DNS and default gateway change with no internet

[Anony2565]

I have a problem with my router where the default gateway and DNS server is different than before. I get no Internet now and it only works when I reset it or manually set dns server on each device to 8.8.8.8

Default gateway is 172.16.11.82

And DNS servers are 87.237.17.169 and 87.237.17.201

I am not tech savy so would need a dumbed down explanation.

Thanks

[Anony2565]

But I don't. I try to connect to a site on and it hangs for ages and says connection timed out. This is on my laptop. When I try on my phone and I disconnect for mobile data and connect to broadband it says connected without internet. It also hangs and connection times out when I try to use it.

I tried resetting it multiple times and it doesn't work.

[Mustrum]

The default gateway does not seem right, is it normal for that router or has the internal ip range been altered?

[Anony2565]

Yeah the default gateway seems fishy to me as well it used to be something like 192.168 but now it's just that.

[XRaySpeX]

The Default Gateway IP looks correct. Mine is 172.16.14.26. They are called "Private IP Address Lan".

The 192.168.x.y IPs are addys within your own LAN. The Default Gateway is the 1st node outside which your router is connecting to. It is a private IP within the BT network & serves as the access point to the rest of the Net.

[Anony2565]

I don't know why but when I changed the Internet from dhcp to static on my phone the DNS was 192.168.1.254 which is my broadband ip but I changed it to 8.8.8.8 and the  I got Internet. 

I don't want to have to set dns on all my devices l. It seems it can only work on static

[Anony2565]

Just adding that I don't have a LAN network.

[XRaySpeX]

If you have a router you do have a LAN. You can see it under Advanced Settings / My Network.

[Anony2565]

It seems to work when I independently set a devices default gateway to the broadband ip

192.168.1.254

[Fortinbras_]

I have been having exactly the same problem with my Brightbox. Every mobile device in the house suddenly failed to connect to the internet. I discovered that, on each device, the DNS/Router address had switched to an incorrect one. The only way to get them back online was to reset each manually so that they pointed to the correct address. A day later I tested switching them back to auto, but they defaulted to the wrong IPv4 address again, losing their internet connection. I strongly suspect there is a problem with these routers. EE please take note. 

[mikeliuk]

Hi @Fortinbras_ ,

Did you make a note of the wrong IPv4 address they had switched to and were they consistent across all the misconfigured devices?

It sounds a lot like you have two DHCP servers running in your network and it would probably be good to isolate the root cause to ensure the security and integrity of your home network.

One simple explanation may be if you have connected any other network equipment recently such as an old router or network devices which plug into the wall with WiFi functionality. If you have a Linux device, it may be possible to investigate the rogue IPv4 address with nmap and nmap scripts to locate rogue DHCP servers.