[SOLVED] Cannot reach internet after setting IP address to static.

When I has CentOS 6.5, I had my IP set to this static address: 192.168.1.109.

That is what I wanted with CentOS 7. Unfortunately, I was not able to install CentOS 7 with a static IP address. It just would not let me.

So I edited ifcfg-enp3s0. I set up the static IP address, and it worked. I can ping other computers on my home network, and other computers can ping me. No problem.

Except I cannot reach the internet. I cannot ping yahoo.com by it's name, or by it's IP: 206.190.36.45. Other computers on my home network can reach the internet.

BTW: why did redhat rename eth0 enp3s0? What good does that do?

Also, why doesn't ifup or ifdown work anymore?

have you turned off the wireless & VPN enabled "network-manager"
and turned on the wired only "network"

ifup/ifdown will NOT work if you are using the desktop manager to handle the network
that is a DE plasmoid

I take you did not read the release notes to see what is NEW and what was REMOVED
http://wiki.centos.org/Manuals/ReleaseNotes/CentOS7
https://access.redhat.com/documentat..._Features.html

It looks to me like I am not using the network manager.

# nmcli dev status
DEVICE  TYPE      STATE      CONNECTION 
enp3s0  ethernet  unmanaged  --         
lo      loopback  unmanaged  --

# ip add
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
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 94:de:80:2f:c5:8b brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.109/24 brd 192.168.1.255 scope global enp3s0
       valid_lft forever preferred_lft forever
    inet6 2601:1:8900:2ba0:96de:80ff:fe2f:c58b/64 scope global dynamic 
       valid_lft 3593sec preferred_lft 3593sec
    inet6 fe80::96de:80ff:fe2f:c58b/64 scope link 
       valid_lft forever preferred_lft forever

# systemctl -l status NetworkManager.service
NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled)
   Active: active (running) since Tue 2014-12-16 11:45:30 MST; 1h 49min ago
 Main PID: 891 (NetworkManager)
   CGroup: /system.slice/NetworkManager.service
           └─891 /usr/sbin/NetworkManager --no-daemon

Dec 16 12:24:37 localhost.localdomain NetworkManager[891]: ifcfg-rh: parsing /etc/sysconfig/network-scripts/ifcfg-lo ...
Dec 16 12:24:37 localhost.localdomain NetworkManager[891]: ifcfg-rh: parsing /etc/sysconfig/network-scripts/ifcfg-lo ...
Dec 16 12:24:38 localhost.localdomain NetworkManager[891]: <info> (lo): link disconnected
Dec 16 12:24:38 localhost.localdomain NetworkManager[891]: ifcfg-rh: parsing /etc/sysconfig/network-scripts/ifcfg-lo ...
Dec 16 12:24:38 localhost.localdomain NetworkManager[891]: ifcfg-rh: parsing /etc/sysconfig/network-scripts/ifcfg-lo ...
Dec 16 12:24:38 localhost.localdomain NetworkManager[891]: ifcfg-rh: parsing /etc/sysconfig/network-scripts/ifcfg-lo ...
Dec 16 12:24:38 localhost.localdomain NetworkManager[891]: <info> (lo): link connected
Dec 16 12:24:38 localhost.localdomain NetworkManager[891]: ifcfg-rh: parsing /etc/sysconfig/network-scripts/ifcfg-lo ...
Dec 16 12:24:38 localhost.localdomain NetworkManager[891]: ifcfg-rh: parsing /etc/sysconfig/network-scripts/ifcfg-lo ...
Dec 16 12:24:41 localhost.localdomain NetworkManager[891]: <info> (enp3s0): link connected

/etc/sysconfig/network-scripts/ifcfg-enp3s0

HWADDR=94:DE:80:2F:C5:8B
TYPE=Ethernet
BOOTPROTO="static"
IPADDR=192.168.1.109
NETMASK=255.255.255.0
NM_CONTROLLED=no
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=enp3s0
UUID=5d4e826e-c447-4e55-bb99-9bcb4c3e2ad9
ONBOOT=yes

# ifconfig
enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.109  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 2601:1:8900:2ba0:96de:80ff:fe2f:c58b  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::96de:80ff:fe2f:c58b  prefixlen 64  scopeid 0x20<link>
        ether 94:de:80:2f:c5:8b  txqueuelen 1000  (Ethernet)
        RX packets 900  bytes 122981 (120.0 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 609  bytes 124118 (121.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 11438  bytes 2310427 (2.2 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 11438  bytes 2310427 (2.2 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Here is where I got the instructions about how to change to a static IP:

http://ask.xmodulo.com/configure-sta...ml#comment-294

I edited ifcfg-enp3s0 to include a GATEWAY. I also edited resolv.conf to include nameservers. And it works now. Thanks for the replies.

BTW: is it a lot of trouble to change enp3s0 to eth0 ?

Originally Posted by walterbyrd BTW: is it a lot of trouble to change enp3s0 to eth0 ?

http://www.freedesktop.org/wiki/Soft...nterfaceNames/

This behaviour can be disabled by adding "net.ifnames=0" as a kernel parameter.