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binarytemple/centos.configure.networking.gateway.on.different.subnet.markdown

Last active February 4, 2016 11:32
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centos.configure.networking.gateway.on.different.subnet.markdown

CentOS 6.7 - configuring networking where the gateway is on a different subnet

If I were to have configured routing from the command line (or an init script) I would have entered the following:

route add -net 172.27.209.0/24 eth0
route add -net 172.27.211.0/24 eth0
route add default gw 172.27.211.254

In this case the :

  • Host IP address is '172.27.209.217/24' on eth0
  • Gateway IP address is '172.27.211.254'
  • The machine needs to also talk to machines in the '172.27.211.0/24' subnet

But this is CentOS... Lets take a look at what needs to be configured:

# cat /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=sekrit001
GATEWAY=172.27.211.254

# cat /etc/sysconfig/network-scripts/ifcfg-eth0 
DEVICE=eth0
HWADDR=00:50:56:A1:76:C8
TYPE=Ethernet
UUID=db502574-6359-4d8b-ba44-848a25701cf6
ONBOOT=yes
BOOTPROTO=static
IPADDR=172.27.209.217  
NETMASK=255.255.255.0

# cat /etc/sysconfig/network-scripts/route-eth0 
172.27.211.0/24 dev eth0
default via 172.27.211.254

After this, execute service network restart and everything works.

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