I've noticed that I lose internet connection for about 10 seconds once per hour.
First this happened at around 28 minutes past the hour. My initial thought was that the service provider renews the lease for the public IP once per hour. I contacted the service provider, but they said that this isn't the case. I then rebooted the modem (initiated a few minutes past the hour). After the reboot, the connection is lost at a few seconds to six minutes past the hour ... every hour.
I currently use firmware RUT2XX_R_00.01.13.2, but noticed the same behaviour with firmware version previously installed (RUT2XX_R_00.01.12).
Topology
RUT240 (bridge mode) > Router > Switch > Computer
Performed troubleshooting
- Log files for router and switching equipment has been reviewed without finding any records indicating an issue.
- The log displayed in the user interface shows no entries related to the issue.
- Simultaneous ping command to three addresses (one to a public DNS server, one to the RUT240 and one to the router; hence, to the modem, an upstream address and a downstream address) resulted in the modem and the public DNS server not responding during the outage (20:05:55 to 20:06:04 in the example below), but the router continued to respond.
Conclusion
Hence, I conclude that the RUT240 causes the issue.
Questions
Could it be a setting that needs to be changed, or an issue that can be fixed in a firmware release?
Supporting information
Extract from continuous ping to 1.1.1.1:
2021-01-28 20:05:54 - Reply from 1.1.1.1: bytes=32 time=31ms TTL=55
2021-01-28 20:05:59 - Request timed out.
2021-01-28 20:06:04 - Request timed out.
2021-01-28 20:06:05 - Reply from 1.1.1.1: bytes=32 time=28ms TTL=55
Extract from the logread command (run in CLI):
Thu Jan 28 20:05:57 2021 daemon.notice netifd: ppp_4 (2726): udhcpc: sending renew to 10.0.52.253
Thu Jan 28 20:05:57 2021 daemon.notice netifd: ppp_4 (2726): udhcpc: bind(UDP): Cannot assign requested address
Thu Jan 28 20:05:57 2021 daemon.notice netifd: ppp_4 (2726): udhcpc: sending renew to 0.0.0.0
Thu Jan 28 20:05:57 2021 daemon.notice netifd: ppp_4 (2726): udhcpc: lease of 10.0.52.254 obtained, lease time 7200
Thu Jan 28 20:05:57 2021 local1.info hotplug-gsmstate[6114]: envACT: ifupdate
Thu Jan 28 20:05:57 2021 local1.info hotplug-gsmstate[6114]: envDEV: wwan0
Thu Jan 28 20:06:05 2021 local1.notice fwblock[6574]: Started fwblock
Other posts:
Scanning the forum, it could be the following posts seemingly related to the same issue:
