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rated 0 times [  21] [ 0]  / answers: 1 / hits: 499024  / 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.

More From » networking

 Answers
4

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

[#27148] Wednesday, April 13, 2022, 2 Years  [reply] [flag answer]
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