Server :: DHCP Doesn't Provide Fixed Addresses
Apr 9, 2010
Ubuntu LTS 8.04 + DHCP. Works fine except for fixed addresses. I mean all devices which need to get fixed IP according to their MACs don't get them and keep to receive random IPs from the range (although almost everytime all machines receive the same IP they got from DHCP for the first time).
The following config was created by Webmin interface.
At the one of the ubuntu forums i was advised to carry host description out of the subnet description.
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Apr 8, 2010
Ubuntu LTS 8.04 + DHCP. Works fine except for fixed addresses. I mean all devices which need to get fixed IP according to their MACs don't get them and keep to receive random IPs from the range (almost everytime all machines receive the same IP they got from DHCP for the first time).
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Jul 8, 2010
I want to set up a dhcp server such that the clients get same ip every time. Giving fixed address to every client would be a long process.
"I don't want to assign a specific ip to the client but what i want is the server provides same ip every time"
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Oct 20, 2010
I have a MacBook Pro running VirtualBox with Ubuntu 10.10 as a guest. I am trying to run a DHCP server from within the Ubuntu VM. I need to do this in order to run a multicast utility. On a stand alone machine running Fedcora I have this working without fail but within the Ubuntu VM I am having troubles. The DHCP server is starting okay, but when I use a cross over cable connected to a device the device does not ever get an address.I have eth1 bound to my ethernet jack where I am trying to source the addresses, and eth2 bound to my airport which is disabled unless I need internet access.Here is my DHCP.conf file
Code:
###############################################################################
# Amino Communications Sample dhcpd.conf file #
[code]....
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Sep 1, 2010
I'm new to Centos 5 (and Linux) and, after installing Centos, I configured Samba, Apche, ... w/o problems (through interactive interface). My problem is tha t I need to use DHCP (all our clients use dynamic IP addresses for the ease) but I don't find dhcpd ... nor the sample config file(s).
Note : the new server I intend to use is actually connected on a LAN with an 'old' DHCP server (still under W2K server), is this the reason why I can't find/activate dhcp on my new machine ???
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May 23, 2011
I would like have a password for accessing my web site which works fine. I also want for the specific site to allow access only for a specific range of ips. Right now the following config should forbid my access, as my ip is different from 200.200.200.*
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Apr 2, 2009
I want to provide dhcp in different NIC which are eth3 and eth2. eth2 has the IP address of 192.168.3.1 and eth3 has the IP address of 192.168.4.1. I want to provide dhcp to 192.168.3.0network and also for 192.168.4.0 network.All these are done in ubuntu server.
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Feb 3, 2011
For some time, I've had DSL and used Fixed-IP internally. I moved, no DSL, no cable, no nuthin' but dial-up and flaky cell-phone modem. Ugh. Along comes American Recovery and Reinvestment Act providing funding for making high-speed internet available to those of us in the boonies; no up-front or monthly equipment costs, affordable monthly changes, whoo-boy, that's for me. Installed, works, bada-boom, bada bing.
I have three servers, a network printer and a large format pen plotter that have all happily played together with fixed-IP for years connected via a Linksys BEFSR41 router and CAT-5 or CAT-6 cables and I do not want to screw around with DHCP (and the printer and plotter don't particularly like DHCP in any event). The servers talk to each other with SSH, their names and addresses are in /etc/host and all has been well with the world. DSL connected with PPPoE, HughesNet connects "automatically" to the modem with DHCP. I also have a switch available for additional LAN stuff as needed. Of course I had to do a hard reset of the router when setting up HugheNet (right back to infancy).
I do need to have DHCP enabled in the router for the limited occasions that a Winders thing gets connected to it (not my box, I don't mess with it).
Now, the actual question: is there any setting in the router that will enable fixed-IP, ignore DHCP leases unless the server is running DHCP (like a Winders box) and not bother me with screwy lease addresses that override my fixed-IP addresses? My servers are running Slackware 13.1, all configured with fixed-IP, all configured to "know" each other via /etc/hosts, /etc/resolv.conf has DNS Server address in it (and DHCP is not permitted to overwrite /etc/resolv.conf.
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Jun 7, 2010
I have a slackware server running ISC dhcpd and bind, and I want to give a dual boot XP / Ubuntu client a fixed address based on its MAC.
I added a host stanza to my server's dhcpd.conf:
Code:
I restarted bind and dhcpd, restarted the client's networking, and it still requests (and receives) its previously leased address, which is not the fixed address I want it to get. I tried dhclient -r to make the client release the old address, didn't help. On networking restart it still gets offered the old (wrong) address. Could it be that dhcpd somehow hangs on to the old lease even after the client sent a DHCPRELEASE?
How do I tell dhcpd to forget about an old lease, and how do I make dhcpd hand out the fixed address (and only that address) I specified for a given MAC, regardless of what the client requests?
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Jan 25, 2009
Assume I installed originally CentOS Desktop with IP receiving from DHCP server.Later I decided to assign a fixed IP to the local CentOS installation.How do I switch (permanently) the dynamic DHCP IP assignment to a fixed IP?
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Feb 20, 2009
When I install Fedora 10 on a new system, I let it default to DHCP. Later, I change the system to a fixed IP address by running system-config-network, selecting eth0, clicking on "Edit", clicking on "Statically set IP addresses:" and filling in the blanks. Is it possible to accomplish the same thing using commands that could be entered in a script? I assume one of them would be
Code:
ifconfig eth0 address XXX.XXX.XXX.XXX netmask 255.255.255.0
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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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Oct 25, 2009
I am using Ubuntu Server and would like to recieve an email once a day listing mac address's that have requested an ip address that are not in my list of known mac address's.
lookup=`grep $mac /root/dhcp.macs`
#This does not work as the first entry mac1 will be okay but mac2 and mac3 will not
#It will try to use mac2 as the file to look in which won't exist
#I need to make it loop through for each line of the variable and add that to the lookup value diff $mac $lookup
#I think this should differentiate known from unknown if i can get a lookup value
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Nov 22, 2008
A quick rundown of my equipment and plan for this particular machine.
SOYO P4I845PEISA Motherboard
Intel Pentium 4 2.0GHz Processor
512MB DDR333 RAM
ATI Radeon 8500 128mb AGP Video Card
Using onboard AC'97 Audio and Davicom NIC
Linksys BEFSR81 Wired Router
I am setting up a multiboot system with several OS's, multiple versions of Windows & several Linux distros. The main point of it all is just to have a system where I can load up a given version of Windows or Distro of Linux if I need to test something or show someone how something works.
The Problem:
5 versions of Windows installed, all hardware configured and functioning properly (including NIC) All Windows versions obtain DHCP IP addy with no problems.
Installed Red Hat Linux 9 (first of my linux distros) and it autoconfigured all of my hardware and has no problem getting an IP address.
Installed Fedora 8 and it could not obtain an IP address. I fiddled around with the network settings changing this and that, covered all of the options, and it had no effect. By this time I was irritated, so I just formatted and reinstalled the whole thing, which had no effect and resulted in the same problem. I decided to try it again, this time turning off my sound card and nic for the initial installation. After the initial install, I turned on the sound card and booted up to install it, then restarted, turning on the nic to install it. Fedora installed them both, and managed to get an IP address from my router.
I looked at the ifcfg-eth0 file and the only thing that was different from the previous installs was that a line reading "type=ethernet" (I believe thats what it said) was not there in the working install and had been before.
Puzzling and irritating, but Fedora was now working so I moved to the next distro on my list.
openSUSE 11.0
First install I tried the same thing I did with Fedora (turning off the NIC which did not work like it did in Fedora)
Second install, left all of my hardware enabled, and made it to the part where it asks to verify your internet connection. I clicked Test, and got this error:
Opening of Connection
eth0 device: Davicom Semiconductor, Inc. 21x4x DEC-Tulip Compatible 10/100 Ethernet (rev 40) DHCP Client is already running on eth0
I finished the install, and then got on another machine and I searched the net for this error, but could find nothing that specifically applied to my problem. I played around with the network settings, tried a couple of things that I had come across in my search (changed between tulip and dmfe, checked the box for "Request Broadcast Response", ran "service network restart" in Terminal) none of these had any effect.
The most irritating thing about this is that RHL9 had no problem with this whatsoever and it is badly dated, and the much newer distros are choking on it.
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Sep 6, 2010
Ive been trying to give certain clients an IP adres by mac adress. For this I use the folowing code:
host apex {
hardware ethernet 00:00:00:00:00:00;
fixed-address 192.168.250.100;
}
This works perfectly, however when I try to add a second client this way it doesnt. I tried to add the above code multiple times as a whole (2 times the above code) but that doesnt work. I also tried to just add more lines under host apex but this also doesnt work.
So my question is: How do I add more of this mac related IP adress assignments in the dhcp.conf?
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Jul 24, 2010
how to display status of assigned & free ip addresses in a DHCP range assuming that i am working on a DHCP server ?
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Nov 6, 2009
I'm looking for sm-notify, which should be part of nfs-utils, but isn't.
I need this for NFS over TCP failover. Where can i find it?
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Aug 25, 2011
I am trying to configure my IPv6 network. My computers are behind a Fedora gateway IPv6-configured, which is working great. But for computers inside my network, it seems I am getting only internal addresses from DHCP. Here is my ifconfig for an internal computer:
Quote: em1 Link encap:Ethernet HWaddr F4:6D:04:34:92:2B inet addr:192.168.0.184 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::f66d:4ff:fe34:922b/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:744250 errors:0 dropped:0 overruns:0 frame:0 TX packets:548987 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:841392242 (802.4 MiB) TX ytes:60384500 (57.5 MiB) Interrupt:18 Memory:f7100000-f7120000
he-ipv6 Link encap:IPv6-in-IPv4 inet6 addr: 2001:470:1c:611::3/64 Scope:Global inet6 addr: fe80::cea7:b778/128 Scope:Link UP POINTOPOINT RUNNING NOARP MTU:1480 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:61 dropped:0 overruns:0 carrier:61 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
[Code]....
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Aug 19, 2009
5.10 Breezy configured as machine controller. Works great eth0 is a fixed IP to communicate with controller comms board. Not easy at all to alter - the comms board is hard coded to listen on eth0 for commands.
I can use eth1 as the default gateway and ping google.com, etc. But when I now attempt to communicate with the controller with netcat, e.g.
Code: echo !HH | nc 192.168.1.6 80
I obviously never get an answer since the request is passed via eth1. Using the -g option with netcat doesn't work either. I had a look at iptables but it doesn't seem to be able to do what I want. How I can still use eth0 as my communication port to the controller whilst eth1 is the default gateway?
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Jan 12, 2011
I am trying to set up an unused machine as a web server for my students.
I originaly tried with Redhat 9 and had the same problems. I am using an HP Pentium 4 system with 2 network cards.
1) The built in Realtek RTL8139 configured as eth0.
2) An add in Broadcom BCM5782 Gigabit card that was added I presume when the built in card failed (we have a number of machines like this around the school), configured as eth1.
I did not realize the second card was installed when I had Red hat 9 on the system, but I discovered it after installing centos 5.5. I have tried to configure the system to use DHCP with and without getting the DNS from the provider, and both ways the system complains that there is no connection, check the cable, so it will not activate the device.
When I configure the device to use a fixed IP, I can configure the device, but I can't ping anything on the network other than myself. I suppose it is possible that both network cards have failed, but I get green link lights with both cards, when I connect them to my router, so I am at a loss as to why neither board seems to work. I don't have a spare network card to slide in because the computer takes a special mini card. Is there an easy way to test the board to see if the board is a problem?
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Aug 20, 2010
I have a problem with mediatomb. I installed it from official ubuntu repo and when someone is trying to get some audio files via UPnP there are visible only namefiles istead of title from tags. It strange because MediaTomb provides album covers from tags, but no album, genre or title. How do I configure that ? MediaTomb from repo has taglib support but no id3lib.
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Jan 23, 2011
I found a strange problem when I use gdb in eclipse to debug. When I step in the program, the register RIP(I'm using x86_64 machine and that's EIP in 32 bit mode) shows correctly but the line stepping in the source code may be far from the correct line. For example, when there is no loop in the source code, the RIP keeps on increasing and the current instruction pointer goes back to several lines back. I'm sure the source code is the right one because I when I checked the memory and local variables after several lines the values are all correct. The source code has many empty lines and does it matters with GDB?
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Feb 16, 2011
I'm having mysterious wired network problem with my Karmic/9.10 machine. It hasn't been in network a while, but now I finally got the cabling done. I can't get the IP from dhcp server (TW-EA510), and static settings doesn't work either. Fresh cabling showed OK 1Gb connection on tester, and win7 laptop works fine. I even tried with long cable though the rooms, but it doesn't help, so it definately isn't the new cabling.
Log from the router after issuing #"dhclient":
Feb 16 23:01:43 DHCP SERVER: DHCPDISCOVER from 00:01:29:fb:c5:d1 via br0
Feb 16 23:01:43 DHCP SERVER: DHCP offer to 00:01:29:fb:c5:d1
Feb 16 23:01:49 DHCP SERVER: DHCP request from 00:1b:ea:c8:a0:ba
Feb 16 23:01:49 DHCP SERVER: DHCP ack to 00:1b:ea:c8:a0:ba
Feb 16 23:01:54 DHCP SERVER: DHCPDISCOVER from 00:01:29:fb:c5:d1 via br0
Feb 16 23:01:54 DHCP SERVER: DHCP offer to 00:01:29:fb:c5:d1
Feb 16 23:02:03 DHCP SERVER: DHCPDISCOVER from 00:01:29:fb:c5:d1 via br0
[Code]....
Motherboard is some old Lanparty with two ethernet ports, NVidia CK804 and Marvell 88E800 rev 13 Gigabit netwok adapters, neither of them works. At least another of them has been worked earlier when I last got it wired. It's been a while, so I'm not sure which one of them and with different router if that matters.
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Jan 6, 2011
I am using KNetworkmanager-vpnc to VPN back to the office from home, the vpn connection works fine - for 15 minutes then I am disconnected. I am fairly certain that this is related to the Phase 1 key lifetime limit. The Knetworkmanager-vpnc GUI does not provide a location to enter this information. I think I found the config file that holds the connection information at /home/<user>/.kde/share/apps/networkmanagement/connections/ I just don't know the proper syntax to put in the file to specify a key life limit. Anyone out there know how to do this? I am using Fedora 14 x64 with knetworkmanager-vpnc 1.0.9-0.28.
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Jun 19, 2010
This works on my Slackware64 13.1 using KDE 4.4.4, Conky version 1.8.0. This is a simple .conkyrc tweak that doesn't need feh, it doesn't have the distracting faun shadow-border and most importantly, it doesn't disappear when you click your desktop (On my system anyway). These are the relevant sections to edit:
Code:
own_window_colour black
own_window_hints undecorated,below,sticky,skip_taskbar,skip_pager
own_window_transparent yes
own_window_argb_130
own_window_type override
own_window yes
I found that getting rid of the own_window_argb_values yes suggested in other fixes and replacing it with a specific alpha and then changing window type to override solved all my issues. I've noticed no bugs or strange happenings. This seems to be a common problem with a lot of workaround solutions. I think this is a much more elegant way. Edit: Not persistant... After 2 reboots it's back to normal.
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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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