Phone not listed as DHCP client

[petrosyan_sonya]

Model	TP-Link TL-WR841N/ND v9
Firmware Version	OpenWrt 18.06.4 r7808-ef686b7292 / LuCI openwrt-18.06 branch (git-19.170.32094-4d6d8bc)
Kernel Version	4.9.184

Today I noticed that my phone has Internet access but is not listed in the DHCP clients. What is wrong and how do I (or should I?) fix it back to normal?

Here is System Log

Thu May  7 22:59:00 2020 daemon.notice hostapd: wlan0: AP-STA-DISCONNECTED 18:01:XX:XX:XX:XX
Thu May  7 23:00:21 2020 daemon.info dnsmasq-dhcp[1471]: DHCPINFORM(br-lan) 192.168.1.105 00:22:XX:XX:XX:XX
Thu May  7 23:00:21 2020 daemon.info dnsmasq-dhcp[1471]: DHCPACK(br-lan) 192.168.1.105 00:22:XX:XX:XX:XX Me-PC
Thu May  7 23:00:56 2020 daemon.info hostapd: wlan0: STA 18:01:XX:XX:XX:XX IEEE 802.11: authenticated
Thu May  7 23:00:56 2020 daemon.info hostapd: wlan0: STA 18:01:XX:XX:XX:XX IEEE 802.11: associated (aid 1)
Thu May  7 23:00:56 2020 daemon.notice hostapd: wlan0: AP-STA-CONNECTED 18:01:XX:XX:XX:XX
Thu May  7 23:00:56 2020 daemon.info hostapd: wlan0: STA 18:01:XX:XX:XX:XX WPA: pairwise key handshake completed (RSN)
Thu May  7 23:00:57 2020 daemon.info dnsmasq-dhcp[1471]: DHCPDISCOVER(br-lan) 18:01:XX:XX:XX:XX
Thu May  7 23:00:57 2020 daemon.info dnsmasq-dhcp[1471]: DHCPOFFER(br-lan) 192.168.1.102 18:01:XX:XX:XX:XX
Thu May  7 23:00:57 2020 daemon.info dnsmasq-dhcp[1471]: DHCPREQUEST(br-lan) 192.168.1.102 18:01:XX:XX:XX:XX
Thu May  7 23:00:57 2020 daemon.info dnsmasq-dhcp[1471]: DHCPACK(br-lan) 192.168.1.102 18:01:XX:XX:XX:XX Phone

Mind how the phone is in Associated Stations but is not listed in Active DHCP Leases (the one that is actually in is a different phone I used to verify that DHCP works at all)

[lleachii]

@petrosyan_sonya, welcome to the community!

Did you reboot your router since you captured the log - and before the screenshot?

[petrosyan_sonya]

I just did. All is fine now. The problem was that a different phone showed up instantly when I turned it on. But when I did the same with the phone in question, nothing happened. Thank you.

[trendy]

Active DHCP leases are stored under /tmp which is erased when device is rebooted. So when you reboot, the active leases are vanished and the clients need to request once again IP to appear.

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