PB : DNS Client don't ping internet

[Thibault]

Hi,

I have my router (192.168.1.1) connected to the internet.
I have installed Debian on a server with Bind9 (192.168.1.254).
The configurations files are :

$ cat /etc/network/interfaces
# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0 
iface eth0 inet static
address  192.168.1.254
netmask  255.255.255.0
network  192.168.1.0
broadcast  192.168.1.255
gateway  192.168.1.1

$ cat /etc/bind/named.conf
include "/etc/bind/named.conf.options";
include "/etc/bind/named.conf.local";
include "/etc/bind/named.conf.default-zones";

$ cat /etc/bind/named.conf.options
options {
directory "/var/cache/bind";
 forwarders {
 192.168.1.1;
 };

auth-nxdomain no;    # conform to RFC1035
listen-on-v6 { any; };

version none;
allow-query { 192.168.1.0/24; };
allow-transfer { none; };
};

$ cat /etc/bind/named.conf.local
zone "mywidi.me" {
     type master;
     file "/etc/bind/db.mywidi.me";
};

zone "1.168.192.in-addr.arpa" {
     type master;
     file "/etc/bind/db.1.168.192";
}

$ cat /etc/bind/named.conf.default-zones 

zone "." {
type hint;
file "/etc/bind/db.root";
};

zone "localhost" {
type master;
file "/etc/bind/db.local";
};

zone "127.in-addr.arpa" {
type master;
file "/etc/bind/db.127";
};

zone "0.in-addr.arpa" {
type master;
file "/etc/bind/db.0";
};

zone "255.in-addr.arpa" {
type master;
file "/etc/bind/db.255";
};

$ sudo cat /etc/resolv.conf
search mywidi.me
nameserver 192.168.1.254

From this DNS server, I can ping local hosts and internet (as google.com) .

I have another server (kind of client DNS) with these settings :

$ cat /etc/network/interfaces

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
address  192.168.1.160
netmask  255.255.255.0
network  192.168.1.0
broadcast  192.168.1.255
gateway  192.168.1.254

$ cat /etc/resolv.conf
search MYWIDI.ME
nameserver 192.168.1.254

My problem is this second debian server (without DNS) succeeds to ping other local hosts but fails pinging google.com. The wirest thing is ping succeeds to get google.com ip address as displayed :

$ ping google.com
PING google.com (74.125.224.50) 56(84) bytes of data.

but the command is waiting and waiting ...

Thank you for your help, i will appreciate it

[antony_pradeep]

192.168.1.160 machine resolve google.com means your 192.168.1.254 dns working fine. and forward ip in your machine in 192.168.1.254 by this command "echo 1 > /proc/sys/net/ipv4/ip_forward" and after from 192.168.1.160 it will ping.

[rcgreen]

gateway 192.168.1.254

The second machine should not be using the name server
as its gateway. They should both use the router as the gateway.

[Thibault]

On the DNS server i have edited /etc/sysctl.conf by enabling
net.ipva4.ip_forward=1.
On the test machine i kept the DNS as a gateway and now it works.

Thnak you for your help