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dhcp assigend IP addresses seem to be lost on Android phones after a while

Markus Schiemer

Good morning, 

maybe someone can point me into the right direction :-).

What happens:

If an Android phone manually connects to the WLAN, everything is OK (Radius logs, DHCP logs on XG,... all show "success").

After a while (I was not yet able to identify how much "a while" is), the device is still connected to the WLAN (shows up on the WLAN mgmt tools and the mobile itself reports to be connected as well), but the device does not have an IP address any longer. Switching off and on WLAN on the device makes it work again. Often, this outage happens during late evening or early morning (to be identified via last updated whether forecast etc) but it might also happen during working hours.

XG DHCP logs only say that the "initial" lease was successful (no expiration messages etc). No DHCP traffic during the time in question. The next log entry shows up as soon as WLAN is set off/on on the device. Lease time was set between 1440 and 2880 with no change with regards to the outages, max time=lease time, DHCP static mapping.

Did anyone face a similar condition/has an idea how to troubleshoot this?

Many thanks

Markus



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    Markus - I have seen/read that this has been a long standing issue with Android devices and the DHCP renewal process. Not sure if you can grab one and update it to the latest and greatest OS and fixes and see if it stops for that device.  Another quick fix would be to set to a static ip manually and see if it continues to communicate as it should.  There is always a process of elimination that can be done but I don't think this is a Sophos XG related issue only.  I can always be wrong!

    If none of those suggestions prove anything, then I would advise reaching out directly to support for further analysis and troubleshooting. 

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  • 0

    Markus - I have seen/read that this has been a long standing issue with Android devices and the DHCP renewal process. Not sure if you can grab one and update it to the latest and greatest OS and fixes and see if it stops for that device.  Another quick fix would be to set to a static ip manually and see if it continues to communicate as it should.  There is always a process of elimination that can be done but I don't think this is a Sophos XG related issue only.  I can always be wrong!

    If none of those suggestions prove anything, then I would advise reaching out directly to support for further analysis and troubleshooting. 

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