Virtualbox and DNS resolution

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I created a virtual NAT network with 3 VM turning with Ubuntu.



I have a VM with two virtual network cards to be a router which is connected to the WAN and the LAN.



I have two other VM in the LAN.



When I ping public ip like the ip of Google with any VM, it works.



But only the router can resolve dns.



I configured the dns server on the others VM as 8.8.8.8, and I restarted the network.



I can ping 8.8.8.8, and in the conf file all is alright but when I do "apt-get update" or I go to google.fr in Firefox , it doesn't works because I can't resolve any dns.



Any help?




ubuntu virtualbox dns nat




share|improve this question






















  • The systems that have problems do have /etc/resolv.conf with "nameserver 8.8.8.8" and they can ping 8.8.8.8? If so, is a firewall involved?
    – Gerard H. Pille
    Feb 26 at 15:55










  • On the iptables rules I allow POSTROUTING anywhere to anywhere for everybody, INPUT and OUTPUT have default config. Is the firewall able to allowing to ping the server but preventing dns resolution?
    – Nassim Quelconque
    Feb 28 at 11:01










  • That is possible, ICMP (ping) is not UDP is not TCP, iptables can handle each one diferently. Just to be sure: what error do you get with "nslookup www.google.be"? Concerning postrouting, you do nat too?
    – Gerard H. Pille
    Feb 28 at 11:49















up vote
0
down vote

favorite












I created a virtual NAT network with 3 VM turning with Ubuntu.



I have a VM with two virtual network cards to be a router which is connected to the WAN and the LAN.



I have two other VM in the LAN.



When I ping public ip like the ip of Google with any VM, it works.



But only the router can resolve dns.



I configured the dns server on the others VM as 8.8.8.8, and I restarted the network.



I can ping 8.8.8.8, and in the conf file all is alright but when I do "apt-get update" or I go to google.fr in Firefox , it doesn't works because I can't resolve any dns.



Any help?




ubuntu virtualbox dns nat




share|improve this question






















  • The systems that have problems do have /etc/resolv.conf with "nameserver 8.8.8.8" and they can ping 8.8.8.8? If so, is a firewall involved?
    – Gerard H. Pille
    Feb 26 at 15:55










  • On the iptables rules I allow POSTROUTING anywhere to anywhere for everybody, INPUT and OUTPUT have default config. Is the firewall able to allowing to ping the server but preventing dns resolution?
    – Nassim Quelconque
    Feb 28 at 11:01










  • That is possible, ICMP (ping) is not UDP is not TCP, iptables can handle each one diferently. Just to be sure: what error do you get with "nslookup www.google.be"? Concerning postrouting, you do nat too?
    – Gerard H. Pille
    Feb 28 at 11:49













up vote
0
down vote

favorite









up vote
0
down vote

favorite











I created a virtual NAT network with 3 VM turning with Ubuntu.



I have a VM with two virtual network cards to be a router which is connected to the WAN and the LAN.



I have two other VM in the LAN.



When I ping public ip like the ip of Google with any VM, it works.



But only the router can resolve dns.



I configured the dns server on the others VM as 8.8.8.8, and I restarted the network.



I can ping 8.8.8.8, and in the conf file all is alright but when I do "apt-get update" or I go to google.fr in Firefox , it doesn't works because I can't resolve any dns.



Any help?




ubuntu virtualbox dns nat




share|improve this question














I created a virtual NAT network with 3 VM turning with Ubuntu.



I have a VM with two virtual network cards to be a router which is connected to the WAN and the LAN.



I have two other VM in the LAN.



When I ping public ip like the ip of Google with any VM, it works.



But only the router can resolve dns.



I configured the dns server on the others VM as 8.8.8.8, and I restarted the network.



I can ping 8.8.8.8, and in the conf file all is alright but when I do "apt-get update" or I go to google.fr in Firefox , it doesn't works because I can't resolve any dns.



Any help?





ubuntu virtualbox dns nat





share|improve this question













share|improve this question




share|improve this question








edited Feb 26 at 12:13









Pierre.Vriens

94241015




94241015










asked Feb 26 at 11:31









Nassim Quelconque

1




1











  • The systems that have problems do have /etc/resolv.conf with "nameserver 8.8.8.8" and they can ping 8.8.8.8? If so, is a firewall involved?
    – Gerard H. Pille
    Feb 26 at 15:55










  • On the iptables rules I allow POSTROUTING anywhere to anywhere for everybody, INPUT and OUTPUT have default config. Is the firewall able to allowing to ping the server but preventing dns resolution?
    – Nassim Quelconque
    Feb 28 at 11:01










  • That is possible, ICMP (ping) is not UDP is not TCP, iptables can handle each one diferently. Just to be sure: what error do you get with "nslookup www.google.be"? Concerning postrouting, you do nat too?
    – Gerard H. Pille
    Feb 28 at 11:49

















  • The systems that have problems do have /etc/resolv.conf with "nameserver 8.8.8.8" and they can ping 8.8.8.8? If so, is a firewall involved?
    – Gerard H. Pille
    Feb 26 at 15:55










  • On the iptables rules I allow POSTROUTING anywhere to anywhere for everybody, INPUT and OUTPUT have default config. Is the firewall able to allowing to ping the server but preventing dns resolution?
    – Nassim Quelconque
    Feb 28 at 11:01










  • That is possible, ICMP (ping) is not UDP is not TCP, iptables can handle each one diferently. Just to be sure: what error do you get with "nslookup www.google.be"? Concerning postrouting, you do nat too?
    – Gerard H. Pille
    Feb 28 at 11:49
















The systems that have problems do have /etc/resolv.conf with "nameserver 8.8.8.8" and they can ping 8.8.8.8? If so, is a firewall involved?
– Gerard H. Pille
Feb 26 at 15:55




The systems that have problems do have /etc/resolv.conf with "nameserver 8.8.8.8" and they can ping 8.8.8.8? If so, is a firewall involved?
– Gerard H. Pille
Feb 26 at 15:55












On the iptables rules I allow POSTROUTING anywhere to anywhere for everybody, INPUT and OUTPUT have default config. Is the firewall able to allowing to ping the server but preventing dns resolution?
– Nassim Quelconque
Feb 28 at 11:01




On the iptables rules I allow POSTROUTING anywhere to anywhere for everybody, INPUT and OUTPUT have default config. Is the firewall able to allowing to ping the server but preventing dns resolution?
– Nassim Quelconque
Feb 28 at 11:01












That is possible, ICMP (ping) is not UDP is not TCP, iptables can handle each one diferently. Just to be sure: what error do you get with "nslookup www.google.be"? Concerning postrouting, you do nat too?
– Gerard H. Pille
Feb 28 at 11:49





That is possible, ICMP (ping) is not UDP is not TCP, iptables can handle each one diferently. Just to be sure: what error do you get with "nslookup www.google.be"? Concerning postrouting, you do nat too?
– Gerard H. Pille
Feb 28 at 11:49
















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