No DHCP offered when in bridge mode.

ioannisKK

Since last week I cannot get an IP address on my personal device when the cable modem is set to bridge mode(modem mode). It was working nicely since months but suddenly stopped. I switched to routed mode and collected the last logs. I sanitized the mac address of my cable modem but not the CMTS one.

Time

Priority

Description

27-11-2023 21:24:47

notice

REGISTRATION COMPLETE - Waiting for Operational status

27-11-2023 21:24:46

warning

REG-RSP-MP Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:17:10:9a:5c:07;CM-QOS=1.1;CM-VER=3.1;

27-11-2023 21:24:40

notice

DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:17:10:9a:5c:07;CM-QOS=1.1;CM-VER=3.1;

27-11-2023 21:24:39

notice

TLV-11 - unrecognized OID;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:17:10:9a:5c:07;CM-QOS=1.1;CM-VER=3.1;

27-11-2023 21:24:26

warning

DHCP WARNING - Non-critical field invalid in response ;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:17:10:9a:5c:07;CM-QOS=1.1;CM-VER=3.1;

27-11-2023 21:24:23

critical

DHCP FAILED - Discover sent, no offer received;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:17:10:9a:5c:07;CM-QOS=1.1;CM-VER=3.1;

27-11-2023 21:24:07

critical

DHCP FAILED - Critical field invalid in response ;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:17:10:9a:5c:07;CM-QOS=1.1;CM-VER=3.1;

27-11-2023 21:24:06

critical

DHCP FAILED - Discover sent, no offer received;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:17:10:9a:5c:07;CM-QOS=1.1;CM-VER=3.1;

27-11-2023 21:23:58

critical

DHCP FAILED - Critical field invalid in response ;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:17:10:9a:5c:07;CM-QOS=1.1;CM-VER=3.1;

27-11-2023 21:23:57

critical

DHCP FAILED - Discover sent, no offer received;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:17:10:9a:5c:07;CM-QOS=1.1;CM-VER=3.1;

27-11-2023 21:23:53

notice

Honoring MDD; IP provisioning mode = IPv4

27-11-2023 21:23:53

critical

DHCP FAILED - Critical field invalid in response ;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:17:10:9a:5c:07;CM-QOS=1.1;CM-VER=3.1;

Any help really appreciated. Calling first level of support I was not able to have a solution to this issue.

The configuration on my side was not changed for the last month and it only stopped working last week.

thanks :-)

Ioannis

Daniele_Sunrise

ioannisKK Welcome to the community!

Your product has a total of 2 public IPs. If you have 2 devices connected to the Sunrise modem in bridge mode and now unplug one of them and plug in a new one, the new device will not have a public IP. The reason is that the lease of the IP takes 84600 seconds, which is about 24 hours.

This means that the IP is reserved for 24 hours after the device is unplugged. We recommend restarting the Sunrise modem to end the lease. You can then set the modem back to bridge mode and the IPs will be reassigned.

Greetings
Daniele

ioannisKK

Hello Daniele,

Thank you for your answer. Let me elaborate a bit more about the issue. For the last 6-7 months I have configured the Sunrise equipment to bridge mode and it was working until last week. I was on a business travel (and this means that I didn’t change the configuration myself) where suddenly it stopped working. I have connected my own equipment on port 1, from where I was getting the public IP address until last week. When I came back on Monday morning I realized that the internet connection was not working with the “bridge” mode. When I started troubleshooting I realized that initially (not anymore) the Sunrise equipment when in router mode it could provide a private IP address to my equipment although as just mentioned not anymore.

I always had 1 public IP address in my equipment and never had any configuration myself to have a second public IP.
Greetings

Ioannis

ioannisKK

Hi Daniel,

An update from my side. I tried again the bridge mode and this time I checked on my device which is sending the DHCP and bootp requests that are both un-answered in bridge mode. When I try to get an IP address on routed mode the dhcp client on my side works perfectly and I can get an IP in the 192.168.1.0/24 subnet. I checked I can also connect to the Internet although this is not my goal and what was agreed when I signed my contract with Sunrise.

So resume is that my DHCP client works correctly (in routed mode) but when in bridge mode the bridge (Sunrise cable modem) is not relaying my DHCP/bootp request.

regards,

Ioannis

Daniele_Sunrise

ioannisKK I’m not that technically experienced, but the Sunrise modem does not have an active DHCP server in bridge mode. Your router will take care of this.

I recommend that you use a different LAN connection on the Sunrise modem and connect it to your router WAN. I would then switch off your router and restart the Sunrise modem. As soon as it has restarted, switch on your router and see if it obtains the public IP.

If it still does not work, I recommend calling our support team on 0800 707 707 for a more in-depth analysis.

Greetings
Daniele