[SOLVED] xubuntu not connecting to internet after removing firewall

frank4360 · 08-08-2013, 12:33 PM

Hello

I have just set up a Wifi LAN using ssh to connect a xubuntu system to a LinuxLite netbook.

I use an Orange Livebox 2 as the ADSL router for internet connection.

I set up both machines and the router with static IP addresses, but I also activated the ufw firewall on both computers. ssh works fine to connect the two systems, but no internet connection (typically Firefox and Thunderbird).

So I thought that it was unnecessary to have a firewall at all and I disabled the firewall and "ufw status verbose" shows "inactive". Still no internet connection.

Is it possible that some files and settings might still be causing the problem?

Any ideas gratefully accepted

camorri · 08-08-2013, 01:35 PM

Have you got a default route set?

To find out, open a terminal, and run the command 'netstat -r' ( without the quotes ). You should see something like this:

Code:

netstat -r
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
default         cisco           0.0.0.0         UG        0 0          0 eth0
loopback        *               255.0.0.0       U         0 0          0 lo
192.168.1.0     *               255.255.255.0   U         0 0          0 eth0

You should see the 'default' line. If it is not there, you need to set it up to point to the routers IP address.

Can you ping the router?

frank4360 · 08-08-2013, 02:08 PM

Quote:

Originally Posted by camorri

Have you got a default route set?

To find out, open a terminal, and run the command 'netstat -r' ( without the quotes ). You should see something like this:

Code:

netstat -r
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
default         cisco           0.0.0.0         UG        0 0          0 eth0
loopback        *               255.0.0.0       U         0 0          0 lo
192.168.1.0     *               255.255.255.0   U         0 0          0 eth0

You should see the 'default' line. If it is not there, you need to set it up to point to the routers IP address.

Can you ping the router?

Yes,the default route is the same as your example, except the Gateway is "192.168.1.1" and the Iface is "wlan0".

Pinging the router is fine; also the router shows the connected systems, and ssh works fine between the two problem systems (provided the router is on and the Wifi is working).

michaelk · 08-08-2013, 02:41 PM

If you can ping 74.125.228.52 (google.com) and can access their website using the same IP i.e. http://74.125.228.52 then since your using static IPs the resolv.conf file may not contain any name servers.

frank4360 · 08-08-2013, 02:58 PM

Quote:

Originally Posted by michaelk

If you can ping 74.125.228.52 (google.com) and can access their website using the same IP i.e. http://74.125.228.52 then since your using static IPs the resolv.conf file may not contain any name servers.

Yes - the ping and the connect to the IP address for google both work; so you have the answer!

But what can I do to add "name servers" to the resolv.conf file? By the way, on xubuntu /etc/resolvconf/resolv.conf.d contains two files, "base" and "head".

camorri · 08-08-2013, 03:14 PM

Edit the file /etc/resolv.conf and add the nameservers IP addresses. The entries will look like this:

Quote:

cat /etc/resolv.conf
nameserver 208.67.222.222
nameserver 208.67.220.220
nameserver 8.8.8.8
nameserver 8.8.4.4

You need to change the IP addresses to the IP addresses supplied by your ISP. The first two I listed are for my ISP. The next two are google name servers. If you do not know the IP's for your ISP, then try the last two. They should work, but may not be as fast as your ISP's name servers. Let us know.

michaelk · 08-08-2013, 03:25 PM

base syntax is:
nameserver xxx.xxx.xxx.xxx

head is normally just a comment line.

frank4360 · 08-09-2013, 03:42 AM

Quote:

Originally Posted by camorri

Edit the file /etc/resolv.conf and add the nameservers IP addresses. The entries will look like this:

You need to change the IP addresses to the IP addresses supplied by your ISP. The first two I listed are for my ISP. The next two are google name servers. If you do not know the IP's for your ISP, then try the last two. They should work, but may not be as fast as your ISP's name servers. Let us know.

Thanks for all the help.

In xubuntu (and presumably all Ubuntu flavours) there is a warning not to directly update the /etc/resolv.conf file, so I did the following:-

1. Added

Code:

nameserver 8.8.8.8
nameserver 8.8.4.4

to /etc/resolvconf/resolv.conf.d/base
You need to be root to do this; in my case

Code:

sudo leafpad

to get the editor.

2.

Code:

sudo resolvconf -u

(to update the required file)

This gave me internet connectivity, and so I looked up the DNS nameserver for my ISP (Orange France) at web site "who.is/dns/orange.fr/". I then did steps 1 & 2 again to add the nameservers in the first 2 positions of the "base" file.

Thanks again.