DNS not being populated in resolv.conf

[Tom H]

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?

Please post "cat /etc/resolv.conf" after you connect to your office network.