81
24
What is the Linux command to clear IP address of an interface without bringing it down and/or restarting network services. Seems strange ifconfig is able to change IP address but has no option to clear it, or am I wrong?
jackhab
Posted 15 years ago
Reputation: 2 176
142
Use ip from iproute2. (You need to also specify the prefix length though.)
ip addr del 10.22.30.44/16 dev eth0
To remove all addresses (in case you have multiple):
ip addr flush dev eth0
user1686
Posted 15 years ago
Reputation: 283 655
Works, but when I do want to a non-dev permanent change, I get an error saying "eth0 is garbage" (lol). i guess i need to manually edit that file, just can't remember the name right now – Housemd – 8 years ago
23
As simple as ifconfig eth0 0.0.0.0. They should have put it in the manual.
jackhab
Posted 15 years ago
Reputation: 2 176
11
To remove all adreses from all interfaces i used for loop:
for i in $(ls /sys/class/net/) ; do
/usr/sbin/ip addr flush $i &
done
eri
Posted 15 years ago
Reputation: 246
1
Perhaps you are just looking to get a new IP from the [DHCP-enabled] router? In this case call
dhclient eth0
CodyBugstein
Posted 15 years ago
Reputation: 1 174
THAT worked, whereas assigning an IP didn't somehow get the network working. Thank you. – Rich_F – 5 years ago
1@Andy: I think you misunderstood the question. @jackhab wants to unassign an address from the interface, not set it to
0.0.0.0-- it's just how it is done withifconfig. – user1686 – 15 years ago@grawity Cheers. Unassigning an address is switching the NIC off to all intents and purposes? – Andy – 15 years ago
@Andy: Not necessarily. One could still watch incoming packets. Also, a NIC can have multiple addresses (though it doesn't apply in this case). – user1686 – 15 years ago
See also https://serverfault.com/questions/407676/deleting-all-ips-on-an-interface-with-iproute2
– pevik – 8 years ago