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Forum Discussion
Can I see lease info on RBR850?
I was wondering if there is a way I can see the lease info (length, expiration) of my RBR850 router for the IP addresses it receives from my ISP (not my devices on the network)? I would assume leases...
donawalt wrote:
I was wondering if there is a way I can see the lease info (length, expiration) of my RBR850 router for the IP addresses it receives from my ISP (not my devices on the network)? I would assume leases are different IPv4 vs. IPv6, so interested in both. Is that possible? Thanks!
There is always a (slim) chance that the ISP tech support line would disclose the information.
In my own case, Spectrum provides:
- IPv4 lease of one day (86,400 seconds)
- IPv6 lease of one week (604,800 seconds)
This was verified by tapping the modem-router Ethernet link and capturing the actual DHCP packets between my router and Spectrum modem using Wireshark. (A capture filter of port 67 or port 68 or port 546 or port 547 will ignore everything but the actual DHCP exchange.)
My guess is that DHCP leases will vary from ISP to ISP, and even from time-to-time for the same ISP. In my previous job, when we were about to make a change in our IP address scheme - such as when opening a new building - we would temporarily lower the DHCP lease to a very short value so that when we made the cutover, all devices would get new IPs during the night and the network would be stable by the time people arrived for work the next day. Then, we would set the DHCP lease back to one day.)
I want to see the lease info real time, as I am interested in seeing when I lose my IPv6 connection with what appears to be a valid IP address reported on the Orbi router page, if that corresponds to when the lease expired. So calling won't help that much, but thanks for the idea!
Thanks for looking at the debug page. The only way to see 'real time' information about DHCP would be to monitor the actual ISP packets, and for most people the results probably would not be worth the effort.
CrimpOn sure. I was hoping there was something similar to seeing the DHCP info from a Windows pc when you do "Ipconfig /all", where you get lease obtained and expires time stamps.
donawalt wrote:
CrimpOn sure. I was hoping there was something similar to seeing the DHCP info from a Windows pc when you do "Ipconfig /all", where you get lease obtained and expires time stamps.
I agree. That would be useful information. I have a suspicion that Netgear does not record the IPv6 lease information. I just now dumped the configuration file on my RBR50. There are a lot of parameters labelled "ipv6..." but there is nothing resembling a lease time (while the IPv4 lease information is obviously there).