DHCP lease frozen

Steelstar · Post by **Steelstar** » Mon Feb 16, 2015 11:32 pm

Hi, I have noticed that a couple of addresses in the DHCP lease list have a frozen time (2h 43min 29 secs). Even if I restart the router this won't change. Is there a way to reset the DHCP leased table?
Everything is working fine... just I find this weird.

Post by **billion_fan** » Tue Feb 17, 2015 9:18 am

Steelstar wrote:Hi, I have noticed that a couple of addresses in the DHCP lease list have a frozen time (2h 43min 29 secs). Even if I restart the router this won't change. Is there a way to reset the DHCP leased table?
Everything is working fine... just I find this weird.

Have you tried to adjust the 'Leased Time (hour)' for the DHCP time??

phreder · Post by **phreder** » Tue Feb 17, 2015 4:45 pm

This has happened to me in the past and I've also seen it mentioned elsewhere on the forum. I can't remember the circumstances that triggered it and don't really want to experiment. I'm sure it's a bug, the time I've seen myself & quoted is always 2h 43min 29secs. Seems to be a 'magic' number though even converting it to seconds doesn't look significant.

dmpfran · Post by **dmpfran** » Tue Feb 17, 2015 5:42 pm

I have such an entry in my DHCP table

billion1.png

The mac 08:eb:74:7c:6e:14 entry is a device which broke and was replaced with the mac 08:eb:74:a0:0f:47 device.

Hope that the above helps

Post by **billion_fan** » Wed Feb 18, 2015 10:07 am

dmpfran wrote:I have such an entry in my DHCP table
billion1.png
The mac 08:eb:74:7c:6e:14 entry is a device which broke and was replaced with the mac 08:eb:74:a0:0f:47 device.

Hope that the above helps

Does anyone know how to replicate the issue, I just checked my DHCP table and everything is normal (I haven't seen or experienced this issue before)

Normally when the device is disconnected from the router, the DHCP time will revert to 0 seconds, I assume you have tried restarting the device (eg PC) that has this funny DHCP time.

Its also strange that a reboot of the router does not resolve the issue, as a new DHCP lease should be obtained (once turned off the router should clear the DHCP table NAT sessions etc)

Steelstar · Post by **Steelstar** » Wed Feb 18, 2015 1:42 pm

I have even tried to reflash the firmware and upload the configuration but the problem is back.
My LAN configuration has 3 separate groups (but I don't think this matters).
In the main Group I have 3 devices with a fixed IP (192.168.1.2-3-4) while the rest is DHCP 192.168.1.100-199.
One thing to notice is that I changed time of DHCP lease a couple of times (from 24 to 240). Maybe this is where the problem comes from? But even if I set back a 24 value some devices remain frozen.

Steelstar · Post by **Steelstar** » Wed Feb 18, 2015 1:45 pm

Look how it appears now...

Post by **billion_fan** » Wed Feb 18, 2015 2:46 pm

Steelstar wrote:Look how it appears now...

What firmware version are you on??

Have you tried the dm12 firmware, also don't restore your config if you currently have issues with it (there might be something corrupt)

Steelstar · Post by **Steelstar** » Wed Feb 18, 2015 4:48 pm

I have 2.32d.dh2. I didn't know there was a dm12 firmware too...
What are the differences?

Post by **billion_fan** » Wed Feb 18, 2015 5:25 pm

Steelstar wrote:I have 2.32d.dh2. I didn't know there was a dm12 firmware too...
What are the differences?

dm12 is newer and has the IPsec passthrough fix, (you can find the firmware on the VPN pasthrough thread)

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