<div class="gmail_quote">On Mon, Nov 29, 2010 at 1:16 PM, Tom H <<a href="mailto:tomh0665@gmail.com">tomh0665@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> On Sun, Nov 28, 2010 at 7:15 AM, Kaushal Shriyan <div><div></div><div class="h5"><<a href="mailto:kaushalshriyan@gmail.com">kaushalshriyan@gmail.com</a>> wrote: > On Sun, Nov 28, 2010 at 4:55 PM, Tom H <<a href="mailto:tomh0665@gmail.com">tomh0665@gmail.com</a>> wrote: >> On Sun, Nov 28, 2010 at 1:34 AM, Kaushal Shriyan >> <<a href="mailto:kaushalshriyan@gmail.com">kaushalshriyan@gmail.com</a>> wrote: >> > On Sat, Nov 27, 2010 at 1:21 PM, Tom H <<a href="mailto:tomh0665@gmail.com">tomh0665@gmail.com</a>> wrote: >> >> On Fri, Nov 26, 2010 at 9:08 PM, Kaushal Shriyan >> >> <<a href="mailto:kaushalshriyan@gmail.com">kaushalshriyan@gmail.com</a>> 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 <a href="http://off.example.com" target="_blank">off.example.com</a> <a href="http://dc1.example.com" target="_blank">dc1.example.com</a> >> >> > <a href="http://dc2.example.com" target="_blank">dc2.example.com</a>' >> >> > 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 <a href="http://off.example.com" target="_blank">off.example.com</a> 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 <a href="http://off.example.com" target="_blank">off.example.com</a> ### office >> > search <a href="http://dc1.example.com" target="_blank">dc1.example.com</a> ### DataCenter No.1 >> > search <a href="http://dc2.example.com" target="_blank">dc2.example.com</a>' ### 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". > </div></div><div class="im">> 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 <a href="http://example.com" target="_blank">example.com</a>" with your domain and not three with >> boxes. > > search <a href="http://off.example.com" target="_blank">off.example.com</a> ### office > search <a href="http://dc1.example.com" target="_blank">dc1.example.com</a> ### DataCenter No.1 > search <a href="http://dc2.example.com" target="_blank">dc2.example.com</a>' ### 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 <a href="http://off.example.com" target="_blank">off.example.com</a>' ### office > foreign_option_2='dhcp-option DOMAIN <a href="http://dc1.example.com" target="_blank">dc1.example.com</a>' ### DataCenter No.1 > foreign_option_3='dhcp-option DOMAIN <a href="http://dc2.example.com" target="_blank">dc2.example.com</a>' ### 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 </div>OK for "nameserver". No, I wasn't suggesting the you spread the "search" values over three lines. I was curious as to how the script that's putting your "resolv.conf" together could distinguish between your locations. Since you only have your office DNS settings, it's not relevant. I'm still not clear on "search <a href="http://off.example.com" target="_blank">off.example.com</a> <a href="http://dc1.example.com" target="_blank">dc1.example.com</a> <a href="http://dc2.example.com" target="_blank">dc2.example.com</a>". Are <a href="http://off.example.com" target="_blank">off.example.com</a>, <a href="http://dc1.example.com" target="_blank">dc1.example.com</a>, <a href="http://dc2.example.com" target="_blank">dc2.example.com</a> subdomains of <a href="http://example.com" target="_blank">example.com</a> or servers? For example, I'd assumed that "dcX..." referred to AD DCs. Is a host, whose short name is "box", in your office called "<a href="http://box.off.example.com" target="_blank">box.off.example.com</a>" or "<a href="http://box.example.com" target="_blank">box.example.com</a>"? Since your "resolv.conf" is correct, assuming that you've used the correct DNS server ip addresses, what happens when you run a DNS query? What's the output of grep hosts /etc/nsswitch.conf dig +trace office_server dig +trace +nosearch office_server <div><div></div><div class="h5"> -- ubuntu-users mailing list <a href="mailto:ubuntu-users@lists.ubuntu.com">ubuntu-users@lists.ubuntu.com</a> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-users" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-users</a> </div></div></blockquote></div> Hi Tom kaushal@kaushal-laptop:~$ grep hosts /etc/nsswitch.conf hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4 kaushal@kaushal-laptop:~$ dig +trace 172.26.0.1 ; <<>> DiG 9.7.0-P1 <<>> +trace 172.26.0.1 ;; global options: +cmd ;; connection timed out; no servers could be reached kaushal@kaushal-laptop:~$ dig +trace +nosearch 172.26.0.1 ; <<>> DiG 9.7.0-P1 <<>> +trace +nosearch 172.26.0.1 ;; global options: +cmd ;; connection timed out; no servers could be reached kaushal@kaushal-laptop:~$ping 172.26.0.1 PING 172.26.0.1 (172.26.0.1) 56(84) bytes of data. 64 bytes from <a href="http://172.26.0.1">172.26.0.1</a>: icmp_seq=1 ttl=64 time=2.96 ms 64 bytes from <a href="http://172.26.0.1">172.26.0.1</a>: icmp_seq=2 ttl=64 time=0.137 ms 64 bytes from <a href="http://172.26.0.1">172.26.0.1</a>: icmp_seq=3 ttl=64 time=0.142 ms ^C --- 172.26.0.1 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2000ms rtt min/avg/max/mdev = 0.137/1.081/2.966/1.332 ms kaushal@kaushal-laptop:~$netstat -r | grep -w default default 172.26.0.1 0.0.0.0 UG 0 0 0 eth0 kaushal@kaushal-laptop:~$host <a href="http://off.example.com">off.example.com</a> <a href="http://off.example.com">off.example.com</a> has address publicIP kaushal@kaushal-laptop:~$ I dont know why <a href="http://off.example.com">off.example.com</a> resolves to my External Outgoing Public IP and not Internal LAN Gateway IP. Please suggest/further. Thanks and Regards Kaushal