Red Hat :: Disable DHCP Client Requests On Rhel 5.4 64bit?
Jan 28, 2010
i want to disable all DHCP request, can i turn off the client that if a MAC address changes a dhcp request is not automatically made?reason for this: I have HP blade running with an Intel NC260M mezzanine card running with virtual connect. I have experienced problems with firmware levels with this card where the virtual connect mac address is ignored and the real MAC displayed. As we are using bonds on the servers and have 6 NICs installed we have to tie down the MAC address to a bond. A blade was replaced today without the firmware update and the real MAC appeared, a dhcp request was made and my-eth[2-3] and resolv.conf files were over-written by the dhcp supplied
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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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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 27, 2009
I have 4 partitions in my system, out of which two(sda1, sda2) have windows on them. I have installed RHEL 4 32 - bit on sda3 and after that , installed installed RHEL 64-bit on to a partition sda 5. Now i am unable to boot into RHEL 32-bit. The error i am getting is Error 13: Invalid or unsupported executable format.
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Dec 27, 2010
Background:I have a small PC104 running opensuse 11.1. I'm writing a small client/server application for debugging purposes using mono and WCF. All the client does is make a request for information every 100ms.Problem:After about 20 requests the server quits responding to the client. Even if the client is running on the same machine. I've run the exact code on another laptop running opensuse as well as a laptop running windows and everything works great. Hopefully that closes the option that it is a code, mono, or opensuse flaw.Is there a kernel option or a network option that anyone knows about that might cause this sort of behavior?
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Jul 30, 2010
I have installed RHEL 5.1 in VMWare 6 I want to configure one RHEL Server with DNS & DHCP Also I would like to PXE boot, whenever I create a new VMWare Client(RHEL), the installation should be initiated via network boot
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Jul 5, 2010
here to learn some good technical stuffs
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May 1, 2011
i'd like to configure a dhcp server on my RHEL 5.3 or Fedora 14, since i don' have a legitimate DNS server....n it asks for option domain-name " "what do i put in there.. me got two nics for my WAN(dhcp enabled) n LAN...i just want to parctice at home for my future job...
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Oct 14, 2010
commands to create a DHCP server in RHEL 5.1
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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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Aug 3, 2011
I am new to linux.
I am trying to get vnc setup on my workstation.
I will paste some of the steps I have taken.
I downloaded the tigervnc and tigervnc-server through yum.
I setup the service file as so
Then when I go to start my server i get a FAILED message:
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Dec 14, 2010
I think the gx620 is called "64-bit capable" or something like that. I get the idea it's not a true 64-bit machine. I am thinking about getting CentOS 6.x (when it comes out) to learn rhel 6.x. Some features, like KVM, only work on 64-bit. I am seeing gx620s on craigslist for about $100.
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Apr 7, 2010
I am contemplating the use of DHCP options as a way of passing host-specific information to hosts that are booting disklessly from a network server. My intention is to have the DHCP client request certain options, and use the reply to configure the diskless hosts accordingly. The theory and rules behind all of this seem well documented on web sites such as die.net. However, the practical application of the protocol seems to be a lot less clear. What I am looking for is an explanation of what (existing, I hope) tool(s) are used, and how they are applied so that I can grab information from the DHCP server, and use it in userspace scripts or other programs. Specifically, my intention is to use a locally defined option that would give a host-specific directory name or filesystem to use by the diskless host to obtain host-specific applications and configuration data.
So far, all of the DHCP client documentation I've found relates to the usual function of assigning IPs, etc. I've looked at dhclient-script on a Redhat system and can't figure out the relationship between it and the dhclient program. Clearly, the script is invoked somehow by dhclient, but I don't understand where the transfer of data received from the server gets into the script. Does dhclient just create a list of exported environment variables the child script then gets access too? What are the rules for how variables are created and what variables are created?
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Oct 27, 2010
I am trying to install ununtu 10.04 but it fails every time with a message which flashes on and off with a message - mp bios bug no dhcp client installed at least I think that is what it says, it is on and off so fast. I have used Ubuntu for around three months but I also have to use windows for my work and this first started when I upgraded to win 7 and the pc gradually slowed down and became impossible to use. It also refuses to install. I suspect that I probably picked up a bug during installation of win 7 and new memory. I am having to type this on my wife's laptop.
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Aug 23, 2010
I'm a newbie to Linux and need some help in DHCP client configuration.
I'm trying to find a way to set hostname at the start up and get the DHCP client to register itself after it received an IP address.
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Jul 2, 2010
From the GUI, there is an option in the network settings "Automatically obtain DNS information from provider", just wondering how do we set or disable the same option through the command line, which files do we have to modify?
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Dec 28, 2010
I have a VMware farm where:
- DHCP is in use to give machines IPs
- Machines go up and down all the time
- All IPs are on a certain subnet
- VMs update DNS (we don't go by IP)
- SSH is in use
I would like to disable StrictHostKeyChecking only for this subnet, because IPs change all the time and editing known_hosts usually only works for a few days before the IP changes again, and once I get enough entries, there are tons of conflicts.
I tried the following in ~/.ssh/config:
Code:
Host 10.0.217.*
StrictHostKeyChecking no
UserKnownHostsFile /dev/null
[Code]....
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Jan 31, 2011
My company has an RHEL 5.0 server on which we have been instructed by outside auditors to disable or uninstall NIS. I'm not finding a method for doing so in my on-line searches.
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Sep 28, 2010
I have an embedded device which acts as a client, and a server at office. The IP address of the client is allocated by DHCP, so its IP address is actually variable. I would like to know what is the simpliest way to maintain the communication between client and server when DHCP is enabled. I once used socket many years ago to communicate between the client and the server. If I remember it right, I actually bypassed the dynamic IP issues by using the computer name to replace the IP address. Even the client is not at the same local network as the server, the scheme still worked. Correct me if my memory cheated me. if socket is still the best solution for this kind of application involving DHCP? I also heard from someone that it is necessary to implement multicast discovery protocols named BONJOUR, but I don't think it is necessary
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Jun 1, 2011
I want to use dhcpcd instead of dhclient on Ubuntu. The 'interfaces' man page say: "The dhcp Method This method may be used to obtain an address via DHCP with any of the tools: dhclient, pump, udhcpc, dhcpcd. (They have been listed in their order of precedence.)"
I can't find where to change this default order. I can uninstall dhcp3-client, but this will also remove ubuntu-minimal, which is not a good solution.
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Nov 5, 2010
I would like to use dhcpcd instead of dhclient in my Debian installation, because I had some trouble with dhclient in the past and I assume the problem is still exists now with some equipments.
So I would like to use dhcpcd, but I couldn't find a way to tell the system to give higher priority to dhcpcd than dhclient.
Also, I've tried to remove the package 'isc-dhcp-client', but it also would like to remove the following packages: isc-dhcp-client knm-runtime network-manager network-manager-kde
Moreover, it says no need the following packages anymore: usb-modeswitch dnsmasq-base libnm-util1 usb-modeswitch-data network-manager-ppp pptp-linux network-manager-openvpn libnm-glib-vpn1 libnm-glib2 modemmanager vpnc network-manager-vpnc
I would like to still be able to use kde-network-manager, because it is much easier to manage wifi connections using this interface.
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Jan 26, 2011
Is there any way to get an async notification (perhaps through something like a Linux message queue or Unix socket) when a DHCP client is either unable to renew its lease, or the address obtained changes from the previous value? I've got the ISC client and will dig into it to determine if it supports such a feature, but thought I'd ask here in parallel. (I'm trying to find out if there are any DHCP clients out there which already support this capability.)
If you're curious: We have an application where we're doing auto-registration of an IP camera to an external server. If the camera's dynamically assigned address changes, we need to restart the auto-reg state machine. I've seen implementations where a socket is opened and a SIOCGIFADDR ioctl used to fetch the IP addr, but I'd sure like to avoid polling like this if possible.
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May 11, 2010
I have a RHEL Machine. All I have is 5 Ethernet cards.I want all of them to be assigned IP through DHCP while I boot my system.
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Jul 23, 2009
I have Centos 5 installed on a PC in the local network. I have installed the RPM dhcpv6-client-1.0.10-16.el5.i386.rpm on this PC to configure it as DHCP V6 client. The RPM was installed successfully, and I have done modifications to the following files:
1. /etc/sysconfig/network, set the networking to yes.
2. /etc/sysconfig/network-scripts/ifcfg-eth1 set the BOOTPROTO=DHCP.
Now the problem is when I start the client on this pc as dhclient, it throws the following errors, and logs out after some time. All the network configurations were lost and the PC gets disconnected from the network.
[root@ServerB]# dhclient
Internet Systems Consortium DHCP Client V3.0.5-RedHat
Copyright 2004-2006 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
[Code]...
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Nov 24, 2010
I have a Lan with 100 computers with microsoft windows xp and vista on it, and I need to build a CentOS Primary domain control- PDC. So I am building a PDC , with samba 3.x +Ldap ( Light Directory Acess Protocol), with static eth0 and DHCP-server( Dynamic Host Control Protocol) on eth1.
Eth0 : 192.168.1.3
Eth1 : 192.168.1.5
Here is the configurations files:
== BEGIN uname -rmi ==
2.6.18-194.17.4.el5 x86_64 x86_64
== END uname -rmi ==
== BEGIN rpm -q centos-release ==
centos-release-5-5.el5.centos
== END rpm -q centos-release ==
== BEGIN cat /etc/redhat-release ==
CentOS release 5.5 (Final)
== END cat /etc/redhat-release ==
== BEGIN getenforce ==
Permissive
== END getenforce ==
== BEGIN rpm -q yum rpm python ==
yum-3.2.22-26.el5.centos
rpm-4.4.2.3-20.el5_5.1
python-2.4.3-27.el5
== END rpm -q yum rpm python ==
== BEGIN ifconfig -a == .....
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Apr 20, 2010
I have been trying to locate a good ftp client for an RHEL 5 server. The vsftp client has been locking up hard whenever there are slight network hiccups. Ideally we would like to look at something that works along side the vsftpd daemon. I had hoped that one of you could make some recommendations. This a 2.6.18-53.1.4.el5 kernel and we are running version 2.0.5-10.el5 of vsftpd, I have been looking around but cannot seem to find either a standalone client or a build that indicates that the bulid is compatible with RHEL 5.
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Apr 5, 2010
Where i can download Free Trial 30-60 (Eval) Redhat Enterprise Linux Client or Workstation Edition?I found only links to download RHEL Server.
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