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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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
76 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
610 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
45 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
3k 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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380 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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106 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
70 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
36 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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124 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
767 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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149 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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133 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
107 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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171 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 ...
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1answer
795 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
94 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
178 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
553 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
87 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
462 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
5k 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 ...
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0answers
364 views

name not resolve in vmware client PC

I have configured DNS server and DHCP sever on centos 6.2 vmware virtual machine. I have a windows xp vmware client machine. nslookup command is work in server terminal But it won't work in windows ...
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1answer
714 views

DHCP server with multiple scopes is issuing the wrong IPs to VLANs

We're restructuring our network, and configured our router/dhcp server as follows: # public internet connection auto eth0 iface eth0 inet static address 192.168.10.10 netmask 255.255.0.0 ...
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1answer
96 views

Connect another LAN to WAN port of Zywall 10w

Preamble: In my company we add a new Vodafone's router that's already compromised my working DHCP server. That's because Vodafone refuse to disable the DHCP server of their router. So I figure out ...
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1k views

dhclient not working at boot

Here's the problem: root@home:~# ping 8.8.8.8 connect: Network is unreachable root@home:~# dhclient eth0 RTNETLINK answers: File exists root@home:~# ping 8.8.8.8 PING 8.8.8.8 (8.8.8.8) 56(84) ...
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1answer
81 views

How to bridge two lan but keeping their clients using/choosing their own wan?

this is my first question here so please bear with me if I haven't made it super clear So I have 2 piece of Cisco RV180W router hardware. The office is moderately big and one single Wifi router is ...
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1answer
100 views

Access Control Lists & DHCP

Please take a look at this image right here. In the image above you can see a virtual netwerk simulation program (CISCO Packet Tracer 6.0) where I'm trying to setup a network and secure it. However ...
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1answer
278 views

DHCP server on bridged connection

I want to put DHCP server on Ubuntu server to listen on 10.0.0.1 (internal network). I also need to configure OpenVPN server on Ubuntu server (DHCP is going to lease addresses to OpenVPN clients), ...
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1answer
348 views

DHCP scope for a user class option

In Linux how can I set a DHCP server configuration which will lease IP addresses from scopes which are defined according to user classes. For example the following configuration leases IP addresses ...
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1answer
891 views

Per-client DNS servers with DNSMasq

I am running TomatoUSB with DNSMasq to provide DHCP and DNS services for my local network. What I would like to achieve is to provide alternative DNS servers for one or two specific clients on the ...
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1answer
137 views

How to configure a Windows Server 2008 along with a router?

I have network setup like the following diagram, how do I set the DHCP in server so that user can access Windows share and also access internet? [server]<========> ...
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137 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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2answers
1k views

Client DHCP on Linux seems to not be updating Windows AD DNS

I have an odd DNS issue that only sometimes presents itself. I have several Linux machines, running Ubuntu (10.10, 11.10, 12.04). Most of the time they work flawlessly. Sometimes, however, the ...
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1answer
161 views

What's the design rationale behind DHCP requiring two phase exchange, DHCPDISCOVER then DHCPREQUEST [closed]

RFC2131 section 3.1 describe the DHCP working flow as follows: Server Client Server (not selected) (selected) v v ...
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3answers
99 views

DHCP Reservation

I've been having problems with a few statements I've been reading. When setting up DHCP Reservation based on MAC addresses... Do the reserved IP's need to be in one of the scopes or not? Judging from ...
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3answers
9k views

PXE boot fails to get IP address via DHCP, but DHCP works when OS booted

I'm trying to PXE-boot a Cisco UCS C240 server to install a new OS over the network, but it isn't picking up an IP address via DHCP during boot. I get the "No DHCP or proxyDHCP offers were received" ...
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1answer
166 views

Windows Server 2003, DHCP: Address Pools and Reservations

I have inherited a DHCP server set up with a very small address pool and a number of reserved static addresses. Originally a small network, set up by non professionals, we are now running out of ...
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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
77 views

after changing hostname to FQDN router doesn't list my host? [closed]

my solution to sendmail errors in log: May 9 19:08:54 myhost sm-mta[17103]: unable to qualify my own domain name (myhost) -- using short name was to set hostname from myhost , to FQDN: ...
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3answers
1k views

How is DHCP request message broadcasted?

The broadcast address of DHCP request message is 255.255.255.255. Will this request message go through routers? It seems to be yes as the destination address is 255.255.255.255. However, it does not ...
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4answers
9k views

In a Win7 computer that belongs to a domain, how do I append DNS search list entries?

My desktop is part of the company domain and receives its IP address and DNS search list via DHCP. That's fine, of course. Is there a way that I can append additional entries to the end of the DNS ...
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266 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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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
36 views

Windows Server 2003 to provide DHCP to devices

I will use Windows Server 2003 to provide DHCP to devices like printers and other embedded device. Is it true that I need to buy a license ? Some one say to me that I need to buy call licenses for ...
2
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1answer
108 views

Is it possible? - Have multiple DHCP ranges in a single subnet

I have a testing environment of 10 lightly-populated racks. I'll be installing a single 1 Gb switch in each rack with 10 Gb uplinks to a single central switch. What I would like to have is for DHCP ...
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2answers
126 views

Duplicate IP on network and layer 2 devices caching

I have two identical VMs (Windows XP guests). I use KVM for the hypervisor. The first one is running, the second is a clone of the first not yet running. I edited the config for the second one to ...
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2answers
513 views

Separate WebBlocker settings, using one Watchguard XTM 505?

I support a school with 3 locations that uses a Watchguard XTM 505. They are implementing a BYOD wireless solution with Aerohive APs, and they will have 3 SSIDs (School, Guest, BYOD). Each SSID needs ...
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1answer
143 views

DHCP Server only remembering one lease

I have a Server 2008 R2 DHCP Failover Cluster that serves two VLANs - an office network and a guest WiFi network. Both of the members of the failover cluster are virtual machines (ESXi) and use the ...
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1answer
490 views

How do I access the internet without setting all clients to static IP's? Server 2012

I have a small business network using a server that runs Windows Server 2012. It is currently configured with the following roles: ADDS, HDCP, and DNS. The hierarchy is simple: A gateway/firewall, ...