Red Hat :: DHCPD Server With Decreased IPs Range

May 9, 2011

I have a RHEL 5 64bits installed on a virtual server. I set up a a dhcpd server for one subnet last week and I have a strange behavior : the IPs are provided in a decreasing order. What's the? So I have tried to exchange range values but the result remains the same.

Package version installed :
yum info dhcp
Installed Packages
Name : dhcp
Arch : x86_64
Epoch : 12
Version : 3.0.5
Release : 23.el5_6.4
Size : 2.2 M
Repo : installed
Summary : DHCP (Dynamic Host Configuration Protocol) server and relay agent
License : distributable

Here's the dhcpd.conf :
ddns-update-style none;
#autorisation du pxe
allow bootp;
allow booting;
authoritative;
log-facility local7; .....

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Jan 11, 2010

Is there any way to associate a group to subnet in dhcpd.conf? I want hosts in a specific group to be locked to an IP range defined in subnet. Something like this:

Code:
authoritative;
ddns-update-style ad-hoc;
subnet 192.168.0.0 netmask 255.255.255.0 {
range 192.168.0.1 192.168.0.100;
option blah1;

[Code]...

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Jun 20, 2011

I've found a lot of pages of how to fix the issue on older releases of dhcpd and ubuntu.

#>dhcpd
#> ...
#> Can't create PID file /var/run/dhcpd.pid: Permission denied.

I have tried creating the file and giving it permissions to be accessed, but that isn't solving the issue. I tried to go through some of the older fixes, and one was really close to working but lacked the same folders as I have.

EDIT: one solution that worked was to use ln -s /var/run/dhcp3-server/dhcpd.pid /var/run/dhcpd.pid dhcpd3 -cf /etc/dhcp3/dhcpd.conf at0

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I run lxde ....

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Apr 13, 2010

it appears i haven't quite grasped the meaning of dhcpd.conf despite the numerous tutorials i went through in the internet and the detailed read of dhcpd.conf that i did. what i basically want to put you in perspective, is to have all the pc's in my home network (desktops and laptops) regardless of any other settings, to send their computer name (hstname basically) to the dhcpd (during the handshake)... then the dhcpd will use that name as the hostname and append the known domain name, thus creating an entry (an A record and a PTR record) in BIND....

so say a laptop comes into wifi range of the domain "myhome.org."... i take it that during handshake, the laptop will send its hostname (i don't know what that will be for winXP and win7 dhcp clients, but i presume it will send the output of command 'hostname' for linux clients - or at least thats what i would like it to send....).say "nass-notebook" Then the server will append "myhome.org." and it will update the DNS with an entry looking like[URL].. corresponding to some ip address.

[Code]...

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Jun 8, 2010

I am trying to provide dynamic IP addresses for devices that are on a different VLAN (101). The server is currently providing 172.17.x.x/16 range for its own VLAN (417). My server is RHEL4 and DHCPD is version 3.0.1. The core switch (Cisco 3750) is configured with ip-helper on VLAN 101 interfacce. Here is my dhcpd.conf file:

authoritative;
ddns-update-style ad-hoc;
omapi-port 7911;
shared-network eth1

[code].....

However my laptop on the VLAN 101 keeps getting IP of 172.17.x.x/16 range..

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Jun 22, 2010

I just did an update and now my screen resolution is down to 1024x768 from 1280x1024. I tried to change it using the System->Preferences->Monitor menu item, but it is already set to the max it allows. I noticed that the monitor is unknown and hitting Detect monitors doesn't change anything.

Here is my graphics controller:

[root@nc1lt6812a ~]# lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation 82Q35 Express Integrated Graphics Controller (rev 02)

The monitor is a Planar PL1910M.

My intel drivers rpm:

[root@nc1lt6812a ~]# rpm -qa | grep intel
xorg-x11-drv-intel-2.11.0-4.fc13.i686
The rpms that were installed:
[root@nc1lt6812a ~]# rpm -qa --last | grep '22 Jun'
vim-X11-7.2.411-1.fc13 Tue 22 Jun 2010 06:22:40 PM EDT
policycoreutils-python-2.0.82-31.fc13 Tue 22 Jun 2010 05:47:08 PM EDT

[Code]....

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Jul 22, 2010

I have setup a dhcpd server on my lan with the following option to reflect the static route to my private LAN.

dhcpd.conf

Code:
option static-routes 10.0.0.0 192.16.5.0

I've tested it on OpenSUSE, ArchLinux and even Windows dhcp clients and they've managed to pull the static route configuration. However, to my suprise on my ubuntu machines this doesn't seem to load. Is there anything that needs to be done on the client's side to get this to work?

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[Code]...

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May 10, 2011

I've a question about how work dhcpd. I'm on CentOS 5.6. I has a dhcpd server on it. His configuration:

authoritative;
ddns-update-style none;
deny declines;
deny bootp;

option domain-name "mydomain.domain";
option domain-name-servers IP;
option routers IP;
option time-offset -18000;
#option ntp-servers IP;

subnet IP netmask MASK {
range IP START IP END ;
default-lease-time 86400;
max-lease-time 172800; }

And now in the /var/lib/dhcpd/dhcpd.lease file, there few entrie for the same IP. Sometime I've ten same entries for the same IP. Can I have only one entrie by IP? Is there any problems in my configuration of my dhcpd.conf file?

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But I can install other package like bind dhcpd etc.

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Aug 9, 2011

I've been using dhcpd for address assignments to PCs for a very long time with no issues. I recently upgraded from lenny to squeeze and now dhcpd seems to have new behavior which I can't seem to change. Here's what I want to do. First, I have a simple situation and don't want to get involved with dynamic DNS updates. I have host statements for each of my PCs and a range statement for cases where I install a new device and don't yet have a host statement for it. Previously, I could discover the ethernet address for the new device from the dhcpd log and add a host statement with an address of my choosing for the new device.

I'd then restart dhcpd and do something like reboot the device or issue an ipconfig /renew statement on the new PC. What would happen is that the old dynamically assigned IP address would be NAKed and the device would do a DHCPDISCOVER, etc. and get the new IP address I specified in the dhcpd.conf host statement. In squeeze, this no longer works. The client asks for the old address it got dynamically and the server just says yes. I can't seem to find a way to get it to NAK the dynamic address and use the new address I've specified in the host statement. I'd appreciate any enlightenment on how this is now supposed to be done. Here's my simplified dhcpd.conf file:

authoritative;
log-facility daemon;
ddns-update-style none;

[code]....

Note that the address here was assigned based on a previous range statement and isn't consistent with the above config file.

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I have a dhcpd server running CentOS and Webmin. I noticed in my lists of expired leases some of the lease times are only a few hours even thought I have lease length set to 1 week. I want to keep a lease for a week even if the device requests that it be expired. Is there some way I can do this in dhcpd? I am attaching a screenshot of some of my lease times listed in Webmin.

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I would like to make my Fedora 13 box a DHCP server for my network. I can not find dhcpd in YUM. Is there a way to make my Fedora box a dhcp server? This was relay easy with Suse, but my Opensuse box just suffered a hard drive failure.

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Apr 24, 2011

I want to plot a set of data in only one plot.The problem is that some points of the data should be better plotted in a linear scale (lets say 0 to 100,000) but there are other data points that, exceding the value 100,000, would be better plotted in a logarithmic scale, as they goes in the range 100,000 to 500,000,000. Let's say the data is:

Code:

X Y
0 100
10000 80
20000 75

[code]....

Is there a way to plot all these points in the same plot in only one X-axis showing two different ranges in that axis: linear: 0-100,000 logarithmic: 100,000 - 1,000,000,000?The axis would be read, for example, as:

Code:
|-----|-----|-----|-----|-----|-----|-----|-----|-----|
0 20k 40k 60k 80k 100k 1M 10M 100M 1G

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I want to build a bash script, which can ping a range IP adresses which will be filled in by the admin. If there is no IP-adress filled in, then the script must ping the subnet where the system is logged on. So if my ip is 192.168.1.6, then the script must ping from 192.168.1.1 till 192.168.1.255 Or else, if there is given a beginning and ending ip it must ping that!

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read begin
echo "Enter ending IP-adres:"
read end
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#!/bin/bash
ifconfig | grep 'inet addr:' | grep -v '127.0.0.1' |
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I hv Cent OS 5.3 installed as server. I hv a network of approx 100 desktops and laptops. For a security purpose i want to block certain laptops from gaining a the network access using dhcp. Can we block the ip address leasing if a specific MAC address request for a ip lease?

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I have setup a CentOS 5.5 server as a DHCP server. That will be it's only task in a Cisco callmanger VoIP environment The DHCP server that comes with CentOS 5.5 is from ISC V3.0.5 -redhat.

The server (HP DL360) has two physical NIC's of which only NIC1 is used (ETH0)

ifconfig shows:

Code:

The interface has a fixed IP setup.

My dhcp.conf file looks like this:

Code:

When I start (try to) dhcpd via the service interface or via the prompt as

Code: service dhcpd start

I get an [FAILED] message and the following is in /var/log/messages

Code:

But when I start the DHCPD on the comamnd prompt in debug mode it looks as follows:

Code:

and /var/log/messages shows:

Code:

Why does the system ask a declaration for eth0 0.0.0.0?

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I'm configuring a new Centos 5.5 server in replacement of an old W2K server.The topology of our network is simple : one file/dhcp/dns relay server and workstations (PC's and some MAC's) plus network printers and scanners.All the workstations have dynamic IP addresses (easier because a lot of 'dynamic' changes : new persons with their own laptop, ...) and the server and printers/scanners have fixed IP addresses.I edited the dhcpd.conf (see here underneath), I have the file dhcpd.leases but it doesn't start !

DHCPD.CONF
ddns-update-style interim;
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[code].....

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Up to this, no problem yet. The problem is this:

I tried the following from the 192.168.15.* range:

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Now I tried all of this from the 192.168.16.* range as well. Everything checked out except for one tiny crucial thing. I'm not allowed to upload files, I get "550 Requested action not permitted". I login under the same user I've verified I get the correct directory listing, so absolutely everything checks out to be the exact same.

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I installed dhcpd using:

Code:

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Code:

The error was:

I changed permissions to 777:

Code:

To no avail!

It's got something to do with AppArmor.

I don't think it is installed on this system:

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