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GS110TP - DHCP Issue - Obtaining IP not possible
Hi everyone, I have an issue with my GS110TP when trying to obtain an IP from DHCP. This issue I already dicussed here, but as I noticed it was not already solved. It seems to be an issue of the...
Hi Harry,
Tried to reproduce the behavior by using software packet generator to inject both untagged and tagged DHCP request packets form more than five hours but in vain, not sure if the time is long enough, do you know how long will the behavior presents after reset of reload? And if it is possible to provide untagged and tagged DHCP request packets for further test?
Furthermore, what is the behavior of the device regarding to DHCP offer packets? Will the device withdraw DHCP offer packets?
Hi Harry,
Sorry, there was a mistake in my previous post, it should be "DHCP Discover" packets, not "DHCP offer" packets.
In addition, would you please help to provide the information below as well for further analysis?
1. Configuration file of GS110TP.
2. Address-table when the issue presents.
3. MAC address(es) of the Ubiquiti device interface(s) that connected to GS110TP.
4. DHCP configuration of Ubiquiti device, especially pool and lease time.
Thanks for considering my request.
Hi Byrolin,
thanks for your attention to my issue.
I try to answer your questions - if I forget something, please give me a hint.
Just another important information I detected while actually testing again:
When a new Client, which was not active for a longer time, connects the AP it will get an IP Address!
But on same time, a client which was connected and active to one of the other APs, the device stucks in the loop "Obtaining IP" ... " Disconnected" ... "Obtaining IP" ... "Diconnected" ...
And this is what I have seen in Wireshark, that the DHCP Discover of this device is not forwarded to the correct port from GS110TP.
After I changed (randomized) the MAC of the client which stucked in the loop, the client connects within the next second without any further issues.
So in my opinion, there seems to be something wrong with MAC-cache or something similar - without knowing much how the device is working!
Thanks in advance!
Harry
Following are the informations you requested:
Dear Byron,
attached you will find all requested Screenshots.
The guest VLAN is tagged with 100 - but it is not often used. Maybe thats why the USG ( fc:ec:da:43:c2:7a ) is not in address list for VLAN100?
On Unifi USG I dont have to define PVID etc. I only define if and which VLAN should be used (tagged) for a "network".
Hopefully you will find the info you expect to get a clear view.
Because I dont know how to upload more than one file (??) except inline of text, please download the screenshots with following link:
http://koepfnet.de/GS110TP_details.zip
Thanks in advance,
Harry
Hi Harry,
Thanks for the prompt response, got all the screenshots and looking on them now.
Will update to you if anything is figured out.
Best Regards
Byron
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