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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39 views

Prevent Windows Server 2012 from using DHCP-provided default gateway?

How can I prevent Windows Server 2012's local network connection from using the default gateway provided by a DHCP server? I do not control the DHCP server so the solution must be implemented on the ...
2
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1answer
168 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
257 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 ...
2
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1answer
2k 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 ...
2
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1answer
272 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
499 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
13 views

AD Dynamic DNS not working with Linux IPv6

I have an AD DNS/DHCP enabled server. I have mixed Windows and Linux machines/servers. IPv4 is working great with DNS/DHCP, even for the Linux systems. IPv6 is working great except that it won't ...
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1answer
150 views

Cleanup DHCPD leases as well as DDNS Entries

I have a fairly simple set up on a Debian server I'm running. I currently have isc-dhcp-server installed along with bind9. I set up my zone and my reverse lookup zones and set up dynamic updates, it's ...
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1answer
550 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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1answer
176 views

Configure OpenNebula to use DHCP

I'm trying to configure OpenNebula to use the DHCP server that already exists on my network. Yes, I already know that OpenNebula manages virtual mac addresses rather than IP addresses, but that ...
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1answer
3k 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
644 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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1answer
1k 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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1answer
39 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
430 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
585 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
81 views

Multiple DNS mappings for a host via DDNS

I have a network in which DNS is automatically updated with a record for hosts when they get an address via DHCP (isc-dhcp-server & Bind configured with DDNS updates). The DHCP server is ...
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1answer
319 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
41 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
141 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
107 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
657 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
1k 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
476 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
137 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
579 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
372 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
456 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
2k views

ISC DHCP fails to sync leases between peers

I use ISC DHCP version 4.1.1 on Debian GNU/Linux on both servers. I tried to solve the following problem using various versions of ISC DHCP but it remained the same. My configuration for failover ...
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1answer
304 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
288 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
667 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
408 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
228 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
135 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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1answer
22 views

How can a dhcp client in linux can send the dhcp option 60 - specifying the vendor-id?

I am using fedora core machine. My linux- fedora core machine - client wants to send the dhcp option 60 specifying the vendor id to the dhcp server. Next, I want to read the dhcp option 43 send by the ...
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1answer
45 views

Excessive DNS Update requests

I have a curious situation and I can't find any good reason why its happening. Its not causing any noticeable problems, just something I'd like to resolve. From my Server12 dhcp logs, these entries ...
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1answer
86 views

How can I block all traffic to/from an bridged interface while allowing DHCP?

I have a PC (running Fedora 20) that is being used as a "software switch" to control the network connectivity of some external devices. There are eight such devices; the PC has two 4-port Ethernet ...
0
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1answer
37 views

How can I implement DHCP so that all users on a domain can get one pool of addresses and the rest get another?

For example, having the domain users/machines on the 192.168.22.x subnet and the rest of the non-domain users and machines are on say, the 192.168.30.x subnet. I'm running Windows Server 2008 and the ...
0
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1answer
324 views

Foreman errors out when provisioning using an ms-dhcp/dns smart proxy

Im running foreman, with smart-proxy on a win2k12 r2 box running ad/dhcp/dns. When i try to provision smart proxy dumps this to the logs: Changed the current scope context to 192.168.20.0 scope. ...
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1answer
297 views

CentOS: DHCP Server and DHCP relay on same machine

eth0 IP: 192.168.1.100 Alias interface eth0:dhcp IP: 10.10.1.100 dhcpd.conf: authoritative; local-address 10.10.1.100; subnet 10.10.1.0 netmask 255.255.255.0 { range 10.10.1.10 10.10.1.50; ...
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1answer
81 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 ...
0
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1answer
554 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
860 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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200 views

Create a DHCP working lab in HyperV (2012) all Internal

I need to create a lab for testing purposes. I got a good desktop on which i have installed a server 2012. In HypverV, i have installed two 2012, one XP and one W8. The idea is that the one and ...
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308 views

How to filter out/disable DHCP NAK responses?

We have some crappy situation where we don't have control over the existing DHCP server on the network and where we need to add another BOOTP/DHCP server with the authoritative directive. Our ...
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160 views

DHCP requests don't get to instance, but they do if I retransmit with scapy

Trying to troubleshoot a problem where DHCP request packets aren't getting into a KVM virtual machine. The DHCP server and the hypervisor are on separate machines, separated by a swich. br100 ...
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1k 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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169 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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40 views

ProxMox Internal DHCP

I'm currently searching for a solution to automate a "cloud" network routing. My hosting company offers me additional IP's for my VPS systems on my Proxmox host and I want to allocate them ...