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before SSO login Advanced Search Forum The Ubuntu Forum Community Ubuntu Specialised Support Ubuntu Servers, Cloud and Juju Server Platforms [ubuntu] dhclient error Having an Issue With Posting ? Do you want to dhclient rtnetlink answers: file exists help us debug the posting issues ? < is the place to report it, thanks ! Results 1 to 7 of 7 Thread: dhclient error Thread Tools Show Printable Version Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode May 25th, 2008 #1 Mr.Carramba View Profile View Forum Posts Private Message A Carafe of Ubuntu Join Date Nov 2006 dhclient disable Beans 124 DistroUbuntu 12.04 Precise Pangolin dhclient error Hi! I have started to read server logs, and find a lot of following error: dhclient: can't create /var/lib/dhcp3/dhclient.eth0.leases: Permission denied What does it mean, and how to fix it? Adv Reply May 25th, 2008 #2 Gunman1982 View Profile View Forum Posts Private Message Tea Glorious Tea! Join Date Apr 2008 Location Germany - Berlin Beans 340 Re: dhclient error It means that you don't have permission to write the file dhclient.eth0.leases in the directory /var/lib/dhcp3/ . Did you execute 'sudo dhclient' or just 'dhclient'? You sould have root priviliges if you run this command. Adv Reply May 26th, 2008 #3 Mr.Carramba View Profile View Forum Posts Private Message A Carafe of Ubuntu Join Date Nov 2006 Beans 124 DistroUbuntu 12.04 Precise Pangolin Re: dhclient error Originally Posted by Gunman1982 It means that you don't have permission to write the file dhclient.eth0.leases in the directory /var/lib/dhcp3/ . Did you execute 'sudo dhclient' or just 'dhclient'? You sould have root priviliges if you run this command. ok, I haven't stated question clearly, my bad. I do not execute this command, I found it

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Dhclient Eth0

& Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute: Sign up Here's how it https://ubuntuforums.org/showthread.php?t=807148 works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Renew IP with dhclient on different interfaces up vote 6 down vote favorite I have two interfaces on my computer, eth0 and eth1. Both subnets have a DHCP server on them. How could I use dhclient to renew IP address for both interfaces? If I do: http://unix.stackexchange.com/questions/77579/renew-ip-with-dhclient-on-different-interfaces dhclient -r && dhclient eth0 It renews the IP on eth0. Then, if I want to just do: dhclient eth1 It fails with error: dhclient(22421) is already running - exiting. I can do: dhclient -r && dhclient eth1 But the dhclient -r part releases the lease and I loose the IP address on eth0 as well. For now, the only way I've managed to do what I want is to run dhclient for eth0, brutally kill it, and run it on eth1: I end up with a renewed IP on both interfaces. I also tested with dhclient -x instead of dhclient -r, no luck. Surely, this is not the way to go! EDIT: Two answers suggested doing dhclient -r eth0 eth1 && dhclient eth0 eth1 This, indeed, limits the broadcast calls to these interfaces. But the first DHCP server to answer will be the only one used, hence resulting in a new IP on a single interface and not both. See here, we can see DHCPDISCOVER calls on both interfaces, but the DHCPREQUEST is only done on eth0, first interface through which a DHCP server was found: Listening on LPF/eth0/0a:00:27:00:00:00 Sending on LPF/eth0/0a:00:27:00:00:00 Listening on LPF/eth1/84:8f:69:d

Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers http://serverfault.com/questions/601450/dhclient-what-does-rtnetlink-answers-file-exists-mean or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server http://www.cyberciti.biz/faq/howto-linux-renew-dhcp-client-ip-address/ Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top dhclient: What does “RTNETLINK answers: File exists” Mean? up vote 17 down vote favorite 5 I wanted to update the DHCP dhclient error lease of an Amazon EC2 instance, so I executed the following command: user@host:~$ sudo dhclient Following that, the system's DHCP lease is updated successfully updated. However, the command prints the following to the console: RTNETLINK answers: File exists What on earth does that mean? Is it a cause for concern? For what it's worth, dhclient returned without any errors: user@host:~$ echo $? 0 linux dhcp dhclient share|improve this question edited Jun 3 '14 at 13:14 asked Jun 3 '14 at 12:59 what does dhclient AlfaZulu 235128 duplicate of serverfault.com/questions/403969/failed-to-bring-up-wlan0 –Dennis Nolte Jun 3 '14 at 13:21 1 The user in the post you reference gets the error Failed to bring up wlan0. I don't get any output besides RTNETLINK answers: File exists. –AlfaZulu Jun 3 '14 at 13:23 yes and its the same reason why you get it. adding a route which is already in the table. simple test: disable your interface, enable your interface. first time dhclient run the message will not appear. just confirmed this locally on a debian system. –Dennis Nolte Jun 3 '14 at 13:29 This machine is an Amazon EC2 instance, I can't take down the interface for obvious reasons. I guess my question basically is, what is the right way to renew my DHCP leases given that I can't up/down my interfaces? –AlfaZulu Jun 3 '14 at 13:32 then this might answers your "new" question: askubuntu.com/questions/151958/… if thats not "enough you can remove the old lease within /var/lib/dhcp/dhclient.leases (might be slightly different location on EC2) dhclient -r –Dennis Nolte Jun 3 '14 at 13:40 add a comment| 1 Answer 1 active oldest votes up vote 12 down vote accepted Basically what happens is that dhclient adds a route to the routing table. It tries this while the route is already in the table. Check ip route for a route which was added by the dhcp server. For having the lease renew

CentOS, Debian / Ubuntu, Linux, Networking, RedHat and FriendsI‘m using Ubuntu Linux. How to force Linux to reacquire a new IP address from the DHCP server? What is the command in Linux equivalent to Windows' "ipconfig /renew" command? You need to use Dynamic Host Configuration Protocol Client i.e. dhclient command. The client normally doesn't release the current lease as it is not required by the DHCP protocol. Some cable ISPs require their clients to notify the server if they wish to release an assigned IP address.

The dhclient command, provides a means for configuring one or more network interfaces using the Dynamic Host Configuration Protocol, BOOTP protocol, or if these protocols fail, by statically assigning an address.Linux renew ip commandThe -r flag explicitly releases the current lease, and once the lease has been released, the client exits. For example, open terminal and type the command: $ sudo dhclient -r Now obtain fresh IP: $ sudo dhclient How can I renew or release an IP in Linux for eth0?To renew or release an IP address for the eth0 interface, enter: $ sudo dhclient -r eth0
$ sudo dhclient eth0 In this example, I am renewing an IP address for my wireless interface:sudo dhclient -v -r eth0 sudo dhclient -v eth0Sample outputs:Fig.01: Renew DHCP address example The -v option shows information on screen about dhcp server and obtained lease.Other options in Linux to renew dhcpThere is no need to restart network service. Above command should work with any Linux distro such as RHEL, Fedora, CentOS, Ubuntu and others. On a related note you can also try out the following commands: # ifdown eth0
# ifup eth0
### RHEL/CentOS/Fedora specific command ###
# /etc/init.d/network restart OR ### Debian / Ubuntu Linux specific command ###
# /etc/init.d/networking restart nmcli command (NetworkManager) to renew IP address in LinuxThe NetworkManager daemon attempts to make networking configuration and operation as painless and automatic as possible by managing the primary network connection and other network interfaces, like Ethernet, WiFi, and Mob

 

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dhclient error messages p -g relay -n -nw -w -x if ifN DESCRIPTION The dhclient example Internet Systems Consortium DHCP Client dhclient provides a means for configuring one or more Dhclient conf Example network interfaces using the Dynamic Host Configuration Protocol BOOTP protocol or if these protocols fail by statically assigning an address OPERATION The Dhclient Config File DHCP protocol allows a host to contact a central server which main- tains a list of IP addresses which may be assigned on one or more sub- nets A DHCP client may request an address Linux Dhclient Renew from this pool and