General :: Use Dhcp Again To Get IP
May 15, 2010
I had statically set my ip in Linux using:
sudo ifconfig eth0 192.168.blah.blah
Now I want it to go back to using DHCP to assign the IP. How do I do that?
This is what I see when I run dhclient
Internet Systems Consortium DHCP Client V3.1.2
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
Listening on LPF/eth0/08:00:27:9b:43:09
Sending on LPF/eth0/08:00:27:9b:43:09
Sending on Socket/fallback
DHCPREQUEST of 192.168.56.104 on eth0 to 255.255.255.255 port 67
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Feb 8, 2010
first: PXE flawless bind to dhcp address but put next binding state to free second: when installer calls init script to reinit ethernet driver (e1000 (vmware)) binding fails 11.2 opensuse fail to reinit dhcp with log entry "no free leases" third: when manual set network install works how to preserve dhcp lease on reinit of driver?
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Oct 22, 2010
Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.
Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address. When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces
Code:
auto lo
iface lo inet loopback
auto vlan100
iface vlan100 inet static
[code]....
why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.
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Jul 1, 2010
Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.
Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address.
When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces
Code:
auto lo
iface lo inet loopback
auto vlan100
[code]....
why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.
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Mar 25, 2010
I am puzzled with trying to configure a linux (openSUSE) client to dhcp to eBox DHCP server. I am using dhclient to lease an IP address with dhclient eth0 -s 10.45.48.108 and get a response
openSUSE11232CL1 dhclient: DHCPDISCOVER on eth0 to 10.45.48.108 port 67 interval 4
openSUSE11232CL1 dhclient: DHCPOFFER from 10.45.48.108
openSUSE11232CL1 dhclient: DHCPREQUEST on eth0 to 10.45.48.108 port 67
openSUSE11232CL1 dhclient: send_packet: Network is unreachable
openSUSE11232CL1 dhclient: send_packet: please consult README file regarding broadcast address.
The server reports eBox141 dhcpd: DHCPDISCOVER from 00:0c:29:3e:57:a3 (openSUSE11232CL1.domain.net) via eth0
eBox141 dhcpd: DHCPOFFER on 10.45.200.2 to 00:0c:29:3e:57:a3 (openSUSE11232CL1.domain.net) via eth0
I interpret this as the server receives the request and the client accepting it but the lease does not last long and the connection breaks. what this could be and why the connection breaks? Or my undestanding is totally wrong on how it works and should work? And BTW, where is that README file that's referenced in the message I receive on the client?
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Mar 8, 2010
Currently I have my eth0 interface getting a DHCP address but at times the DHCP server will not be reachable. Sooo what I would like my server to do is if it cannot find a DHCP server assign a static address to eth0. Then start the DHCP service so it can then dish out some addresses.How can I do this? Surely it is possible
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Aug 4, 2010
I have an embedded device for which I've created an html configuration page. This page allows you to set static IPs, dhcp, and can scan for wireless devices.My problem is that in order to access the device it requires that it runs as a dhcp server otherwise people are not assigned an IP and so can not access the embedded devices static IP. (This config page is for the laymen and so they are not the type who are able to set up their own static IPs). One of the potential options is to have the device connect to the network on eth0 acting as a dhcp client. However this prevents me from running a dhcp server.One solution I can think of is running a dhcp server only if it doesn't detect another dhcp server running on the network.
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Oct 31, 2010
I have an embedded device for which I've created an html configuration page. This page allows you to set static IPs, dhcp, and can scan for wireless devices. My problem is that in order to access the device it requires that it runs as a dhcp server otherwise people are not assigned an IP and so can not access the embedded devices static IP. (This config page is for the laymen and so they are not the type who are able to set up their own static IPs). One of the potential options is to have the device connect to the network on eth0 acting as a dhcp client. However this prevents me from running a dhcp server. One solution I can think of is running a dhcp server only if it doesn't detect another dhcp server running on the network. However I have no idea how this could be setup.
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Apr 21, 2010
With Red Hat Linux as a DHCP server I want to connect windows xp so it may get ip address from the linux server on my test lab.Both of these computers are connected with a cross cable.
I assign ip assress to my eth0 192.168.1.10 with subnetmask 255.255.255.0
For the client i want that it may get Ip range from 192.168.1.50 to 192.168.1.55
Guide the minimum DHCP configuration so my client machine should get IP address from Linux server.
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Mar 25, 2010
How can we use DHCP to find or allocate ipaddress in ubuntu.I have connected Hawkboard, i need to known the ip address of my system and hawkboard. how can i find ip address of board connected to system, i have used serial port null modem cable and ethernet crossover cable between the board and system
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May 18, 2011
I have an ARM system that has been pre-loaded with some variant of Linux. I don't know the distribution; I can only see the kernel number in dmesg.
In /etc/network/interfaces, I set eth0 to
auto eth0
iface eth0 inet dhcp
After I save and reboot (or run ifdown eth0 followed by ifup eth0), I can see that the networking system is searching for a DHCP server and actually obtains a lease on a valid IP address, but when I run ifconfig, the interface has not been assigned the address that it pulled down from DHCP. It has been assigned a 192.168.. address.
I noticed in dmesg that a variable "ip" is passed to the kernel at boot with the same address that is overriding my DHCP address. How can I disable this overriding behavior? I noticed a dynamic environment variable in u-boot called ip. I set it dhcp and saved it to nv storage, but the problem persisted. I tried to set the u-boot environment variable ipaddr to dhcp, but was informed that this wasn't a valid value for the variable.How can I get the interface to be configured through DHCP?
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Jun 11, 2011
I have linux running on a cd rom, whenever I need to start linux on my computer i just insert the cd. however I want to copy a dhcp protocol from my users folder from my computer to the linux cd rom. The name of the dhcp protocol file on my computer is /users/bennett/downloads/dualserverv6.83, soI am wondering how do I do this when I'm running the linux software from cd rom from the same pc.
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Oct 16, 2010
NIC is connected to a LINKSYS WRT54G running DHCP. There are plenty of available IP assignments. All other PC that I have connected to the LINKSYS work fine. The CAT 5 cable is fine.Why is this NIC not taking a DHCP assignment ?
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Apr 28, 2010
to start, i'm fairly new to opensuse. my issue is that i'm trying to use opensuse as my router and need to configure DHCP.
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Jul 14, 2011
I am trying to set up a DHCP server for a network that does not go on the internet using fedora 14. I have tried several site and every one I look at has a different dhcpd.conf file. I have tried many and every time I try to start the service they fail. Like I said it does not go on the internet. No matter what I do when I try to start the dhcpd service it fails[root@pcrepair ~]# service dhcpd startStarting dhcpd: [FAILED]here is my current config file
# specify domain name
option domain-name
"server.world";
[code]....
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Aug 30, 2010
Regarding the PXE boot.I have three machine out of which Machine-1 is the server where necessary instruction are feeded(just like dhcp server).Now What I really want is the other Machines should PXE boot to the dhcp server. But the challenge is "ALL the Boxes are now under corporate DHCP environment".
One solution is VLAN but our IM team is not ready to assign seperate VLAN for 3 machines. Someone suggested me that it is possible that those 3 machines, if configured will always PXE boot to the dhcp. But I dont have any idea how to get it done.
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Sep 17, 2010
In school, use SUSE Server and made it by DHCP but in my hand I changed many rules. All are OK at the start but now they requested that they who are principal, and vice principals are want to use the Internet without filtering.
So I've made new rules by using Webmin software to control the SUSE Server. 1st I've gave static IP from LAN x.x.x.40 to x.x.x.45. 2nd IP is x.x.x.12 to x.x.x.15.
At First, there's nothing happen but now I've got problems because Server gave DHCP so that Server gives IP itself and conflict with static IPs. And also I can't find in Webmin software how to disable the DHCP Assign.
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Aug 13, 2010
I'm trying to configure in fedora 13 a dhcp client that would request IP address on my finished DHCP test server.
I've already configured dhcp on eth0 on the client machine,
here is the configuration on my DHCP test server
default-lease-time 600;
max-lease-time 7200;
ddns-update-style none;
authoritative;
option domain-name "sample.testnet.com";
[Code]....
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Apr 16, 2010
I want to create a dedicated DHCP server in Red Hat Linux for a small office with a private range from 192.168.1.10 to 192.168.1.20
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Aug 30, 2010
This may be a very basic question but I was wondering if there is a way through the command line to find out which interfaces are using dhcp. I'm using Ubuntu 9.10 in case that makes a difference.
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Mar 27, 2010
How to install DHCP server in ubuntu 9.10, i googled but not able to find correct how to. if anyone installed provide steps in configuring dhcp3.conf file
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Nov 25, 2010
I have assigned static IP to my machine but, somehow, NIS entries are getting chenged due to /sbin/dhclient-script
[Code]...
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Apr 6, 2009
I'm trying to do a red hat Advanced server 4 update 7 install using a kick start file on the network. The server with the kickstart file and dvd contents is on the same subnet as the server receiving the install. We have done it before in the past just fine using:linux nofb text ks=http://serverip/path at the boot/install screen. After that the ip address info is entered manually and the kickstart does its thing. When doing this with update 7, the install acts like a regular install. When i check the http access logs on the other server, it shows no access from the server receiving the install.I have tried adding an ip address to the install command. Such as:
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Apr 27, 2010
How to find in linux(fedora12) if dhcp is running on network?
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Jul 2, 2010
The DHCP server on a network I use specifies a DNS server that I do not want to use. Is there a way to continue to use DHCP but to modify the provided information or to "blacklist" one (of the three provided) DNS servers?
The client in question is running Ubuntu 10.04. Networking is managed by NetworkManager but I'm not wedded to that. In fact, I don't like it and wouldn't mind a reason to use something else.
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Mar 7, 2011
How can i set my OpenWrt 10.03 router to not to use 192.168.1.0/24? instead, use a /32 mask, so every client, that gets an ip from the DHCP server just can't sniff the network traffic - it would be a great security feature to safely use e.g.: FTP!
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Feb 26, 2011
I have Dell rack server. With the network card of five network ports. But I am just using first one (eth0).
Now the problem:
Its connected the internet and the internet is working fine. I also got update using yum.
When I do ifconfig to check its dynamic IP. It also shows the IP(something like: 192.168.x.x), but if I go to services and try to start DHCPd service its fails. Its not starting at all. And If I go to other computer (Windows 7) and try to ping the dell servers IP, I cannot ping it. So since I cannot ping it from other computer, so no one we can have remote access to the dell server.
I dont understand without starting DHCPd how the dell server is getting the IP address.
So I thought maybe DHCP is corrupted so I removed it using yum and reinstalled it using yum, but no luck so far.
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Oct 14, 2010
commands to create a DHCP server in RHEL 5.1
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Aug 16, 2010
I am trying to set up a DUAL WAN Load balancer on linux. All i want is just the dual wan loadbalancing and nothing else not even the firewall service. Also what would be the ideal configration for that system
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