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Two default routes with same metric


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Using NetworkManager on CentOS 7.6 I was able to create two default routes with same metric:



# nmcli connection eth0 modify ipv4.route-metric 10
# nmcli connection eth1 modify ipv4.route-metric 10
# nmcli connection up eth0
# nmcli connection up eth1
$ ip route
default via 192.168.1.1 dev eth0 proto dhcp metric 10
default via 192.168.1.1 dev eth1 proto dhcp metric 10


That's looking strange to me because I thought there possible only one default route with specific metric and if I try to achieve same routing table with ip I've got an error:



# sudo ip route add default via 192.168.1.1 dev eth1 proto dhcp metric 11
# sudo ip route add default via 192.168.1.1 dev eth0 proto dhcp metric 11
RTNETLINK answers: File exists


So basically I have two questions:



1) Is that a bug? If it's not how kernel interpret such a routing table?



2) How can I build such a routing table using ip command?










share|improve this question































    0















    Using NetworkManager on CentOS 7.6 I was able to create two default routes with same metric:



    # nmcli connection eth0 modify ipv4.route-metric 10
    # nmcli connection eth1 modify ipv4.route-metric 10
    # nmcli connection up eth0
    # nmcli connection up eth1
    $ ip route
    default via 192.168.1.1 dev eth0 proto dhcp metric 10
    default via 192.168.1.1 dev eth1 proto dhcp metric 10


    That's looking strange to me because I thought there possible only one default route with specific metric and if I try to achieve same routing table with ip I've got an error:



    # sudo ip route add default via 192.168.1.1 dev eth1 proto dhcp metric 11
    # sudo ip route add default via 192.168.1.1 dev eth0 proto dhcp metric 11
    RTNETLINK answers: File exists


    So basically I have two questions:



    1) Is that a bug? If it's not how kernel interpret such a routing table?



    2) How can I build such a routing table using ip command?










    share|improve this question



























      0












      0








      0








      Using NetworkManager on CentOS 7.6 I was able to create two default routes with same metric:



      # nmcli connection eth0 modify ipv4.route-metric 10
      # nmcli connection eth1 modify ipv4.route-metric 10
      # nmcli connection up eth0
      # nmcli connection up eth1
      $ ip route
      default via 192.168.1.1 dev eth0 proto dhcp metric 10
      default via 192.168.1.1 dev eth1 proto dhcp metric 10


      That's looking strange to me because I thought there possible only one default route with specific metric and if I try to achieve same routing table with ip I've got an error:



      # sudo ip route add default via 192.168.1.1 dev eth1 proto dhcp metric 11
      # sudo ip route add default via 192.168.1.1 dev eth0 proto dhcp metric 11
      RTNETLINK answers: File exists


      So basically I have two questions:



      1) Is that a bug? If it's not how kernel interpret such a routing table?



      2) How can I build such a routing table using ip command?










      share|improve this question














      Using NetworkManager on CentOS 7.6 I was able to create two default routes with same metric:



      # nmcli connection eth0 modify ipv4.route-metric 10
      # nmcli connection eth1 modify ipv4.route-metric 10
      # nmcli connection up eth0
      # nmcli connection up eth1
      $ ip route
      default via 192.168.1.1 dev eth0 proto dhcp metric 10
      default via 192.168.1.1 dev eth1 proto dhcp metric 10


      That's looking strange to me because I thought there possible only one default route with specific metric and if I try to achieve same routing table with ip I've got an error:



      # sudo ip route add default via 192.168.1.1 dev eth1 proto dhcp metric 11
      # sudo ip route add default via 192.168.1.1 dev eth0 proto dhcp metric 11
      RTNETLINK answers: File exists


      So basically I have two questions:



      1) Is that a bug? If it's not how kernel interpret such a routing table?



      2) How can I build such a routing table using ip command?







      centos route iproute nmcli gateway






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










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