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

[jungyu_park]

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

[syamantakomer · Accepted solution]

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.

[syamantakomer]

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.

[jungyu_park]

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

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

[jungyu_park]

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.

[syamantakomer]

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

[jungyu_park · Accepted solution]

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.