NR7302 ethernet connection interupts under heavy VPN loads

jesperwj · June 2025

Good morning.
I’m having some issues with my NR7302 Outdoor router, where when some systems on the network are using a VPN and doing large file transfers the ethernet interface gets marked as down. In all other cases, such as under other heavy loads this is not the case.
The modem is connected to a router running OPNsense, through the provided cables and PoE injector. The modem is configured in IP Passthrough mode, and is running firmware version 1.00(ACHA.4)b5_F0.

Here is an excerpt from the log on the modem:

Timestamp	Level	Process	Message
Jun 26 08:29:10	info	cellwan	CM_SYSLOG: beCellIntfNsaConfigStatsUpdate; (Index: 1) Band: NR5G_N78, PhyCellID: 212, RSRP: -93, DL_BW: 60
Jun 26 08:29:10	info	cellwan	CM_SYSLOG: beCellIntfConfigStatsUpdate; Name: rmnet_data0, CurrentBand: LTE_BC7, CellID: 59952654, PhyCellID: 363, RSRP: -94, UL_BW: 20, DL_BW: 20
Jun 26 08:28:55	info	cellwan	CM_SYSLOG: beCellIntfNsaConfigStatsUpdate; (Index: 1) Band: NR5G_N78, PhyCellID: 212, RSRP: -93, DL_BW: 60
Jun 26 08:28:55	info	cellwan	CM_SYSLOG: beCellIntfConfigStatsUpdate; Name: rmnet_data0, CurrentBand: LTE_BC7, CellID: 59952654, PhyCellID: 363, RSRP: -94, UL_BW: 20, DL_BW: 20
Jun 26 08:28:54	info	httpd	zHttpd: Account: User `<REDACTED_USER>` login from host `CLIENT_IP`.
Jun 26 08:28:41	debug	dhcpd	dnsmasq-dhcp: sendLeaseMessageToESMD esmd ret=1
Jun 26 08:28:41	debug	dhcpd	dnsmasq-dhcp: sendLeaseMessageToESMD send to esmd buf = {"ac":"add","expire":"86765","mac":"DEVICE_MAC","ip":"CLIENT_IP",…,"cid":"01:DEVICE_MAC","ifname":"bridge0"}
Jun 26 08:28:41	info	dhcpd	dnsmasq-dhcp: sendLeaseMessageToESMD
Jun 26 08:28:33	info	cellwan	CM_SYSLOG: beCellIntfConfigStatsUpdate; Name: rmnet_data1, CurrentBand: LTE_BC7, CellID: 59952654, PhyCellID: 363, RSRP: -94, UL_BW: 20, DL_BW: 20
Jun 26 08:28:33	notice	esmd	esmd: Interface: eth0, Status: Up, Speed: 2500, DuplexMode: Full
Jun 26 08:28:29	err	dhcpd	dnsmasq-dhcp: failed to read /etc/ethers: No such file or directory
Jun 26 08:28:29	info	dhcpd	dnsmasq-dhcp: DHCP, IP range CLIENT_IP - CLIENT_IP, lease time 1d
Jun 26 08:28:28	notice	esmd	esmd: Interface: eth0, Status: Down
Jun 26 08:28:17	debug	dhcpd	dnsmasq-dhcp: sendLeaseMessageToESMD esmd ret=1
Jun 26 08:28:17	debug	dhcpd	dnsmasq-dhcp: sendLeaseMessageToESMD send to esmd buf = {"ac":"add","expire":"86741","mac":"DEVICE_MAC","ip":"CLIENT_IP",…,"cid":"01:DEVICE_MAC","ifname":"bridge0"}
Jun 26 08:28:17	info	dhcpd	dnsmasq-dhcp: sendLeaseMessageToESMD

I have tried a lot of different combinations of settings, both on the OPNsense router and the modem, to no avail. I wouldn’t consider the configuration to be particularly exotic, so I was somewhat surprised that I couldn’t find any mention of similar issues on this forum or otherwise.

I would appreciate any and all help on this. If there is any information that is missing in my post I would be more than happy to provide it.

Zyxel_Brandon · December 2025

Hi jesperwj,

Firmware 1.00(ACHA.4)b5_F0 is a customized release for Deutsche Telekom. If you experience any issues with the NR7302, please reach out to Deutsche Telekom.

Thanks.

jesperwj · February 12

Hello Brandon,

Thank you for your response.

I purchased the Zyxel NR7302 directly from the Zyxel Amazon store, and I am located in Italy using a WindTre SIM. For that reason, I was a bit surprised to learn that the installed firmware was a Deutsche Telekom customized version. If that is the standard firmware shipped with units sold through Amazon, I appreciate the clarification.

In any case, a firmware update released about a month after my original post appears to have resolved the issue. I simply forgot to follow up and confirm that the problem is no longer occurring.

Thank you again for your assistance.

Best regards,
Jesper W.J.

NR7302 ethernet connection interupts under heavy VPN loads

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