For mutlti-interfaced hosts, the default gateway is based on the

Interface whose ifcfg script is evaluated last. This sometimes causes
problems.

This PR is to explicitly set gateway dev so network interfaces will
have a predictable behavior.

Author: dpengla

tasks/redhat.yml

@@ -24,3 +24,11 @@
   template: src=route_{{ ansible_os_family }}.j2 dest={{ net_path }}/route-{{ item.device }}
   with_items: "{{ network_bridge_interfaces }}"
   when: network_bridge_interfaces is defined and item.route is defined
+
+- name: Cleanup gateway dev that does not set to the one we want
+  lineinfile: dest=/etc/sysconfig/network regexp="^GATEWAYDEV=(?!{{ gateway_dev }})" state=absent
+  when: gateway_dev is defined
+
+- name: Explicitly set gateway dev    
+  lineinfile: dest=/etc/sysconfig/network line="GATEWAYDEV={{ gateway_dev }}"
+  when: gateway_dev is defined