topic dhcp request problem in 5Ghz wifi roaming on samsung s10. in Unleashed

dhcp request problem in 5Ghz wifi roaming on samsung s10.

jungyu_park — Sun, 30 Oct 2022 11:52:08 GMT

R610 / Unleashed 200.12.10.105.129

Hello.

Have any issue in the title been reported?
I sent data such as client logs and AP packet captures to Samsung for a month, but the answer I got back was, please contact the AP manufacturer.

The problem is that whenever my S10+ roams at 5Ghz, it gets a new dhcp.
It happens on both wpa2 and wpa3, no problem at 2.4Ghz.

I tested roaming on s10+, z flip3, tab s6 lite, tab s8, but there is only a problem with s10+ 5ghz.

I left a request again, including a google link with images of client trouble shooting, but I'm also posting here.

https://drive.google.com/drive/folders/1KwJQPJws09W5LmarJI21SF_uyV5L7pPh?usp=share_link

Re: dhcp request problem in 5Ghz wifi roaming on samsung s10.

Rao — Mon, 31 Oct 2022 13:16:08 GMT

Hi @jungyu_park,

We do not have any known issue with S10+ not being able to receive DHCP IP on 5Ghz radio. From the client troubleshooting screenshot provided, I can see that the DHCP ACK from the server is being forwarded to the client through AP. Would you be able to verify if a valid IP is seen in the DHCP ACK info field on the same client troubleshooting page? Additionally in order to fully trace the DHCP packet, we need to collect a packet capture from the AP 5ghz radio which will give more info on the problem. You can follow the step mentioned in https://docs.commscope.com/bundle/unleashed-200.11-onlinehelp/page/GUID-FE747C7C-8F63-409B-A423-63F898CA8331.html to gather the packet capture using which we can identify if the DHCP packets are forwarded to client or not.

Regards,

Rao

Re: dhcp request problem in 5Ghz wifi roaming on samsung s10.

syamantakomer — Mon, 31 Oct 2022 13:06:23 GMT

Hi @jungyu_park,

This seems like an issue on client device side because I do see roaming happening correctly (you can see re-association frames in the connection trace).

Please note, AP doesn't interrupt or temper client IP acquisition (other than VLAN configuration on WLAN and if you enable force DHCP).

A packet capture and AP logs may help here but for that I would suggest opening a support case for better troubleshooting and quicker resolution.

Re: dhcp request problem in 5Ghz wifi roaming on samsung s10.

jungyu_park — Mon, 31 Oct 2022 13:28:10 GMT

Hello.
Thank you for answer.
I also think it's a client's problem, but I don't know how much Samsung will care about the S10+, which is close to EOL.

Re: dhcp request problem in 5Ghz wifi roaming on samsung s10.

jungyu_park — Mon, 31 Oct 2022 13:28:50 GMT

I have additionally uploaded the packet capture files I sent to Samsung to the Google Drive link.

Re: dhcp request problem in 5Ghz wifi roaming on samsung s10.

syamantakomer — Mon, 31 Oct 2022 15:18:23 GMT

Looking at the capture, I found a weird thing, FT roaming is enabled on SSID but still 4 way handshake is happening post re-association.

Logically you will not see 4 way handshake happening separately if FT roaming is enabled and when client roams from one AP to another.

Re: dhcp request problem in 5Ghz wifi roaming on samsung s10.

jungyu_park — Mon, 31 Oct 2022 15:44:05 GMT

Perhaps FT was not working at the time of capture.
Just recaptured.

https://drive.google.com/drive/folders/1E57OiWGpdbKksqirpzfWiXyh772MQvgN?usp=sharing

Re: dhcp request problem in 5Ghz wifi roaming on samsung s10.

jungyu_park — Mon, 31 Oct 2022 16:03:54 GMT

Even if I reserve the ip from the DHCP server, the problem still occurs, but if I set a static ip in the s10+ wifi setting, the problem does not occur.
It seems to me that this is a problem that Samsung needs to fix.

I'll leave an inquiry to Samsung once again with a more detailed explanation.

Re: dhcp request problem in 5Ghz wifi roaming on samsung s10.

syamantakomer — Mon, 31 Oct 2022 17:43:05 GMT

Yes, this is what I was suspecting, its an end user device issue.

Re: dhcp request problem in 5Ghz wifi roaming on samsung s10.

jungyu_park — Tue, 01 Nov 2022 03:48:16 GMT

There was a firmware update for the s10+ this morning. (G975NKSU7HVJ5)

Samsung replied to my inquiry, "Please talk to the AP manufacturer", and "if you have any additional questions, you should ask again with a new log."

But strangely, after updating to the new firmware, the problem cannot be reproduced.

That's right. Now, even when roaming at 5Ghz, dhcp does not renew.

It feels like it's been resolved.

Re: dhcp request problem in 5Ghz wifi roaming on samsung s10.

syamantakomer — Tue, 01 Nov 2022 14:21:30 GMT

Great, this means it was an issue with phone's software and Samsung was not ready to accept it.

You may want to post the results/solution with Samsung and ask them how it got fixed by updating the device firmware.

Anyway, good to know that it is working fine now.