After internet outage, router assigned again ip but no internet connection

[alexcomputerhelp]

Newbie alert. Not a network expert but need help. I have the current Merlin installed on the Asus AC56U router.

This year had fiber internet installed from Century Link. They have network issues often and the ac56u router loses its IP address. The service comes back, and the router gets an IP address again. There is no network activity though I can't access the internet through the router. I plugged the network cable directly into any computer in the home instead and I can access the internet. I reset the asus router and reflashed firmware. Used stock settings and tried different settings but I cannot access the internet from the router.Before the outage the router had been great.

Century Link has an ethernet cable coming from outside the house and a battery backup plugged into my wall. No modem I can see to reset. The customer support is not helpful and a tech takes days to come out. what is going wrong in my network? Thanks.

 

[kfp]

Is this IPv6?

 

[alexcomputerhelp]

Is this IPv6?

No it is ipv4. I am sorry I did not mention that. Any computer my laptop my desktop I can plug the ethernet cable from the cable company box into each computer directly and I have internet access. But not the ac56u router no internet access. Flashed firmare again. Tried the reset all settings option in the Merlin GUI. No internet access from the router but it is assigned an IP 4 address. I changed my router IP to check no conflict in ip addresses also.

 

[kfp]

Any computer my laptop my desktop I can plug the ethernet cable from the cable company box into each computer directly and I have internet access.

When you do this, what IPs are you getting for your devices?

 

[martinr]

It might be useful if you’d go to the Network Tools tab and see what happens when you press the Diagnose button so that you attempt to ping Google.

 

[alexcomputerhelp]

When you do this, what IPs are you getting for your devices?

The ip address my router always receives.

 

[alexcomputerhelp]

It might be useful if you’d go to the Network Tools tab and see what happens when you press the Diagnose button so that you attempt to ping Google.

The router can ping it.

 

[ColinTaylor]

So the router itself appears to have connectivity to the internet.

How are you connecting your PC to the router, wired or wireless? Try a wired connection if you haven't already.

 

[kfp]

The ip address my router always receives.

That doesn’t sound right. You should get a different IP if you’ve bypassed your router.

All devices you’ve connected directly (bypassing router) gets the same IP?

 

[ColinTaylor]

That doesn’t sound right. You should get a different IP if you’ve bypassed your router.

All devices you’ve connected directly (bypassing router) gets the same IP?

Remember that he's not connecting to a cable modem. So it's probably some kind of ISP switch port.

 

[kfp]

Remember that he's not connecting to a cable modem. So it's probably some kind of ISP switch port.

That’s exactly why I asked, especially when it’s IPv4 on a fibre service, ISPs sometimes don’t have enough public IPs for you so they have to NAT you. And in those cases if you double NAT you get poor performance.

I’m just trying to get information on whether the IPs OP is getting are public ones. I don’t see how not connecting to a cable modem has anything to do with how IPs are assigned.

 

[ColinTaylor]

I don’t see how not connecting to a cable modem has anything to do with how IPs are assigned.

Cable modems (which are probably the most common type of ISP-supplied device) typically hand out different IP addresses based on the client's MAC address. When you said "You should get a different IP if you’ve bypassed your router" I thought you were assuming he was using a cable modem. My mistake.

As he stated that the only piece of equipment he has from his ISP is the end of an Ethernet cable I don't find it particularly surprising that he always gets the same IP address irrespective of the device connected to the Ethernet cable.

Public IP or private, double NAT or not, neither of these things should result in a complete inability to connect to the internet.

 

[martinr]

The router can ping it.

To rule out DNS as the problem, what are your WAN DNS settings on the WAN page: Connect to DNS server automatically Yes/No; DNS Seever 1; and DNS Server 2?

Perhaps you could temporarily change them to: No (Connect to DNS server automatically) and 1.1.1.1 for Server 1, and 1.0.0.1 for Server 2 (and then hit Apply)

If that does NOT help then at least you’ve ruled out a DNS problem.

(You’ve nothing in the DNS server settings on the LAN DHCP page? And anything in the DNS Filtering section under AIProtection > Network Protection > DNS Filtering?)


Edit: In my original, I missed out NOT in “If that does NOT help... “. Sorry.

 

[kfp]

Public IP or private, double NAT or not, neither of these things should result in a complete inability to connect to the internet.

I know it shouldn’t, but some ISPs are just weird. I know some mobile operators look at TTL to prevent you from sharing an unlimited data plan for example. The ISP I have in mined in particular just don’t want people using their own routers it seems. Search for double NAT.

 

[alexcomputerhelp]

So the router itself appears to have connectivity to the internet.

How are you connecting your PC to the router, wired or wireless? Try a wired connection if you haven't already.

Everything is wired not wireless. And a basic setup. The same as before the outage and it had been fine then. I am lost.

 

[alexcomputerhelp]

To rule out DNS as the problem, what are your WAN DNS settings on the WAN page: Connect to DNS server automatically Yes/No; DNS Seever 1; and DNS Server 2?

Perhaps you could temporarily change them to: No (Connect to DNS server automatically) and 1.1.1.1 for Server 1, and 1.0.0.1 for Server 2 (and then hit Apply)

If that does NOT help then at least you’ve ruled out a DNS problem.

(You’ve nothing in the DNS server settings on the LAN DHCP page? And anything in the DNS Filtering section under AIProtection > Network Protection > DNS Filtering?)


Edit: In my original, I missed out NOT in “If that does NOT help... “. Sorry.

1.1.1.1 and 1.0.0.1 are my current settings that had been fine before the outage and I also tried letting the isp fill them in. I have no protections enabled or AIprotection.

 

[alexcomputerhelp]

That doesn’t sound right. You should get a different IP if you’ve bypassed your router.

All devices you’ve connected directly (bypassing router) gets the same IP?

My laptop, desktop, and router once plugged into the ethernet cable from outside my house all grab a similar if not the same IP address. the public ip address.

 

[alexcomputerhelp]

That’s exactly why I asked, especially when it’s IPv4 on a fibre service, ISPs sometimes don’t have enough public IPs for you so they have to NAT you. And in those cases if you double NAT you get poor performance.

I’m just trying to get information on whether the IPs OP is getting are public ones. I don’t see how not connecting to a cable modem has anything to do with how IPs are assigned.

NAT is disabled on the merlin settings.

 

[ColinTaylor]

NAT is disabled on the merlin settings.

Don't disable NAT if your router is connected directly to the internet (i.e. it has a public IP address).

 

[alexcomputerhelp]

Don't disable NAT if your router is connected directly to the internet (i.e. it has a public IP address).

I did because they mentioned double nat-ing