DNS not being populated in resolv.conf

[Tom H]

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".

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.

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