Question

21

connect: Network is unreachable? - ping

rated 0 times [ 21] [ 0] / answers: 1 / hits: 499049 / 2 Years ago, tue, april 12, 2022, 12:37:20

When I attempt to ping google's dns or any outside the network I get
connect: Network is unreachable?

I can't update either which I put down to this

I am new to networking... And Ubuntu. But these are results of some commands I thought might help

$ ip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

    inet6 ::1/128 scope host 

       valid_lft forever preferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000

    link/ether 00:0e:7f:a9:10:54 brd ff:ff:ff:ff:ff:ff

    inet 192.168.0.5/24 brd 192.168.0.255 scope global eth0

    inet6 fe80::20e:7fff:fea9:1054/64 scope link 

       valid_lft forever preferred_lft forever

3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN 

    link/ether 86:0b:cb:43:63:a5 brd ff:ff:ff:ff:ff:ff

    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0

mcserver@helloworld:~$ 



$ vi /etc/resolv.conf:

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)

#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

nameserver 192.168.0.5

nameserver 8.8.8.8



$ vi /etc/network/interfaces

# The loopback network interface

auto lo

iface lo inet loopback



# The primary network interface

auto eth0

iface eth0 inet static

        address 192.168.0.5

        netmask 255.255.255.0

        network 192.168.1.0

        broadcast 192.168.0.255

        post-up iptables-restore < /etc/iptables.up.rules

        dns-nameservers 192.168.0.5 8.8.8.

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answered 2 Years ago urvedcaly · Accepted Answer

The following line is wrong:

iface eth0 inet static

    address 192.168.0.5

    netmask 255.255.255.0

    network 192.168.1.0 <<<<<<<<<<<<<<<<<<<<<<<< It should be 192.168.0.0

    broadcast 192.168.0.255

    post-up iptables-restore < /etc/iptables.up.rules

    dns-nameservers 192.168.0.5 8.8.8.8

Also, there doesn't seem to be any default gateway setup.

Not having more info about your network, I would suggest adding the following line at the end:

    gateway <YOUR.ROUTER.IP.ADDRESS>

So, assuming your router ip address is 192.168.0.1, this would be the whole entry:

iface eth0 inet static

    address 192.168.0.5

    netmask 255.255.255.0

    network 192.168.0.0

    broadcast 192.168.0.255

    post-up iptables-restore < /etc/iptables.up.rules

    gateway 192.168.0.1

    dns-nameservers 192.168.0.5 8.8.8.8