I think I have a routing problem. I have set up a CentOS VM, it is connected to my network and I can ping other machines.

I cannot however ping anything outside of my network.

[root@localhost ~]# ping 8.8.8.8 connect: Network is unreachable 

I also set up port forwarding on my router to forward SSH on port 22 to this machine and I cannot access it outside of my network (using putty).

Here is the output of ip route:

[root@localhost ~]# ip route 10.0.0.0/24 dev enp0s3 proto kernel scope link src 10.0.0.10 169.254.0.0/16 dev enp0s3 scope link metric 1002 

Here is the contents of /etc/sysconfig/network-scripts/ifcfg-enp0s3:

TYPE="Ethernet" BOOTPROTO="static" IPADDR=10.0.0.10 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="enp0s3" UUID="17eeb7fe-f11c-4b8b-83be-a9dd2281dda2" DEVICE="enp0s3" ONBOOT="yes" 
2

4 Answers

Based on the errors, you need to update the files to look like this:

/etc/sysconfig/network-scripts/ifcfg-enp0s3:

TYPE="Ethernet" BOOTPROTO="static" IPADDR=10.0.0.10 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="enp0s3" UUID="17eeb7fe-f11c-4b8b-83be-a9dd2281dda2" DEVICE="enp0s3" ONBOOT="yes" 

/etc/sysconfig/network:

NETWORKING=yes HOSTNAME=centos7 GATEWAY=10.0.0.1 

/etc/resolv.conf:

nameserver 8.8.8.8 nameserver 8.8.4.4 
4

Add this command:

route add default gw [your gateway IP address] 
2

why don't you just change it to dhcp, look for a proper IP and then set it to static with that IP?

1

Add a default gateway

# route add default gw 10.0.0.10 enp0s3 
1

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