Dynamic Host Configuration Protocol (DHCP)

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2
votes
4answers
2k views

Is a short DHCP lease from my ISP likely to cause problems?

I'm wondering if having a short DHCP lease is likely to cause any issues, such as: Dropped VoIP calls Dropped VPN connections If so, could you explain why?
0
votes
1answer
1k views

DHCP Post-Install configuration wizard hangs

I'm attempting to set up a Windows 2012 Active Directory demo environment on a Hyper-V VM, but when I run the DHCP Post-Install configuration wizard to authorize the DHCP server in AD DS, the wizard ...
1
vote
1answer
7k views

Setting up routing in CentOS 6.4 as a router/DHCP server with two nics

I am stumped about how to setup centOS 6.4 to route packets. |Local Network| -eth0- |CentOS 6.4 box| -eth1- |Internet| The centOS box has a dhcp server running. Currently it is handing out IP ...
0
votes
1answer
877 views

VSphere 5.1 DHCP Server VM routing

I am trying to setup the routing for a VM that is my firewall/dhcp server. I have 3 VMs: router/firewall (centOS) -> VM1 unRAID(unraid) -> VM2 download-server(ubuntu server) -> VM3 2 NICs vmnic0 ...
4
votes
1answer
912 views

DHCPREQUEST and DHCPACK spam in logs

I've recently noticed that my android phone (droid dna, although the thunderbolt that I had before did the same exact thing) is rapidly requesting dhcp info my dhcp server (isc-dhcp-server on debian ...
0
votes
1answer
2k views

deny unknown-clients dhcpd.conf

I'm having troubles figuring out how to set up my dhcpd.conf. I am rather new to this. I want to allow booting and only allow the clients listed below to get their fixed address. I do not know how to ...
-1
votes
1answer
115 views

DHCP messages in LAN [closed]

I run a Mac and release/renew my IP with: sudo ipconfig set en0 DHCP In wireshark I get the following with udp.port==67 as filter: Why are the messages sent from my computer broadcasted, but ...
1
vote
1answer
273 views

How to override the network DHCP Server settings to be specific to my own .conf file?

Basically, I have want to test out WPAD(Web Proxy Autodiscovery Protocol ) , PAC. But I would like to do it without touching the Network DHCP server. So, can you suggest a way in which I can achieve ...
1
vote
0answers
125 views

DHCP Requests out of line with lease time, inordinate amount of requests to server

Environment contains an OS X 10.6.8 Server with OS X 10.8.2 clients. DHCP is running on server with a lease time of 1 Day (86400 seconds). The system log is flooded with DHCP REQUEST/ACH messages ...
0
votes
1answer
2k views

Cannot find the DHCP Server

The network was fine yesterday and as far as I know nothing has been changed or added. This morning some computers are connected to our domain but most of them are reporting limited connectivity. On ...
-1
votes
1answer
3k views

Windows Server 2012 AD DC/DNS/DHCP in single server

I have to say I am not a system admin but I had to setup the development environment in my company and I ran into many issues and after searching for many hours I hope somebody can help me out here! ...
2
votes
1answer
55 views

Changing DHCPv6 server

I have a DHCPv6 daemon that is answering for requests of some machines and everything is working fine. So I decided to remove this DHCPv6 daemon e start another daemon on another server, but the ...
0
votes
2answers
232 views

Set up DNS and DHCP roles on Win 2008 server. Why don't clients show up in Explorer?

I disabled the DNS/DHCP on my router and activated those services on a Windows 2008 server. Everything is working fine, but when I go to browse the network none of the machines can see any other ...
1
vote
1answer
145 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 ...
0
votes
2answers
83 views

Assign IP range per switch?

Is it possible to handout IP ranges per switch with the use of one DHCP server? Example, i have 2 Swicthes (A & B). I like to: switch a => 192.168.1.50 - 192.168.1.75 switch b => ...
2
votes
2answers
77 views

Why is a computer on my network not resolving correctly?

I am running Windows 2003 Server with Active Directory and DHCP enabled. the machine: laptop1 receives the IP: 10.2.6.134 from the Windows 2003 DHCP Server. the machine name and IP does not show up ...
-2
votes
3answers
227 views

No route to host after changing interface to static ip [closed]

I installed a Linux (Ubuntu) server inside my home LAN, initially it's automatically configured to use DHCP interface. I'm connecting to this server from another computer using that server's hostname. ...
1
vote
1answer
1k views

Vyatta: how do I view up fixed DHCP leases settings?

I'd like to know how could I get the MAC-IP DHCP associations. I know that there is show dhcp leases but it only shows information about the active leases.
0
votes
1answer
550 views

Running a dhcp server on windows 7 ultimate

I'm trying to get my HP T5740 thin clients to connect to my local network without much success. I asked a question here but haven't got any response. I think that question should have been posted on ...
4
votes
1answer
3k views

Can not authorize DHCP server

I have run into a strange DHCP problem. The thing is the service is running, but the DHCP is not authorized. However, when I try to do it by right clicking, the option to authorize is not there - I ...
2
votes
1answer
894 views

When does ISC dhcpd expire leases

When exactly does ISC dhcpd forget a lease that is not explicitly freed by the client? Context: I am running an installation with many small pools (3 address) and it does not seem to cope well when ...
1
vote
0answers
113 views

How to make ISC dhcpd not log a specific hardware ethernet address (mac)

I have isc dhcpd v3 serving a local subnet. I have installed a rogue dhcp server detector (dhcp_probe) which constantly sends dhcp requests. These requests are logged by the legit dhcp server, filling ...
5
votes
1answer
2k views

Client not getting address from some DHCP server

I'm working on some embedded devices which should be connected to a large network (hundreds of devices) via ethernet and that should be configured using the DHCP protocol. What I'm experiencing is ...
0
votes
1answer
1k views

How could I fix “No subnet declaration for restart (0.0.0.0)”?

I have a DHCP service installed on my distribution, Backtrack 5 R2 (ubuntu 10.04) and it was working fine, but when I began to configure DNS it suddenly stoped working, how can I make it work again?? ...
0
votes
1answer
133 views

Setting up a small DHCP server for small network on windows server 2003

I am trying to set up a DHCP server on a Windows 2003 machine for a small network. I have used this guide[http://www.windowsnetworking.com/articles_tutorials/dhcp_server_windows_2003.html] to setup ...
3
votes
2answers
1k views

Secondary DHCP server won't start on Centos 6.2

I'm trying to create a backup DHCP server. Server times are in sync. Primary server starts fine. Secondary server won't start. Error from /var/log/messages is: Sep 15 14:47:45 stream dhcpd: ...
1
vote
2answers
550 views

dhcpd pool exhaustion - What's the result?

I have a DHCP server that serves leases to several houndred, maybe up to a thousand, different clients on an average day. The pool consists of 242 IPs, and due to the highly dynamic nature of the ...
1
vote
1answer
142 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 ...
3
votes
1answer
338 views

Multiple DHCP relay servers after one another?

Is it possible to have multiple dhcp relay servers in line? IOW DHCP client <=> DHCP Relay A <=> DHCP Relay B <=> DHCP server
0
votes
1answer
853 views

Is there a free linux distribution that provides network services with an Web interface? [closed]

What I have in mind and used is a commercial gateway/firewall with an web-interface for configuration that has this specifications: Administration Network Monitoring and logging Authentication ...
5
votes
4answers
22k views

Force the DHCP server to renew the IP address of a client machine, without doing anything in client machine

I would like to know, if there is a way I could force the DHCP server to renew the IP address of a client machine instantly, without me going to the client machine? In fact, imagine, I don't have ...
2
votes
1answer
106 views

Computers using ::1 for DNS server on DHCP ipv6

When ever i look at ipconfig /all i see that my computers are getting ::1 for the first DNS server from my dhcp server. I have removed this entry from the list of DNS server in the options, but the ...
0
votes
1answer
1k views

Ubuntu Server 12.04 ISC-DHCP-Server not working using standard configuration

I have been trying to configure the isc-dhcp-server package to assign ip addresses to devices connected to my eth1 adapter. Current Configuration interfaces: auto lo iface lo inet loopback auto ...
1
vote
1answer
126 views

Windows Server 2008 DHCPv6 Role only providing IPv6 address to Windows DHCPv6 clients?

Testing a Windows Server 2008 Enterprise SP2 server with a DHCPv6 server role configured. The Scope for the IPv6 range is 2001:db8:0:1::, there is only one exclusion and that is 2001:db8:0:1::1 and ...
0
votes
2answers
3k views

Ubuntu Server 12.04 Unable to locate package dhcp3-server

I have done a fresh install of Ubuntu Server version 12.04 and am trying to install a dhcp server package using the following command: sudo apt-get install dhcp3-server However I get this: Reading ...
1
vote
2answers
3k views

dhcpd multiple domain-name-servers

I know it's possible to assign at least two DNS servers via DHCP. For example: option domain-name-servers 8.8.8.8, 4.2.2.2; But I wanted to know if I could also add a third DNS or if this would ...
3
votes
1answer
233 views

Is there a match on incoming interface in DHCPd classes?

(Note, the title of the question Is there a way to classify DHCP requests based on the interface they're coming from? is what I want answered, but it doesn't actually ask that question for a ...
11
votes
4answers
1k views

What does a DHCP-client consider to be the “best” answer?

We have training rooms where normally Windows XP is installed (via PXE). The "normal" DNS/DHCP infrastructure are Windows-Servers. The training room has its own VLAN (different from the Windows ...
-1
votes
3answers
209 views

Temporary DHCP Static Leases [closed]

I want to set up a DHCP server that gives out semi-static leases. Allow me to explain. I want the server to give out static leases (I think these are also referred to as "sticky" leases) to users, ...
2
votes
1answer
2k views

DDNS Not Creating Journal (Dhcpd and Named)

* EDIT 1 * After monkeying with additional debug logging I see some log entries of interest. 27-Jul-2012 23:45:26.537 general: error: zone example.lan/IN/internal: journal rollforward failed: no more ...
2
votes
2answers
129 views

DHCP options “not user configurable”

I'm using dhcp on both client and server on Linux machine I would like to "force" some dhcp options from the dhcp server to the dhcp client Specifically I'd like the client to set into his lease ...
5
votes
1answer
780 views

Openwrt isc-dhcpd-4.2.4

Every time the dhcp service starts, it listens not only on 0.0.0.0:67 but also on 0.0.0.0:PORT where PORT is a random number. Anyone knows where this behaviour comes from? root@OpenWrt:/# netstat ...
3
votes
2answers
3k views

Unathorizing and removing DHCP role

I am removing DHCP from one of my server (Windows Server 2008 R2 Enterprise), besides running: netsh dhcp delete server server name *server IP* and the removing DCHP role itself from Server ...
0
votes
1answer
746 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 ...
5
votes
1answer
251 views

Is there a way to classify DHCP requests based on the interface they're coming from?

As the question title states, I want to classify my clients based on the interface their requests are coming from. Can this be done with normal matching? Or should I restrict the DHCP server to only ...
1
vote
0answers
952 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, ...
-1
votes
1answer
139 views

Get/Assign IP addresses assigned by the DHCP sever with DLink switches in between

In our office the setup is like we have a UBUNTU server with DHCP Server connected to all the PCS via 24 port and 8 port DLink switches. How can I find all the PCS(with client name, ip and mac ...
2
votes
2answers
280 views

DNS for locally defined domians not working in regular intervals

I have been having a strange problem with our locally hosted DNS (bind on ubuntu server). We have a DNS server that hosts several locally defined domains (for example, myserver.localnetwork). ...
0
votes
1answer
112 views

DHCPd and DHCPc on different UDP port?

Is it possible to create a run another custom dhcp service on different UDP port. For example port 70 and 71? Therefore all my clients pre-configured to accept this instruction and if fails fall ...
14
votes
11answers
15k views

Windows 2008 DHCP service fails - “…failed to see a directory server for authorization.”

I have a small environment running Windows 2008 R2 where the DHCP service on the domain controller fails every two weeks. The most-visible error is Event ID 1059 and the Event Viewer message is: ...