Negative lease time on router for internal IP address

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afe66

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#240622 17-Sep-2018 13:45

I've got the usual Vodafone router fibre and a single dumb switch.

Yesterday the Netflix on A1 Sony fell over. Queue ridiculous amounts of wailing from small people. No wired LAN connection. Soft on/off not change anything.

So connected to router and the TV on 192.168.1.5 has lease time of negative 1820 hrs plus some negative minutes and seconds. All the other devices have positive lease times.

So I deleted the connection, removed and plugged Ethernet on TV and LAN reconnects and everything is good.

In hindsight this is the second time this has happened.

Any idea what's going on and how to stop it happening again?

Once the TV is on the wall, unplugging Ethernet from back will be a little tricky!!

PolicyGuy

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#2091965 17-Sep-2018 14:14

No idea what your problem is, but the unplugging is easy: do it at the other end, i.e. at your switch or patch panel.

You have labelled all the ports, outlets etc.? ;-)

RunningMan

8953 posts

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#2092019 17-Sep-2018 15:40

Which usual Vodafone router do you have? HG659 has a DHCP device limit - may have hit that?

muppet

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#2092020 17-Sep-2018 15:42

I would read that as it's way of saying "The lease expired this long ago"

Why did the lease expire? Probably DHCP client on the TV died for reasons unkown.

afe66

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#2092053 17-Sep-2018 16:52

The lease probably died within the previous 20 hrs. In that it was OK the night before but not working at 4pm when tried to use TV Netflix.

All my ports are labelled on switch so yes I can just pull that cable. But it's in another room in a cupboard behind the fishing gear in a scary corner with the odd spider and...

It's not a big deal but I was curious as to whether gz could givee answer.

Will check how many devices are connected in total next time it falls over. (yes h659).

Aredwood

3885 posts

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#2093538 20-Sep-2018 00:21

Android TV ?

Some earlier Android versions have buggy DHCP clients. Things like failing to renew their leases, or if they get assigned a new IP, will randomly revert to using an old IP again. Therefore IP conflicts and incorrect ARP tables in the router and any switches.

Workaround is to set static IP on the TV, Or set a DHCP reservation on the router.

Safest is probably to restart the TV, see what IP it grabs, and set a reservation of that IP in the router.

afe66

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#2093700 20-Sep-2018 11:13

It's running Android 7 with last security update August this year. There's an option to set up static address which would be easy enough. I haven't done this before as I tended to usestatic addresses for devices I regularly dial into such as the printer, nas, monitorless raspberry pi.

Thanks for you impressions.