R201P - What is causing these Random SIGTERM's

Products Residential Wi-Fi
1

Can someone explain to me why we get random SIGTERM on this R-201P router - Such as these two actual listing from the Router’s Syslog? It acts like the SIGTERM is possibly causing the router to reboot sometimes.

Number 1

<Sat Aug 2 19:59:37 2025> udhcpd[7511]: Received a SIGTERM
<Sat Aug 2 19:59:41 2025> udhcpd[22013]: udhcpd (v1.12.1) started
<Sat Aug 2 19:59:41 2025> udhcpd[22013]: max_leases=235 is too big, setting to 155

Number 2

<Sat Aug 2 20:36:28 2025> LinkStatus: WAN Link Down
<Sat Aug 2 20:36:55 2025> LinkStatus: WAN Link Up
<Sat Aug 2 20:36:57 2025> ipphone[19044]: Account param is changed
<Sat Aug 2 20:36:58 2025> ipphone[19042]: Start Register Client …
<Sat Aug 2 20:37:05 2025> udhcpd[18379]: Received a SIGTERM
<Sat Aug 2 20:37:09 2025> LinkStatus: LAN1 Link Down
<Sat Aug 2 20:37:09 2025> LinkStatus: LAN2 Link Down
<Sat Aug 2 20:37:09 2025> LinkStatus: LAN3 Link Down
<Sat Aug 2 20:37:09 2025> LinkStatus: LAN4 Link Down
<Sat Aug 2 20:37:09 2025> udhcpd[1681]: udhcpd (v1.12.1) started
<Sat Aug 2 20:37:09 2025> udhcpd[1681]: max_leases=235 is too big, setting to 155
<Sat Aug 2 20:37:19 2025> LinkStatus: LAN1 Link Up
<Sat Aug 2 20:37:20 2025> LinkStatus: LAN2 Link Up
<Sat Aug 2 20:37:20 2025> LinkStatus: LAN3 Link Up
<Sat Aug 2 20:37:20 2025> LinkStatus: LAN4 Link Up

2

SIGTERM is not random in this case.

When the WAN interface goes down, the router initiates a reconfiguration of its network services (e.g., DHCP/PPPoE).

As part of this, the system sends a SIGTERM to stop udhcpd, so it can be restarted with updated configuration (e.g., new gateway IP, DNS, routes).

LAN interfaces also go down/up as part of this process; LAN interfaces reset is triggered by the system to force all clients to refresh their config.

From the logs

Number 1: The DHCP daemon is cleanly shut down and restarted. This is a controlled reinitialization, not a reboot.

Number 2: This is a full network stack reset due to WAN flapping, still not a reboot.

If you are experiencing frequent reboots, please check the reboot reason displayed in cnMaestro under the device details

Additionally, if possible, invite our support team to your cnMaestro account so we can directly investigate the issue. This will help us identify whether the reboots are due to configuration changes, firmware issues, watchdog resets, or hardware faults.

1 Like