Set single Default Gateway on instance inspite of having attached to mulitple networks.

Solution Verified - Updated -

Issue

  • Instance is attached to two or more provider networks but only one default gateway is required.

    # route -n
    Kernel IP routing table
    Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
    0.0.0.0         192.168.123.254 0.0.0.0         UG    100    0        0 eth0      #gateway1
    0.0.0.0         192.168.124.254 0.0.0.0         UG    101    0        0 eth1      #gateway2
    XXX.254.169.254 192.168.123.254 255.255.255.255 UGH   100    0        0 eth0
    192.168.123.0   0.0.0.0         255.255.255.0   U     100    0        0 eth0
    192.168.124.0   0.0.0.0         255.255.255.0   U     101    0        0 eth1
    
  • Need only one default gateway.

    # route -n
    Kernel IP routing table
    Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
    0.0.0.0         192.168.123.254 0.0.0.0         UG    100    0        0 eth0    # only gateway1 is required as default.
    XXX.254.169.254 192.168.123.254 255.255.255.255 UGH   100    0        0 eth0
    192.168.123.0   0.0.0.0         255.255.255.0   U     100    0        0 eth0
    192.168.124.0   0.0.0.0         255.255.255.0   U     101    0        0 eth1
    

Environment

  • Red Hat OpenStack Platform 13.0

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