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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Can't obtain ip-addres from my DHCP server

I can't obtain a ip-addres from my dhcp-server and it's going trough a firewall (pfsense), The firewall(pfsense) and DHCP server are two virtual machines on my physical server(ESXI). As rules i use ...
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1answer
84 views

DHCP server not assigning IPs - Linux (CentOS)

I am having a main issue with the DHCP server. It is not assigning IPs and the dhcp.leases file is increasing in size as it is logging multiple entries for same IP. Started and stopped the service ...
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2answers
99 views

I turned off server 2012 which host my dhcp server but computers on the network still getting ip addresses

I have a DHCP server installed on Win Server 2012 which is turned off right now, but my computers still can establish online connections with the IPs previously received from the DHCP server. I tried ...
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2answers
40 views

Avoid connect 2nd DHCPs on 1 LAN [closed]

I have a LAN network using Draytek 2910 with DHCP. The network goes through 20 different rooms. At first everything is working good. Suddendly the network keep losing IP addresses every 30 t0 60 ...
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 ...
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1answer
862 views

Debian hangs on startup (NFS Common utilities: statd)

I am trying to configure my debian 6 machine to use DHCP. I have modified the /etc/network/interfaces to only contain: auto eth0 iface eth0 inet dhcp But when I reboot it hang at NFS Common ...
2
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1answer
471 views

determining gateway ip in dhcp server in case of relay agent existence

I've got a situation where i have two subnets. (Say subnet 1 and subnet 2). ` My DHCP Client is configured inside subnet 1 (net id : network id 10.1.1.0) My DHCP Server is configured ...
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1answer
2k views

Configure DHCPD with assigned IP address and gateway on different subnets for KVM [closed]

I have a dedi with an IP range of 123.123.123.1/24, the problem is the gateway address: 111.111.111.254 and it's on completely different subnet. I have already setup a bridge and KVM virtualization. ...
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1answer
1k views

Can I see DHCP options on my network from a windows client? [closed]

Is there anyway to see the DHCP options configured on the server from a windows client (win 7) with no login / admin access to the server?
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2answers
3k views

Inconsistent dynamic DNS update behavior

After having upgraded a Windows Server 2003 Active Directory Domain to Server 2008, and upgraded client PCs from Windows XP to Windows 7, I'm seeing inconsistent dynamic DNS update behaviour. Two ...
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1answer
36 views

AD Server Connection Probem

Ok so i have a Linux server handling the DHCP, and FTP server i have and Network Shares. Then i have a Server (Windows R2) with just the AD. None of the client computers can connect to the Domain. The ...
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1answer
167 views

DHCP-defined local DNS address isn't responding [closed]

I set up a bind DNS server on 10.0.0.2 on my network. named.conf looks like this: options { directory "/var/named"; pid-file "/run/named/named.pid"; auth-nxdomain yes; ...
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1answer
91 views

Trying to install new wifi router, continually losing its gateway, sometimes crashing entire network [closed]

So, I'm trying to set up a buffalo router with dd-wrt loaded stock, If I leave the settings alone, the router loses its default gateway each time, and the router admin back-end is never accessible ...
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vote
1answer
255 views

How do I resubnet my network [duplicate]

Our DHCP is running out of addresses. I cannot extend the range and would like to resubnet. Right now our addresses are: 10.1.24.1-254 255.255.255.0 Would I change the subnet to 255.255.254.0 ? ...
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1answer
89 views

Client doesn't get new IP when switching between subnets/locations

So here is our setup. We have 14 locations each with its own subnet and router. The routers at these locations have DHCP relay enabled that points back to our central server that is running DHCP. ...
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votes
2answers
976 views

Domain Computers cannot access internet [closed]

I have my own domain that i created not so long ago and i'm just now setting it up. I've been having some problems even from the past on my practice domains. None of the domain or any computers that ...
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1answer
508 views

Cannot ping gateway

I replaced my aging fileserver with a new server running ESXi 5.1 and migrated my fileserver in a virtual machine running on it. Now I have the following problem with this VM: I'm getting the ...
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1answer
322 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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2answers
1k views

Using a Cisco ASA 5505 to forward PXE (WDS) Requests

I have a Cisco ASA 5505 that uses around 5 NICS for different networks. Currently I'm using my ASA to route traffic as it's the only Cisco device I have capable of the small amount of routing ...
2
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0answers
193 views

Why is qemu issuing a DHCP discover after it receives a DHCP offer

I'm having some trouble seting up network on qemu. I'm trying the easy option (user). The qemu command I run is this: ./qemu-xilinx/arm-softmmu/qemu-system-arm \ -M xilinx-zynq-a9 -m 1024 ...
2
votes
1answer
702 views

DHCP failover with isc-dhcp-server using two secondary servers

I'm rearranging our network and putting some DHCP failover since we have a lot of machines, and even servers, getting IP addresses with DHCP. Today we have a nice DNS topology with one master server ...
2
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1answer
273 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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2answers
96 views

How can I get a 2nd IP adress from a DHCP-server

If i use static IP adresses i can use more then one per network card, for exemple i can set eth0 to use 192.168.0.1 and eth0:1 to use 192.168.1.1. And if eth1 get a ip-adress over dhcp, can i somehow ...
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0answers
38 views

Modems unable to acquire dhcp IPs

I work at an ISP where we use routers (7200) for dhcp. I recently reloaded one of our dhcp routers because we had complaints from many users unable to connect and the dhcp database file it was ...
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2answers
74 views

Why APIPA doesn't work with multiple network adapters? [closed]

I connected 3 cameras to 3 network adapters in my PC. I don't have DHCP, so I thought APIPA will do the work. But, camera's installation guide says "If a PC is equipped with multiple network adapters, ...
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1answer
49 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 ...
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2answers
204 views

dhcpcd on debian wheezy doesn't seem to be considering /etc/resolv.conf{head|tail}

I have set up an amazon EC2 instance (with a debian wheezy AMI) having minimal stuff on it, and dhcpcd is present by default. dhcpcd doesn't seem to be considering /etc/resolv.conf.head or ...
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votes
2answers
151 views

DHCP/static IP nomenclature

I've just inherited systems administration for a small network, on which we have exclusive access to the first 128 IPs on a private virtual subnet. We have a DHCP server which binds IP addresses to ...
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1answer
197 views

HyperV Migration and DHCP Reservation

In my company network we've 2 HyperV-2012 host with DAS, every server has a DHCP reservation in the DHCP server (windows server 2008). Yesterday we've migrated (using shared with nothing migration) ...
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2answers
78 views

Access switch management on network without dhcp

Could not find default IP of cisco router which was static. Issue is now solved see answer below :)
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0answers
692 views

How to config libvirt network setting about disabling dnsmasq “except-interface=lo”?

Here is the thing. My VMs run with libvirt and use default network libvirt-provide, and I've mad each VM registers its hostname to dnsmasq set by libvirt. so I want to look up its hostname for ...
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1answer
48 views

Peer domain not authenticating users

I have a forest with two DCs, one of which was added as a peer to the original DC. One DC is running Windows Server 2008 and the other is running Windows Server 2008 R2. I can see on both servers ...
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4answers
4k views

Computer gets IP from DHCP server but has no internet connection

I've installed an isc-dhcp-server on Ubuntu 12.10 and I'm trying to setup a DHCP server on a head node for six worker computers in the local network. The head node itself is a DHCP client receiving ...
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0answers
510 views

ip-helper forwarded DHCP request not reaching DHCP server

The situation--I'm trying to centralize our DHCP services to a single Windows 2008 R2 Server (we're switching to L3 switches that don't provide DHCP services). We currently have Cisco routers at ...
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0answers
126 views

ntp.conf being rewritten in Fedora

Something rewrites my ntp.conf on reboot. It's easy to google that DHCP client may do it, and there is a simple solution for that. Just including -N option into dhcpcd_eth in /etc/conf.d/net should be ...
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1answer
101 views

Configure router in network with Windows based DHCP

I am wanting to use my Server 2012 machine for DHCP. Once I add the DHCP role, what should my router be configured for? I have a cable modem bringing the internet in. Would the server replace my ...
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2answers
39 views

DNS reverting in Windows Server 2003

I have a Windows Server 2003. It is connected to a number of networked databases but stopped working this morning. It was receiving DNS from an old DC which we have just retired. I tried to change the ...
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0answers
132 views

How does DNS update work in an environment where DHCP performs registration, and clients may have multiple DHCP leases?

Here are the particulars (all Windows): DNS - Our DNS only stores one A-Record per hostname. Scavenging is not currently enabled. DHCP - DHCP is configured (server level) to perform DNS registration ...
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1answer
1k views

Wyse DHCP Option Tag

I have a new Wyse R10L that I am testing, and I have found a tutorial video for configuring it on my network (a test Server 2012 environment). The instructions say to "set a DHCP option tag 161" to a ...
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1answer
156 views

DHCP IPv6 and vendor-encapsulated-options

I was using this option on ipv4 to send some information to the host. On my host lease I have something like: supersede vendor-encapsulated-options = "MY INFORMATION"; On the DHCP client host I can ...
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1answer
162 views

DHCP: DHCPREQUEST issues

Maybe someone that knows more about DHCP and network that can help me out with this one. I've been thrown for a look with this for awhile now, so I'm reaching out to the ServerFault community. We ...
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2answers
117 views

How to connect two wireless routers by powerlines [closed]

To extend the wireless range I bought a pair of powerlines. So one of them is connected to the main wireless router which is provided by ISP company. And the other side of the powerline is connected ...
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0answers
186 views

Configuring HP Proliant iLO using hponcfg

I am configuring an iLO using hponcfg by logging into the machine remotely and running hponcfg with scripts Mod_Directory.xml and then with Mod_Network.xml. I am enabling the DHCP on the device. But ...
2
votes
1answer
978 views

Microsoft Windows DHCP: Steering IPv4 clients into specific scopes based on MAC

We have visitors on our campus who bring their own laptops and devices and use our wireless and wired networks. When we receive a copyright infringement notice (typically BitTorrenting), we are ...
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1answer
112 views

What file transfer protocols can be used for PXE booting besides TFTP?

According to ISC's dhcpd manpage: The filename statement filename "filename"; The filename statement can be used to specify the name of the initial boot file which is to be loaded ...
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1answer
219 views

Why use FQDN as DNS-server option in DHCP?

I've seen multiple default configurations of DHCP-servers with a FQDN set as the DNS-server option. Doesn't this imply a catch-22, or the need for that DNS-server to be in the hosts file of every ...
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1answer
1k views

Why does DHCP have fixed client and server port numbers

In most client-server-applications, the port number of a server is a well-known number, while the client uses a currently available port number. DHCP is different. Here, both the client and the server ...
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0answers
106 views

Checking Statement of Health (NAP) info on Linux using Dhcp and Radius

I have a Linux DHCP server and windows clients. I want my DHCP server to assign an IP address from a network let's say 10.6.3.0/255.255.255.128 if the client has it's firewall enabled or an IP address ...
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3answers
663 views

How to query specific DHCP server

is there a way how to query a specific DHCP server for an IP address? Something similar to dig @_IP_ADDRESS_ _server_name dig @8.8.8.8 apple.com Thanks
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2answers
6k 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 ...