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Dhclient Example

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Dhclient Config File

users and developers. 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 rtnetlink answers: file exists Problems running dhclient up vote 1 down vote favorite After running apt-get upgrade and restarting an Ubuntu Server install I noticed the computer didn't have a network connection. I checked ifconfig ~$ ifconfig lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:7376 errors:0 dropped:0 overruns:0 frame:0 TX packets:7376 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:1424 (1.4 KB) TX bytes:1424 (1.4 KB) The dhclient disable interface 'em1' was missing :/ So I tried ifconfig em1 up which brought the interface up and then dhclient em1 to get an IP address, but I ran into this error: ~$ dhclient em1 dhclient: error while loading shared libraries: libc.so.6: failed to map segment from shared object: Permission denied ~$ dhclient dhclient: error while loading shared libraries: libc.so.6: failed to map segment from shared object: Permission denied Does anyone have any idea what could be wrong? A number of people seemed to have issues with SELinux blocking dhclient, but even with setenforce 0 I get this issue. I've used dhclient to manually bring up an interface on this computer before so I'm not sure what suddenly changed (and what changed to stop the interfacing auto-setting up on startup). EDIT: The network adapter is fine and everything works when the ip/route/nameservers are set manually Reinstalling isc-dhcp-client and isc-dhcp-common didn't help, nor did reinstalling libc6 EDIT2: I tried gertvdijk's suggestions. My /etc/network/interfaces is: auto lo iface lo inet loopback allow-hotplug em1 iface em1 inet dhcp I tried sudo ifup em1 but I get the same error :( ~$ sudo ifup em1 dhclient: error while loading shared libraries: libc.so.6: failed to map segment from shared object: Permission denied Failed to bring up em1. bo

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Dhclient Eth0

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 works: Anybody can ask a question Anybody can answer http://askubuntu.com/questions/310619/problems-running-dhclient 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: dhclient -r && dhclient eth0 It renews the IP on eth0. Then, if http://unix.stackexchange.com/questions/77579/renew-ip-with-dhclient-on-different-interfaces 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:d3:d4:a1 Sending on LPF/eth1/84:8f:69:d3:d4:a1 Sending on Socket/fallback DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5 (xid=0x170fcb67) DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval

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 http://serverfault.com/questions/601450/dhclient-what-does-rtnetlink-answers-file-exists-mean About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is https://linux.die.net/man/8/dhclient-script 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 dhclient error 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 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: what does dhclient 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 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 th

to set each interface's initial configuration prior to requesting an address, to test the address once it has been offered, and to set the interface's final configuration once a lease has been acquired. If no lease is acquired, the script is used to test predefined leases, if any, and also called once if no valid lease can be identified. This script is not meant to be customized by the end user. If local customizations are needed, they should be possible using the enter and exit hooks provided (see HOOKS for details). These hooks will allow the user to override the default behaviour of the client in creating a /etc/resolv.conf file, and to handle DHCP options not handled by default. No standard client script exists for some operating systems, even though the actual client may work, so a pioneering user may well need to create a new script or modify an existing one. In general, customizations specific to a particular computer should be done in the /etc/dhcp/dhclient.conf file. If you find that you can't make such a customization without customizing /etc/dhcp/dhclient.conf or using the enter and exit hooks, please submit a bug report. Hooks When it starts, the client script first defines a shell function, make_resolv_conf , which is later used to create the /etc/resolv.conf file. To override the default behaviour, redefine this function in the enter hook script. On after defining the make_resolv_conf function, the client script checks for the presence of an executable /etc/dhcp/dhclient-enter-hooks script, and if present, it invokes the script inline, using the Bourne shell '.' command. The entire environment documented under OPERATION is available to this script, which may modify the environment if needed to change the behaviour of the script. If an error occurs during the execution of the script, it can set the exit_status variable to a nonzero value, and /sbin/dhclient-script will exit with that error code immediately after the client script exits. After all processing has completed, /sbin/dhclient-script checks for the presence of an executable /etc/dhcp/dhclient-exit-hooks script, which if present is invoked using the '.' command. The exit status of dhclient-script will be passed to dhclient-exit-hooks in the exit_status shell variable, and will always be zero if the script succeeded at the task for which it was invoked. The rest of the environment as described previously for dhclient-enter-hooks is also present. The /etc/dhcp/dhclient-exit-hooks script can modify the valid

 

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dhclient error messages

Dhclient Error Messages table id toc tbody tr td div id toctitle Contents div ul li a href Dhclient Example a li li a href Dhclient Config File a li li a href Dhclient leases Location a li li a href Dhclient-script a li ul td tr tbody table p -g relay relatedl -n -nw -w p h id Dhclient Example p -x if ifN DESCRIPTION The Internet dhclient conf example Systems Consortium DHCP Client dhclient provides a means for configuring one or more network interfaces using the Dynamic Host p h id Dhclient Config File p Configuration Protocol BOOTP