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Issues with Eircom DNS

  • 06-11-2010 4:24pm
    #1
    dabl
    Registered Users, Registered Users 2 Posts: 50 ✭✭


    I run Ubuntu 10.04 and I was having problems getting both Google Earth and Boxee to work. They were just not connecting to the internet. I came across OpenDNS one day and using that fixed the problem. Google's DNS works too. I am curious to know why Eircom's DNS would cause problems on Ubuntu because Google Earth worked for me before on Windows.


Comments

  • #2
    Naikon
    Closed Accounts Posts: 4,564 ✭✭✭Naikon


    dabl wrote: »
    I run Ubuntu 10.04 and I was having problems getting both Google Earth and Boxee to work. They were just not connecting to the internet. I came across OpenDNS one day and using that fixed the problem. Google's DNS works too. I am curious to know why Eircom's DNS would cause problems on Ubuntu because Google Earth worked for me before on Windows.

    Because eircom is ****. It's really that simple. To provide better performance, you could use dnsmasq instead of pointing /etc/resolv.conf directly to OpenDNS's servers. Basically, the local client, dnsmasq caches each request you make, so you save bandwidth and suffer less timeouts. Main thing is to change /etc/resolv.conf to point to your own dns server installed on the local machine(dnsmasq - 127.0.0.1 should be in /etc/resolv.conf). Here is a good tutorial. Sorry I haven't answered your question fully, but I hope dnsmasq improves things a bit:pac:

    http://www.g-loaded.eu/2010/09/18/caching-nameserver-using-dnsmasq/


  • #3
    AndrewMc
    Registered Users, Registered Users 2 Posts: 354 ✭✭AndrewMc


    It's possibly related to IPv6. As I understand it, Eircom's home routers don't understand AAAA queries. When they get one they throw it away like it never happened, and your Linux desktop sits there waiting for a reply that'll never come. When you specify DNS servers manually you're bypassing the router's resolver, and talking to one that actually works properly.

    I've seen this happen with my own Linux laptop, and only ever with Eircom routers. My guess is your Windows desktop didn't have IPv6 enabled so the problem wasn't highlighted.


  • #4
    dabl
    Registered Users, Registered Users 2 Posts: 50 ✭✭dabl


    I specified the Eircom DNSs manually in Network Manager and that fixes it so it must be the router. I know this is possibly a deep question, but can a fix be applied in the router? If not then I think plenty of people will be having broken internets as ipv6 starts to take over.


  • #5
    Mathiasb
    Registered Users, Registered Users 2 Posts: 425 ✭✭Mathiasb


    dabl wrote: »
    I specified the Eircom DNSs manually in Network Manager and that fixes it so it must be the router. I know this is possibly a deep question, but can a fix be applied in the router? If not then I think plenty of people will be having broken internets as ipv6 starts to take over.

    Only people on Eircom, and that's Eircom's problem ;)


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