DHCP stands for Dynamic Host Configuration Protocol and is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol.

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42 views

Cisco AP vlan setup

I have been racking my brain since last night and all morning with this problem...luckily it's not in a production environment yet. I have done many searches and have come up with the same responses ...
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1answer
178 views

How to assign multiple IPv6 addresses with DHCPv6 to a single interface?

This seems to be possible based on the spec rfc 3315 page 23: Excerpt: The configuration information in an IA consists of one or more IPv6 addresses along with the times T1 and T2 for the IA. See ...
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1answer
180 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 ...
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1answer
479 views

Centrally assigning DHCP “user class” to clients?

I'm using Windows Server 2003 along with MS's DHCP server. We're making some changes in our environment that we'd like to phase in - these changes will require a different default route, perhaps ...
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1answer
58 views

DHCP_HOSTNAME isn't working consistently in RedHat 7

Under RedHat/Centos 6.x I used DHCP_HOSTNAME=`hostname -s` in /etc/sysconfig/network-scripts/ifcfg-eth0 to pass client hostname to DHCP for registration in DNS and this worked flawlessly. I'm now ...
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845 views

Issue with RHEL7 and disabling NetworkManager

Okay community, let's see if we can figure this one out, cause I'm out of answers. Where I work I am setting up a bunch of RedHat Enterprise Linux servers. There is a collection of RHEL6 and RHEL7 ...
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1answer
267 views

Windows 2012 DHCP Failover: Scope refuses failover config Error: 20044

I have a scope configured on a Windows 2012 DHCP server (primary in a hot standby config) with two Cisco Vendor class options. I've added the Vendor class options, identically, to the standby server. ...
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546 views

Retrieving kickstart and other .img file in pxe remote installation in CentOS

I am trying to installation CentOS through pxe tftp installation. Installation starts but it fails to download image files from the http server. but file are accessible on the http server. Logs from ...
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26 views

DHCP frames (DISCOVER/REQUEST frames) have AutoIp address as source IPv4 address in Ipv4 header

In my TcpIp stack, I want to trigger AutoIp/LinkLocal and DHCP addresss assignemtn parellelly. But the response from the DHCP server is too slow. By the time I get a reponse from DHCP server the ...
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1answer
226 views

Windows Server 2008 DHCP: Lease offered, but not accepted

My Windows Server 2008 should be configured to work as a DHCP Server in the Network. Therefore I setup the Role and configured everything. I have downloaded a tiny tool, that can show DHCP-Offers on ...
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1answer
245 views

How do I configure an ASA 5505 to pull a DHCP address from a bridged DSL modem/router?

I have a remote office that I am hooking up to our corporate network and this particular site has a centurylink adsl2+ router that I need to negotiate an rfc 1483 via DHCP connection across. The dsl ...
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1answer
818 views

Understanding DHCPv6 Stateful Solicit message

I have been reading the full RFC 3315 and trying to generated spoofed nodes to ask for IPv6 address. (only for practice) Right now, I have a Ubuntu with wide-dhcpv6-server (the DHCPv6 server), one ...
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1answer
141 views

DHCP Server Issuing NAK when servicing multiple subnets

We currently have 3 VLANs setup in our network. On our DHCP server (Windows 2008) we have 3 scopes created for the 3 separate subnets. Our clients can't seem to pull addresses on the subnets, except ...
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1answer
37 views

iPads not showing signs of connection with wireless network

I have just started to work for London company which provides iPads for some typs of conferences within UK. Those iPads connect to our own wireless networks and pull out the data from the local ...
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1answer
1k views

Juniper SSG5 DHCP IP Pool is full. Unable to offer IP address to client

hope we have some Juniper guys around, I have configured a Juniper SSG5 as our main firewall/router the DHCP server set on interface bgroup1 to have a rang from 10.10.10.76 to 10.10.10.210 All ...
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1answer
135 views

Can I run 2 dhcp servers when I use predefined host entries?

I have a very specific setup of servers which netboot off a san. All of them provide identical functionality. There are no other machines in this netblock. Each machine boots from an iscsi image ...
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1answer
95 views

DNS, DHCP, FILESERVER transition from W2003 to W2008R2 DC's

We have a stable Windows 2003 Standard network. W2003 DC1 on x.x.x.10 - DC, DNS, DHCP, FILESERVER We are upgrading the network, and have a second server Windows 2008 R2 ready for insertion. ...
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1answer
390 views

two domains, one LAN, two DNS server, 3 problems

Background: we have 150 users using AD on domain ABC. Windows 2003. that serverDC1 has a DNS, DHCP roles, and there is serverDC2 which is its live DNS backup. logs seem healthy. then we chose to ...
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1answer
984 views

Client see Windows Deployment Services but still get “selected boot device failed” error

Like the title says I can't Windows Deployment Services working. The client laptop has an ethernet IP address of 10.0.4.94. On the secondary DHCP server I've set option 60 to PXEClient, option 66 to ...
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1answer
276 views

Check DHCP Option content

Is it possible DHCP client check the contents of an option ? I need provisioning a Linux server with DHCP option 140 (option-140). But the server behaves as if the DHCP did not contain the ...
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1answer
126 views

Is using wildcards for hostnames in dhcp module of dnsmasq possible?

I want to have all machines with a hostname that starts with foobar- assigned an IP from a specific range with an infinite lease. All other machines should have a volatile IP. I did the following but ...
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1answer
475 views

WINS Server interfering with DNS?

First of all, many apologies for my lack of knowledge in managing an active directory, but our network is a bit outdated and I don't necessarily have been trained in the field, however I'm the IT. We ...
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1answer
288 views

Hyper-V Test Bed for Forefront TMG 2010 Networking Issues

I am trying to set up a Server 2008 R2 test bed for a Forefront TMG 2010 deployment and I can't seem to get the networking configured correctly. The set up is as follows: Hyper-V Host has two NICs, ...
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1answer
355 views

Some clients aren't updating using dhcpd's “ddns-update-style interim” with Windows dns servers

I am using dhcpd 3.0.5 and Windows 2008 R2 for dns. I have "ddns-update-style interim;" set and the Windows server is set to allow unauthenticated updates. Most of the time this works great, but ...
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1answer
293 views

Server 2008 DHCP problem - Can't join a domain

I have just installed Server 2008 and have set up DHCP and it seems to be working fine, until you go to join a computer to the domain. It will allow you to type the credentials in to join the domain ...
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1answer
269 views

Is it possible to separate Routing/NAT in conjunction with an internal DNSMasq host providing DNS/DHCP?

It's really great letting DNSMasq take care of DHCP / DNS, as it "just knows" everything... as it should, considering it dished out the addresses to the hosts... However, it seems (to me) - ...
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1answer
587 views

Is it possible to run dhcpd3 as non-root user in a chroot jail?

I would like to run dhcpd3 from a chroot jail on Debian Lenny. At the moment, I can run it as root from my jail. Now I want to do this as non-root user (as "-u blah -t /path/to/jail" Bind option). ...
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1answer
404 views

Ubuntu server - Problem of routing

I have setup a Ubuntu server with Ubuntu Enterprise Cloud. The server is connected to a private LAN with DHCP and Internet access (via a gateway). At first, the server was working fine. It can ping ...
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1answer
218 views

Move sendmail from Fedora 1 to a different server ( fedora 12)

We have a sendmail server that also works as DHCP, DNS, and a gateway to our ISP. It has three network interfaces, one for our ISP ( static IP) and the other two is for LANS on different subnet. The ...
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1answer
133 views

Assigning security groups different ranges

Is it possible to assign a security group in windows 2008 a specific DHCP scope? Meaning, let's say we have 2 groups, employees and managers in the superscope Company. Assuming that each user is ...
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14 views

Windows Network Sharing - DHCP and Gateway pass through

I have several Windows 8 machines that are setup to do connection sharing over a wifi connection with switches behind a gigabit NIC. The devices behind the machines are Cisco phones and they are ...
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1answer
212 views

Server is assigned IP by GUID rather than MAC address in DHCP

I recently installed 8 new Dell PowerEdge c6220 II servers with dual 10G ports with CentOS 6. Each server has a DHCP reservation configured from a Microsoft 2003 DHCP server. I am using a Bootutil ...
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1answer
238 views

dnsmasq(as DHCP server) isn't working in KVM+libvirt envirmont

I'm using dnsmasq as DHCP server in VM environment. But It didn't working. I disabled basic DHCP feature in libvirt. <network> <name>default</name> ...
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1answer
82 views

How can I configure dhcpd to only update the reverse zone in bind?

I've got dhcpd pushing updates to bind, and it seems to be working fine: named[24161]: client 192.168.10.1#59141: signer "dhcp_updater" approved named[24161]: client 192.168.10.1#59141: updating zone ...
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1answer
128 views

Using isc-dhcp-server to allocate addresses from subnet different from server subnet

I'm trying to break my network into different subnets. Server is located into 192.168.15.0/24 subnet. I have the following declaration in my dhcp.conf: subnet 192.168.15.0 netmask 255.255.255.0 ...
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611 views

Windows DHCP client and DNS suffix search list (option 119)

I'm trying to supply the dns search list to my windows clients to make the internal DNS naming scheme usable. Windows AD is not used so no GPO available. The ideal way would be to supply the dns ...
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143 views

Clients suddenly stop receiving data from the network

I'm facing a connection problem on a small network: 10 clients connected to a Netgear WNR612v2 WiFi router with DHCP disabled; 4 clients connected to a Linksys WRT160NL router with DHCP active and ...
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217 views

Cisco ASA DHCP clients not routed

I got a Cisco ASA 5505 (8.4) , I got a Wap 200 sitting on a port as an AP. Sometimes (wireless) computers getting IP's from the ASA DHCP server cant get on the internet. Configuration looks like ...
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764 views

DHCPD Offering ip address on wrong subnet

I just recently added a new subnet for our wireless network to our DHCP configuration for the 192.168.254.0 subnet. Most of the time when wireless clients connect it works just fine. However, ...
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309 views

Linux Clients DNS records disappearing for Windows DNS Server

I have a bunch of linux servers. I have a Windows Server 2008 DC/DHCP/DNS server. The DHCP server is set to do authenticated updates to DNS, and it works well enough. When you renew DHCP on the ...
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183 views

Overriding DHCP scope option a single IP address reservation

Is it possible to override (or disable) scope option which adds entries to routing table of DHCP clients (option 121) for a single address reservation on Windows Server 2008 DHCP?
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211 views

SBS 2003 Routing and Remote Access switches back to DHCP on server restart. Why?

What am I missing here? I have RRAS set to a static address pool but whenever the server restarts it switches back to DHCP. DHCP is running on the server, but it is set to a different scope. As far ...
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0answers
103 views

DHCP and/or DNS server with dynamic 'upstream'

I have a Windows 2003 server acting as a DHCP server (among other things). I want the clients on the internal network to resolve addresses using DNS, but the problem is that the network is sometimes ...
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195 views

DHCP gives a 0.0.0.0 subnetmask

I have a fresh Windows 2008 domain with one DC (DHCP, AD, DNS, WDS). Everything worked fine yesterday at the implementation day, but this morning all hell broke loose. Some workstation coudn't ...
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478 views

How to make forward domain name updates work with ISC dhcpd and Windows clients?

We have ~100 Windows 7 clients and are running dhcpd 4.2.2. We're running two daemons, one for IPv4 (DHCP) and one for IPv6 (DHCPv6). IPv6 clients correctly register under ...
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193 views

Aironet, DHCP Reservations, & NACKs

I administrate a network that has 20+ Cisco Aironet 1200 series WAPs. They get a reserved IP from a Server 2008 R2 DHCP box. I have been seeing some weird traffic on the network, and have finally ...
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3k views

pfSense - simple DHCP relay configuration - how?

I am trying to figure out how I can have a machine on the "LAN" nic of pfSense get a DHCP address from a DHCP server on the "WAN" nic of pfSense (happens to be a Windows Server 2003 machine if that ...
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443 views

no dhcp or proxy offers were received

I have a new dell 780 optiplex machine,when i am trying to boot from network it is giving me error as no dhcp or proxy offers were received,I also have 20 odd machines of the same model but they are ...
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282 views

site-local dhcp option definition doesn't seem to work as documented

I'm trying to get my isc dhcp client (aka dhclient) to send a custom option to a server from an ubuntu 10.04 client. I started with an example from the dhcp-options(5). There, they say the only rule ...
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22 views

Is firewall blocking the ARP messages?

When a clients tries to boot via network (with PXE protocol), it fails with this message PXE-E11: ARP timeout PXE-E11: ARP timeout PXE-E38: TFTP cannot open connection dhcpd shows that it assigns ...