OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
  • Task Type Bug Report
  • Category Kernel
  • Assigned To No-one
  • Operating System All
  • Severity High
  • Priority Very Low
  • Reported Version lede-17.01
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by jiangyaohui - 16.08.2017

FS#963 - chips is qca9531, pc ping device ip fail or timeout with big size, exp: ping -l 65500

this problem is always occurs on.


  My device is router, chip is QCA9531.
  PC ip is, router ip is
  PC execute command "ping -l 65500 -t" fail or timeout.

Project Manager
Mathias Kresin commented on 28.08.2017 11:34

Which board are you using? Which LEDE revision?

jiangyaohui commented on 31.08.2017 03:08

my board is cf-e320n-v2, revision is r4433-680a5c5

Project Manager
Mathias Kresin commented on 31.08.2017 07:04

Please try a recent snapshot first. r4433-680a5c5 is > 2 month old. Might be that the issue is already fixed.

jiangyaohui commented on 31.08.2017 09:48

I update the latest code to r4768-89f8a01, this bug exist also.

Christian Lamparter commented on 31.08.2017 18:03

Hmm, there's a problem with your procedure.

In order to specify the size of a ping package, you have to use "-s" and not the "-l" parameter.

-l 65500 would mean that you "shotgun" all those packages and ping's manpage
( has the following to say about the parameter: "If preload is specified, ping sends that many packets not waiting for reply."

So, can you retry with ping -s 65500?
If it still fails, can you look at which point/size the package start to disappear?

Arjen de Korte commented on 31.08.2017 18:51

Note the OP indicated:

PC execute command "ping -l 65500 -t" fail or timeout.

I assume he's using Windows to send the ping command and in that case, the command is correct. In fact, I just tried this with my router and it does what is expected. In my case, the pings are answered by the router though.

jiangyaohui commented on 01.09.2017 02:17

Christian Lamparter:

  I use Windows to send the ping command, the command is same as Linux "ping -s 65500";
  ping the size 56710 OK;
  ping the size 56720 timeout sometimes;
  ping the size 65500 timeout always;
jiangyaohui commented on 23.10.2017 07:19

Does anyone pay attention to this bug? It looks like jumbo frames error, qualcomm's QSDK not this bug


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