0
votes
0answers
50 views

dhcpd log being flooded with duplicate and uid leases

I am runnig centos 6.4, isc-dhcpd-4.1.1-P1. I have over 100 desktop laptops on win7. my dhcpd.log file is being flooded with following messages Mar 3 11:08:06 tanaga dhcpd: DHCPREQUEST for ...
0
votes
1answer
44 views

How can I set one hostname and IP for multiple MACs in DHCPd (isc-dhcpd-4.1.1-P1) on CentOS 6.x?

I am trying to get my DHCP server (isc-dhcpd-4.1.1-P1) in CentOS to give the same IP and hostname to two different MAC addresses (LAN and WLAN) on the same computer depending on which is connected.. ...
0
votes
1answer
26 views

DHCPD: permanently leased IP being offered (twice) to random node and assignee

Greeting. On a small LAN (< 20 networked devices) with a cento6 5.9 server/dhcp-3.0.5-33.el5_9). I am configuring permanent leases thusly (dhcpd.conf, partial): range 10.115.64.60 ...
0
votes
0answers
115 views

CentOS DHCP server not updating DNS nameserver on Ubuntu Client

I have a working DHCP server on CentOS, with /etc/dhcp/dhcpd.conf set up as follows: subnet 192.168.1.0 netmask 255.255.255.0 { option routers 192.168.1.1; option subnet-mask 255.255.255.0; ...
0
votes
0answers
48 views

How to setup metric for routers on CentOS DHCP server

I have a simple DHCP server running on CentOS 6 with the following configuration: subnet 192.168.1.0 netmask 255.255.255.0 { allow booting; allow bootp; ddns-update-style none; range ...
1
vote
2answers
66 views

Centos TFTP boot server without a dhcpd server

Good Day, I want to ask the comunity if it is possible to setup a TFTP boot server without running a local dhcpd server on the local box? The setup currently looks like this? What is currently ...
0
votes
1answer
82 views

CentOS 5 domain-search from DHCP server ignored by dhclient

I have a DHCP server running ISC dhcpd which offers the option domain-search "domain.local"; option. This is being ignored by a particular CentOS 5 dhclient which is removing the search parameter in ...
0
votes
0answers
272 views

CentOS 6.4 - Cant get an IP from DHCP

I have a Ubuntu and CentOS system running on XenServer. The Ubuntu Box gets and IP from DHCP no problem. The CentOS will not take a DHCP but a static address works fine. [root@XenCentOS ~]# service ...
0
votes
1answer
70 views

Private DHCP through a switch using two eth interfaces?

Right now, I have an Scientific Linux blade connected to the internet on eth3, and connected to a 48 port Cisco switch on eth2. This Cisco switch is connected to the eth2 of 24 blank blades (which are ...
1
vote
1answer
33 views

Server connections not connecting when switching to Static IP

I have a Centos 6.4 based VM, and I'm running Virtualmin on it to host my personal site. The problem is that by default, the OS is using DHCP, even though at router level (virtual router defined ...
2
votes
1answer
130 views

What would cause the hostname FQDN to repeat the suffix twice?

I have three new CentOS 6 servers that connect to a DHCP server to get an IP and to have DNS/rDNS setup to bind their FQDN and IP. Two of them are behaving as expected. One of them is appending the ...
0
votes
1answer
43 views

Deploying Remote DHCP Servers [closed]

Please don't be too harsh. I'm quite new to the IT world and any advice/solutions would be greatly appreciated. Problem: I want to deploy Cent OS DHCP servers to different remote sites. This will ...
0
votes
2answers
2k views

Getting an IP from an ipv6 dhcp server

I have the following lab: DHCP SERVER [Centos 6] /etc/dhcp/dhcpd6.conf default-lease-time 2592000; preferred-lifetime 604800; option dhcp-renewal-time 3600; option dhcp-rebinding-time 7200; allow ...
0
votes
1answer
407 views

Disable LDAP service in CentOS 6.3

What command needed to disable LDAP service in CentOS 6.3. I tried: authconfig --disableldap but it doesn't work. I am trying to run ISC-DHCP in my machine but it always shows Not searching ...
1
vote
2answers
1k views

How to set hostname.domainname from dhcp

Running Centos 6.x using dhcp, we want to set the hostname to be FQDN that's obtained from a combination of dhcp options. As an example if I have two dhcp options option host-name "foobar"; option ...
1
vote
2answers
140 views

Cannot attach CentOS VMs via DHCP following router swap

I recently swapped out an old Netgear modem/wireless router and replaced with a ZyXel P660HW-T1 supplied by our ISP. I have configured it so that the new router has the same IP address, subnet mask, ...
0
votes
2answers
496 views

Switch sending DHCP packets to wrong VLAN

I have a basic remote site with a Cisco Catalyst 2924XL switch. There are 2 VLAN's at the site: 1 Default 2 Wireless There is a single server connected via a single ethernet cable, VLAN 1 is ...
-4
votes
1answer
241 views

start of dhcp failed on centos [closed]

i try to config DHCP on centos. when i start service by #service dhcpd restart it failed. the result of #tail -f /var/log/messages : Dec 31 19:26:31 localhost dhcpd: exiting. Dec 31 19:27:04 ...
3
votes
1answer
460 views

error in config DHCP on centos6

I was trying to configure DHCP on centos 6.my eth0 configuration is: [centos@localhost ~]$ cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE="eth0" BOOTPROTO="dhcp" HWADDR="00:0C:29:AE:62:BC" ...
0
votes
1answer
501 views

Determine the IP address of the DHCP server from a client machine

I would like to know what is the best way to get the DHCP server address from a client (linux based), who just got an IP address from the DHCP server? I searched and found this in most of the ...
3
votes
2answers
660 views

Basic networking: Centos Server Router + Ubuntu Client setup.. unable to access outside world from client

I am trying to set up my Centos Server with two NICs as a router. eth0 is connected to the outside world and eth1 is connected to an Ubuntu client. Here's eth0 on the server: DEVICE=eth0 ...
3
votes
3answers
6k views

Why is dhclient issuing a unicast DHCPREQUEST every ~15 seconds instead of at T1/T2 timers?

I am running a CentOS 6.2 server as my gateway and firewall, while also providing some internal services. This is a setup I have had for years using various hardware and distributions (redhat based). ...
0
votes
3answers
2k views

modify dhcpd.conf via script to convert whole subnet to DHCP reservations

We have a hodgepodge of systems that are either static IP addresses, or DHCP reservations. (We don't hand out any addresses except reserved ones). Some servers have multiple Nics, and ILO cards. Its ...
2
votes
4answers
2k views

resolv.conf after reboot on CentOS 5.5 EC2 instance

I'm having trouble getting my CentOS 5.5 EC2 instances (both i386 and x86_64) to properly populate resolv.conf after booting. No matter what I do, I end up with the default EC2 resolv.conf: ; ...
3
votes
3answers
6k views

Excessive DHCP requests in /var/log/messages: DHCPINFORM, DHCPACK and DHCPREQUEST repeated

I have a CentOS 5.5 system running DHCP for several subnets. In /var/log/messages, I'm seeing constant DHCPINFORM, DHCPACK and DHCPREQUEST messages. I don't understand why these requests are more ...
1
vote
4answers
4k views

How to resolve hostnames on my Windows / Linux network?

I've got a small business network. We have a few Windows machines, a Linux-based NAS box, and a Linux box on the network. Everything is connected to the Internet through a DSL router (Netopia 3000). ...
3
votes
4answers
4k views

Override DHCP hostname on RHEL5/CentOS/Amazon Linux

I'm running Amazon Linux (based on RHEL5) on EC2. I have my own domain name pointing to the instance's elastic IP. Amazon auto-assigns the instance a generic (and not visible on the Internet) ...
4
votes
4answers
2k views

Force Linux servers to automatically try to get an IP address if they lose it

We use static DHCP leases for our Linux servers on our small business network. Recently something bad happened to the DHCP server and all the linux servers ended up losing their IP addresses since ...
3
votes
2answers
1k views

Linux DHCPD Mac-Address based Groups

Our Current DHCPD.conf looks like the following. subnet 10.0.32.0 netmask 255.255.255.0 { range 10.0.32.100 10.0.32.254; option subnet-mask 255.255.255.0; option ...
0
votes
4answers
1k views

Problem Assigning Static IP to CentOS Server

We have a sandbox server running CentOS that we run inside our office. Our ISP has assigned us a block of 5 static IPs. We now want to assign it a static IP. DEVICE=eth0 BOOTPROTO=none # have also ...
0
votes
1answer
6k views

starting dhcpd failed (Centos)

i have a issue related to dhcp i have configured my dhcp according to my ip and all ... but it fails. when i try to start the service... i tried to trouble shoot and i stopped the firewall ...
2
votes
2answers
2k views

Static IPv4 and dynamic IPv6 on same interface

I am trying to set up a CentOS 5.4 box to use a static IPv4 address, while getting a dynamic IPv6 address at boot time. I have only one interface, apart from the loopback interface, eth0. It has a ...