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Linux IPv6 HOWTO (en)
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5.2. Bringing interfaces up/down

Two methods can be used to bring interfaces up or down.

5.2.1. Using "ip"

Usage: 

# ip link set dev <interface> up
# ip link set dev <interface> down

Example:

# ip link set dev eth0 up
# ip link set dev eth0 down

5.2.2. Using "ifconfig"

Usage: 

# /sbin/ifconfig <interface> up
# /sbin/ifconfig <interface> down

Example:

# /sbin/ifconfig eth0 up
# /sbin/ifconfig eth0 down
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