Web Reference: Why does ifdown say interface is not configured while interface is clearly up? Because interface runtime state can exist outside ifupdown declarations. ifdown only acts on interfaces known to its configuration model. Jul 11, 2025 · Unlike the 'ifup' command, which activates the network interface, 'ifdown' places the interface in a non-operational state, preventing it from handling network traffic. Here, we will cover everything you need to know about the 'ifdown' command, its syntax, options, and practical examples. ifdown thinks the interface is already down. If that's not true, because it was brought up using some command other than ifup (ifconfig for example) then you need to shut it down the same way (ifconfig eth0 down).
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