Internet connection problems with eircom efibre fixed 6

eircom eFibre internet connection problems

Eircom’s eFibre product is their fastest home broadband offering, promising speeds of up to 100mb. The connection speeds are generally quite good, being capable of handling TV, Netflix and a handful of other connected devices all at once without any real issue on the speed. However the one black mark against the service would be the intermittent issues with the eircom DNS servers. This can often cause internet connection problems, where the net connection shows as active but nothing loads. Frustrating!

What’s causing the internet connection problems?

Internet connection problems have a wide variety of possible causes (bad line, network down, device problems etc), but I’ve found the most common by a long shot to be a problem with the eircom DNS servers. DNS servers are the machines that translates a request for a human-readable domain like in to the IP address so that your machine knows how to connect to the right server. When these servers aren’t working correctly, it means that this translation never happens, so the computers on your network don’t know where to go. The connection is technically active, and some apps like Skype may still work, but anything relying on this DNS server will likely time out and fail.

Fortunately it’s relatively simple to fix, without much technical know-how required. Google provide DNS servers that have a much lower rate of failure than eircom’s own ones. Changing the eFibre router to use the Google DNS servers means that the failing eircom ones are taken out of the loop, and the internet is accessible once more.

Updating the eFibre router to use Google DNS

Eircom use the Zyxel F1000 router for their eFibre offering. It has a web-accessible control panel through which the DNS can be updated. So, from a device on your network, type in to your web browser’s address bar. You should then see a page like the below. If you get a ‘page not found’ error, try instead.

Zyxel F1000 admin

To log in to this admin panel, you’ll need the security key from your router. This is the code printed on the back, unless you’ve changed it at some point. If the code hasn’t been changed, the next two screens will prompt you to update it to a new code. It’s advisable to change from the default code, but if you don’t want to do it at this point, you can keep hitting “Skip” until you get to the router dashboard.

Network settingsOnce the dashboard loads, there should be a series of icons at the bottom of the screen – “Connection Status”, “Network Settings”, “Security”, “System Monitor” and “Maintenance”. To get to the DNS settings, first click the “Network Settings” icon. This will open a menu above it – select “Home Networking” from this list.

On the next screen, scroll down until you see the “DNS Values” heading. Click the circle to the left of “Static”. In the first box, enter and in the second, These are the addresses of the Google DNS servers. Click the “Apply” button in the bottom right of the screen to finish the change.

DNS settings

Once this has been done the router should then be using Google’s DNS servers, and normal internet service should be resumed!

Update 30/11: As pointed out by highnellybike on twitter, the root of the connection issues may be more to do with the way the in-built DNS proxy on this modem works than with the DNS servers themselves. In which case the same instructions as above can be used in order to set a static dDNSns server, but instead of the Google DNS servers, the eircom ones of and may be used.

6 thoughts on “Internet connection problems with eircom efibre fixed

  1. Reply Ken Dec 30,2014 12:01 pm

    Hi there

    Nice post. I have this same issue for some weeks now. My router passing IP traffic but dns name resolution doesn’t work. It appears to happen in the evening/night time so far.

    Also, when the problem exists, Eircom cannot access my router but I am not sure if name resolution is required as part of this process (Maybe router is not registering correctly if dns is required)

    For now, I have used the Eircom static dns settings and will see how it goes.


  2. Reply Seamus Jan 27,2015 9:28 am

    After being driven demented by Eircom support for the past week (one agent sent me the maintenance manual for the F1000 and effectively asked me to figure it out!) and ripping out every Ethernet cable in the house it is great to get some useful information for a change. Thank you.

    A couple of other points on Eircom propaganda;
    “Unlimited” apparently does not apply to line speed. It only applies to upload/download quantities. I got to learn this after trying to understand why my line was capped at 12Mb’s.

    I will never be able to get 100Mb’s as I am circa one kilometre from my nearest Eircom cabinet. That’s a hell of a drop in speed over 1000 metres (Irish Water doesn’t leak that much!).

    I live 20 miles from Dublin city centre. What chance does the rest of the country have of getting a decent broadband service in line with the rest of Europe. The network and infrastructure are a joke.

    Thanks again,

  3. Reply jp Jan 27,2015 10:02 pm

    A great article. I had the same issue.
    Rebooting the router 2 to 3 times every night. Changed the dns to static and to the Google dns and boom up and running. Fingers crossed it stays that way but so far so good. Well done saved me hours of Web surfing to try and find a solution.

  4. Reply Kieran Dundon Aug 12,2015 11:09 am

    Same problem for me. Just got an F2000 modem with my efibre and have this exact problem. Changed my DNS to Google and the problem still exists.
    The router sits with 97-98% memory used all the time. I get random failures where the domain is “not reachable” it’s pretty bad.
    Eircom are sending me a new router but I’m not hopeful, actually asked them if they could get me the old F1000 as that may not have the same issues.

  5. Reply Kris Harwas Oct 4,2015 11:27 am

    SAme the same issue as Kieran Dundon but I have F1000 modem and F1000 modems are nothing but crap.I changed the DNS server long time ago, and it worked for some time ok. For few weeks now the connection drops now and then and the whole internet seems to be a piece of shite. Wanted to check the DNS settings but now I can’t even access the modem settings. Before that – when I still was able to access the settings – sometimes I did see the CPU usage as high as 99%; rebooted the modem and it was back to 30%. Now, for last few days I can’t even access my router settings anymore; it does not want to load; sometimes it loads 1/10 of the page but most of the time it loads nothing, and often complains “TypeError: $.zyMask is not a function”. I am tired of that piece of crap…

  6. Reply David Feb 1,2018 4:15 pm

    THANK YOU!!! This problem has been driving me crazy on a new pc I bought so had to use my old one for months instead until I found this. Used the eircom dns didn’t try Google.


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