or alternatively
ifdown lan; ifup wan

How can I track down which exact command issued during ifdown/ifup fixes my problem?

Thanks!
Sven

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
flyspray
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
1 participant
@openwrt-bot