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DHCP Relay is broken in ER8411(UN)_V1_1.3.6 Build 20251028 firmware when we shutdown the device

DHCP Relay is broken in ER8411(UN)_V1_1.3.6 Build 20251028 firmware when we shutdown the device

DHCP Relay is broken in ER8411(UN)_V1_1.3.6 Build 20251028 firmware when we shutdown the device
DHCP Relay is broken in ER8411(UN)_V1_1.3.6 Build 20251028 firmware when we shutdown the device
2 weeks ago - last edited 2 weeks ago
Tags: #DHCP Service
Model: ER8411  
Hardware Version: V1
Firmware Version: ER8411(UN)_V1_1.3.6 Build 20251028

DHCP Relay is broken in ER8411(UN)_V1_1.3.6 Build 20251028 when we shutdown the device

 

Model: ER8411  

Hardware Version: V1

Firmware Version: ER8411(UN)_V1_1.3.6 Build 20251028

The DHCP Relay functionality is broken in the ER8411(UN)_V1_1.3.6 Build 20251028  firmware. The router forwards DHCP datagrams from configured VLANS to the DHCP server, but it does not forward DHCP replies to the client(s).

 

topology:

 

 

P.S.

The router managed in the standalone mode.

 

Tests performed next:
Relay reconfiguration = done. Test: relay functional.
Router reboot via the web interface = done. Test = relay no longer works.
Disabling and then re-enabling the relay = no effect.
Changing the relay address to a new secondary DHCP server => DHCP relay works again.
After 3 minutes, switching back to the primary DHCP server relay = relay works.

We repeated the tests several times and were able to simulate the failure.

In summary:
As soon as there is a reboot (manual or due to a power outage), the relay stops working. To make it work, you need to modify the DHCP configuration on the LAN interface. Either by modifying the DHCP relay or enabling the DHCP server. Then re-configure the router (wait 2-3 minutes between each modification).

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#1
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4 Reply
Re:DHCP Relay is broken in ER8411(UN)_V1_1.3.6 Build 20251028 firmware when we shutdown the device
a week ago

  @yves.remy 

 

Any update ?

 

do you have a solution about this topic ?

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#2
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Re:DHCP Relay is broken in ER8411(UN)_V1_1.3.6 Build 20251028 firmware when we shutdown the device
Wednesday

  @yves.remy 

Hello, any update?

Regards,

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#3
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Re:DHCP Relay is broken in ER8411(UN)_V1_1.3.6 Build 20251028 firmware when we shutdown the device
Yesterday

  @LilianG 

Hi,

you asked me if i have new but don't have a replyed from your part??

 

do take the time to test or reproduce the The issue, ??

 

best regards,

 

yves

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#4
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Re:DHCP Relay is broken in ER8411(UN)_V1_1.3.6 Build 20251028 firmware when we shutdown the device
20 hours ago

  @yves.remy 

Hello,

 

It's me who reported that we have identified the issue.

 

We have 6 ER8411 who was in version 1.2.3 without any issue.

All router have the IP public configure on the wan port, a local LAN without vlan and a IpSec configured.

A dhcp relay is configure on the LAN. The DHCP server is accessible remotly via the IpSec.

 

After the upgrade to 1.3.6 on all router the relay dhcp stop fonctionning after a hard or soft reboot.
To resolve the issue, we have to modify the ip of the relay dhcp to a temporary address then after 2min , configure the real ip address of our DHCP server.

Regards,

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#5
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Views: 175

Replies: 4

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