Hi @MarcoSch 

Thanks for posting in our business forum.

Please use English if we need to further discuss this issue.

Based on the title, and the screenshot, it is clear that the DHCP server fails to renew it.

How Does DHCP Work? Common Questions and Solutions

Hi @MarcoSch 

Thanks for posting in our business forum.

MarcoSch wrote

Hey @Clive_A,

 

Thanks for Your response. Now in english.

 

Hello,

after updating the firmware from version 1.3.0 to 1.4.x, the router requests a new IP address from the ISP every 2 hours (Internet connection dynamic IP).

The Internet connection is also cut hard here and so I have an outage of approx. 20 seconds every 2 hours.

I have also contacted the ISP about this. They have not made any changes. 

After I switched back to version 1.3.0, everything is running smoothly again.

The ISP also pointed out that they already had the same problem with LANCOM after a firmware update. LANCOM then improved the firmware and everything worked again. 

Are any new broadcast messages sent to the ISP with version 1.4.x and is the IP then retrieved again based on the response?

Thank you

marco

Who is your ISP?

The 20 seconds downtime means the connection is down DHCP renewal failed and requested a new IP.

Can you Wireshark on your WAN? Take a snip and show the interaction which might be helpful for me to diagnose the issue.

Please mosaic your sensitive information. Here is a list of information considered sensitive:

1. Public IP address on your WAN if your WAN is.

2. Real MAC address of your device.

3. Your personal information including address, domain name, and credentials.

For troubleshooting purposes, when a WAN IP is needed, please leave some values visible for identification.

Hi @MarcoSch 

Thanks for posting in our business forum.

MarcoSch wrote

Hey  @Clive_A,

 

my isp is named suec dacor in coburg / germany. I think it is a sub Company from vodafone. It is how you said. The connection is down while the ip renewal. There must be a difference between Version 1.3.0 and 1.4.x cause when i get back to 1.3.0 all is fine. I can wireshark but i it will be possible next week cause i am out of Office this week. Thank you, marco

Will check this with the test team and see if there are any known cases like this.

Hi  @MarcoSch 

MarcoSch wrote

Hey  @Clive_A,

 

my isp is named suec dacor in coburg / germany. I think it is a sub Company from vodafone. It is how you said. The connection is down while the ip renewal. There must be a difference between Version 1.3.0 and 1.4.x cause when i get back to 1.3.0 all is fine. I can wireshark but i it will be possible next week cause i am out of Office this week. Thank you, marco

We checked with the team.

Unfortunately, we do not have any progress on cases like this. We cannot locate the cause of this issue until we have a Wireshark result to show the process of renewal failure.

Please capture this failure process on your WAN and contact us when you are back.

Hi @MarcoSch 

Thanks for posting in our business forum.

MarcoSch wrote

Hey @Clive_A,

today i was able to wireshark the port.

I load the firmware 1.4.2 im my router er7206 v1. after two hours you can see in the wireshark log, that there are two offers and acks. there is another ack with an icmp errer "port unreachable" before. But i don't know, if this one matters.

Here is the screenshot from the log in the omada software and the wireshark capture.

In the capture file i was filtering for udp==68 (dhcp). if you need more information, i also had the full log from 16:27 to 16:40.

Thanks a lot for checking this.

 

Will look into this. Thanks for your time.