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I have recently started to configure my network using /etc/network/interfaces for a static IP address. For this I have added the following lines into the file:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static

I have also changed managed=true in /etc/NetworkManager/NetworkManager.conf.

Everything works fine so far.

Today I realized that I have two identical default gateways (via a bash default gateway failover bash script that wouldn't work because of that reason).

Route shows the following:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         UG    0      0        0 eth0
default         UG    100    0        0 eth0
link-local      *          U     1000   0        0 eth0     *        U     0      0        0 eth0

The default gateway shows up twice, once with metric 0 and once with 100. Is this the way it is supposed to be?

There are no files in /etc/NetworkManager/system-connections so I have no idea where that gateway is coming from. I don't have any scripts running that would add the gateway.

How do I remove one of them so it's gone permanently?

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I could solve this problem by changing managed=false in /etc/NetworkManager/NetworkManager.conf

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