I unplugged the network cable, then plugged back in a couple minutes later. Found that dhcpcd was still running, so done a killall -9 dhcpcd then executed dhclient…worked! Works for me on Ubuntu 9. It seems to me, that the network-manager does not notice the change. After sudo dhclient -r the command ifconfig eth0 shows no ip address at the interface. After sudo dhclient the command ifconfig eth0 shows an ip address again. After sudo dhclient -r the interface still has the IP address.
Set the MAC address in Ubuntu and Debian
Sure it has, depending on your dhcp server configuration. To do this remotely I simply put the two commands on a single line:. Well, it releases them, but when I renew it, it gives me the same ip back. I wanted a new IP. Is there way to force a NEW one?
You need to tell the dhcp server to issue a different one, typically I dhcp server will if it can issue the same address. You may be able to tell it to forget what it last issued, or you can usually make a mapping between the mac address of your nic and the ip you want, but generally unless you do something on the server it wil reissue the same address.
This information is usually stored in nonvolatile Flash memory, so it will survive a power-down and restart of the device. All the NICs had to be scrapped and replaced.
Your Answer
Oh, webmaster please fix the typos in my previous post… :- for network device names, use the same one of course, above I used ince eth0, then eth1. If the substitution was successful, the resulting line is printed because of the p at the end of the substitution. Perl, where, as usual, there are more than one ways to do it. This one is the same logic as the awk above. The -a tells perl to split each input line into the F array.
As some have commented, ifconfig is deprecated in favor of the ip command.
Randomize your WiFi MAC address on Ubuntu
So combining the various solutions and comments, I'd use:. Ubuntu Community Ask! Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 4 years, 2 months ago. Active 1 year, 5 months ago. Viewed 79k times. But I need to obtain as output only the MAC address, like: ab:cd:ef ac ab:cd:ef How can I obtain this?
Almo 3 3 bronze badges. Perl regex in grep "is highly experimental". Is this article useful? Yes No. The Complete Beginner's Guide to Ubuntu Linux for Beginners. Comments 4.
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Jul 31, at am. What purpose does changing the MAC address serve? Vamsi Krishna.