DHCP server allocating IP address before the lease expires

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DHCP server allocating IP address before the lease expires

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
DHCP server allocating IP address before the lease expires
DHCP server allocating IP address before the lease expires
2023-04-26 11:03:22
Model: ER605 (TL-R605)  
Hardware Version: V2
Firmware Version:

I see many DHCP server IP address allocations sometimes minutes apart for the same device. I have set the lease period to be 48 hours, but reallocations keep happening way earlier. Some times I see internet access interruptions but I am not able to pin point it to load balancer or the ISP. This started happening after I upgraded to 605 from 470. So my suspicions are on 605 still. Any help to isolate and fix the problem will be appreciated. I have a deco mesh farm sitting behind the load balancer. I have configured 2 WANs and the rest as LANs

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#1
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4 Reply
Re:DHCP server allocating IP address before the lease expires
2023-04-26 11:04:48

  @Mohan61 

firmware version

2.1.2 Build 20230210 Rel.62992

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#2
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Re:DHCP server allocating IP address before the lease expires
2023-04-27 06:32:17

Hello @Mohan61 ,

 

Mohan61 wrote

I see many DHCP server IP address allocations sometimes minutes apart for the same device. I have set the lease period to be 48 hours, but reallocations keep happening way earlier.

 

May I know exactly how earlier in advance before the DHCP lease expired?

How often did this issue happen and can you reproduce it stably?

 

May I know if there is a reboot behavior on the client devices or ER605 during the DHCP lease time?

Best Regards! >> Omada EAP Firmware Trial Available Here << >> Get the Latest Omada SDN Controller Releases Here << *Try filtering posts on each forum by Label of [Early Access]*
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#3
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Re:DHCP server allocating IP address before the lease expires
2023-04-27 06:43:20 - last edited 2023-04-27 06:44:21

  @Mohan61 

 

I am attaching a copy paste of my system log from er605
all allocations for the same deco mesh router. The router is physically close by connected with a short cat6 cable.

these allocations happen with other devices too.

 

1 2023-04-27 12:05:45 Remote Management NOTICE IP address 192.168.0.120 succeeded to access the server.
2 2023-04-27 10:58:33 DHCP Server NOTICE  
3 2023-04-27 09:44:01 DHCP Server NOTICE  
4 2023-04-27 09:30:33 DHCP Server NOTICE  
5 2023-04-27 09:30:27 DHCP Server NOTICE  
6 2023-04-27 09:13:27 Remote Management NOTICE  
7 2023-04-27 08:02:15 DHCP Server NOTICE  
8        
9 2023-04-27 06:24:58 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: xxxxxxxx:2c].
10 2023-04-27 06:23:57 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: xxxxxxxxx:2c].
11 2023-04-27 06:23:44 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: xxxxxxxxxx:2c].
12 2023-04-27 06:21:24 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: xxxxxxxxxx. 2c].
13 2023-04-27 06:11:38 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: xxxxxxxxxxxx2c].
14 2023-04-27 06:11:33 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: xxxxxxxxxxxxx2c].
15 2023-04-27 06:10:13 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: xxxxxxxxxxxxxxxx2c].
16 2023-04-27 06:09:58 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: xxxxxxxxxxxxxx2c].
17 2023-04-27 06:03:31 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: xxxxxxxxxxxxxx2c].
18 2023-04-27 06:03:17 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: xxxxxxxxxxxxxxx2c].
19 2023-04-27 06:00:48 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: cxxxxxxxxxxxxxx :2c].
20 2023-04-27 05:50:37 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: xxxxxxxxxxxxx:2c].
21 2023-04-27 05:50:23 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: xxxxxxxxxxxccc:2c].
22 2023-04-27 05:49:06 DHCP Server NOTICE DHCP Server allocated IP address 192.168.0.107 for the client[MAC: xxxxxxxxxxxxxx2c].
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#4
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Re:DHCP server allocating IP address before the lease expires
2023-04-27 06:46:31

  @Hank21 

it is not reproduceable consistently. It happens randomly. So far I have not been able to identify what sequence of events results in this

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#5
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