DNS not being populated in resolv.conf

[Kaushal Shriyan]

On Sun, Nov 28, 2010 at 4:55 PM, Tom H <tomh0665 at gmail.com> wrote:

> On Sun, Nov 28, 2010 at 1:34 AM, Kaushal Shriyan
> <kaushalshriyan at gmail.com> wrote:
> > On Sat, Nov 27, 2010 at 1:21 PM, Tom H <tomh0665 at gmail.com> wrote:
> >> On Fri, Nov 26, 2010 at 9:08 PM, Kaushal Shriyan
> >> <kaushalshriyan at gmail.com> wrote:
> >> >
> >> > I have three Internet Service Provider to connect to internet from my
> >> > laptop
> >> > running Ubuntu Desktop Linux OS 10.04
> >> > For example ISP A, ISP B ISP C
> >> > ISP A  --> is the Office Network (when i am in office )
> >> > ISP B -->  is the Mobile Broadband Network (when i am moving )
> >> > ISP C --> is the Home Network (when i am at home)
> >> > Also in addition to the above details :-
> >> > I have local DNS Server at office, DNS server of Data Center 1 and DNS
> >> > Server of Data Center 2. so whenever i am in office, by default i need
> >> > to
> >> > connect to these
> >> > three DNS Servers in order to access the servers.
> >> > The steps i have followed after using resolvconf
> >> > sudo apt-get install resolvconf
> >> > sudo rm /etc/resolv.conf
> >> > sudo ln -s /etc/resolvconf/run/resolv.conf /etc/resolv.conf
> >> > sudo vim /etc/openvpn/update-resolv-conf
> >> >
> >> > Add the following lines in the beginning.
> >> >
> >> > foreign_option_1='dhcp-option DOMAIN off.example.com dc1.example.com
> >> > dc2.example.com'
> >> > foreign_option_2='dhcp-option DNS 172.26.0.1'
> >> > foreign_option_3='dhcp-option DNS 10.20.0.1'
> >> > foreign_option_4='dhcp-option DNS 10.20.0.2'
> >> > foreign_option_5='dhcp-option DNS 10.30.0.1'
> >> > save and exit
> >> > Add the below two lines at the bottom of the file openvpn client
> >> > DC1.conf
> >> >
> >> > up /etc/openvpn/update-resolv-conf
> >> > down /etc/openvpn/update-resolv-conf
> >> > The issue which i am facing is that I am unable to resolve the local
> DNS
> >> > Servers at office. I need the local DNS Server in order to access
> >> > Network
> >> > printers
> >> > and other devices.
> >> > Office DNS Server is off.example.com and DNS Server IP is 172.26.0.1
> >>
> >> Are all five options above for your office network?
> >
> > Not sure i understand that ?
> >>
> >> Please post "cat /etc/resolv.conf" after you connect to your office
> >> network.
> >
> > cat /etc/resolv.conf in my Ubuntu Laptop Desktop PC running 10.04
> > search off.example.com  ### office
> > search dc1.example.com ### DataCenter No.1
> > search dc2.example.com' ### DataCenter No. 2
> > DNS 172.26.0.1
> > DNS 10.20.0.1
> > DNS 10.20.0.2
> > DNS 10.30.0.1
>
> This "resolv.conf" is incorrect.
>
> The "DNS" lines don't mean anything. It shouldn't be "DNS" but
> "nameserver".
>
>
Hi Tom,

sorry there was a typo, it is actually nameserver


The "search" lines don't make sense (although I could be wrong). I
> don't use "search" but I'd expect your "resolv.conf" to have one
> search line "search example.com" with your domain and not three with
> boxes.
>
>
search off.example.com  ### office
search dc1.example.com ### DataCenter No.1
search dc2.example.com' ### DataCenter No. 2
nameserver 172.26.0.1
nameserver 10.20.0.1
nameserver 10.20.0.2
nameserver 10.30.0.1

Are you saying it should be as below  :-

foreign_option_1='dhcp-option DOMAIN off.example.com' ### office
foreign_option_2='dhcp-option DOMAIN dc1.example.com' ### DataCenter No.1
foreign_option_3='dhcp-option DOMAIN dc2.example.com' ### DataCenter No.2
foreign_option_4='dhcp-option DNS 172.26.0.1' ### office
foreign_option_5='dhcp-option DNS 10.20.0.1'  ### DataCenter No.1
foreign_option_6='dhcp-option DNS 10.20.0.2'  ### DataCenter No.1
foreign_option_7='dhcp-option DNS 10.30.0.1'  ### DataCenter No.2


> (I'd asked whether the five "foreign_option_X" were for your three
> locations or just for your office.)


foreign_option_X was for the three locations viz office,data center 1 and
data center 2

Please suggest/guide further

Thanks

Kaushal
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