Technical Note: How to Add a Host Route in CentOS7
Description
Scope
Version: CentOS7
Solution
Example of result:
> ip route add 11.11.11.11/32 via 192.168.8.1 dev eth 0
This route will be removed under the following circumstances.
1. A reboot of Network sentry
How to Add a Host Route in CentOS7
Scope
Version: CentOS7
Solution
Version: CentOS7
Host Routes define which interface Network Sentry uses to send traffic to a specific IP address.
Solution:
Add host route temporarily
ip route add <host IP addr>/32 via <gateway IP addr> dev <eth interface>
Example of result:
> ip route add 11.11.11.11/32 via 192.168.8.1 dev eth 0
> route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.8.1 0.0.0.0 UG 0 0 0 eth0
11.11.11.11 192.168.8.1 255.255.255.255 UGH 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 eth0
192.168.8.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
This route will be removed under the following circumstances.
1. A reboot of Network sentry
2. A restart of the network (service network restart)
To delete a host route:
ip route del <host IP addr>/32 via <gateway IP addr> dev eth0
Example of result:
> route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.8.1 0.0.0.0 UG 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 eth0
192.168.8.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
Make the host route permanent by editing /etc/sysconfig/static-routes file:
any host <host IP addr>//32 gw <gateway IP addr>
