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Questions tagged [dhcp]

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

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator.

The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s), though there are many more possible configurations that can be sent out using the DHCP protocol.

More in-depth detail on DHCP and its implementation can be found at Wikipedia.

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How can I change the MAC address of a network bridge in Windows?

I use DHCP reservation rather than static IP for convenience, and that relies on the MAC address of my computer. I recently bridged my main adapter with my VirtualBox adapter. When things stopped working, I realized that the MAC address is now…
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Stop DHCP client from receiving old IP address on new VLAN

I have one DHCP server running Windows Server 2008 R2. It is configured with one Superscope which contains 5 member scopes. One scope for each one of my subnets. Here is the problem, if I am on VLAN 12 I get a VLAN 12 IP but if I disconnect my…
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Why does Debian squeeze forget its static IP address and seek a DHCP lease?

Hi have a Debian Squeeze box with eth0 and eth1. In /etc/network/interfaces is: auto eth1 iface eth1 inet static address 10.1.2.208 netmask 255.255.255.0 gateway 10.1.2.1 But every 24 hours, eth1 loses its statically-assigned IP address, and…
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Passing client MAC addresses to DHCP server over VPN

I'm tasked with implementing VPN access on a gateway. The LAN DHCP server is configured to assign the same IP address to a given MAC address. I would like to have this functionality for clients who connect over the VPN. I know I can configure…
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Request multiple IP-addresses via DHCP on a single physical interface (OpenBSD)

On OpenBSD, is it possible to request multiple IP-addresses via DHCP on a single physical interface? It looks like DHCP leased addresses can't be assigned as aliases. I though of creating a virtual interface and forward traffic to the physical…
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/32 subnets on Ethernet via DHCP

Is it possible to assign to an ethernet host via DHCP a subnet mask of only the host itself, e.g. 192.168.1.123/32? Do common operating systems support this kind of configuration? I'd like for the hosts to send all of their traffic to the router…
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Two DHCP server in the same subnet

So I change jobs recently and in this new workplace I've found that we've actually got two DHCP servers. In the very same subnet, and they both have the same scope. I did not set up this but I see there are a lot of IP address conflicts, which must…
Kenny Bones
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What do DHCP Lease Time and Domain Name do?

Why do we need to set a lease time to a DHCP server? What happens to a client who uses that IP address while it was expired? If i set its time to 100 years, what difference does it make? Also, i don't know why we have to set a domain name to a DHCP…
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Windows Server DHCP assignment based on MAC of client

I need to serve slightly different DHCP information to clients based on the MAC address prefix. MAC addresses from a particular vendor need to have PXE assigned to a certain host, while all other devices need to receive PXE information for another…
Shaun
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DHCP-Server - tell clients to renew lease

I have just set up a new DHCP server (dhcpd - package is dhcp3-server) on a Debian 6 box.The new server is up and running, and I have successfully connected a client. Formerly a router acted as the DHCP server. My question: is there any way to send…
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Two DHCP Servers, Block Clients for one of them?

I am building out a kickstart network that resides on a different VLAN uses its own DHCP server. For some reason, my kickstart clients kept getting assign IPs from my primary DHCP server. The way I have it set up is that I have a primary DHCP server…
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Migrate linux dhcp to active directory

I need to migrate/convert a dhcp server from linux to active directory. It's currently running fine on a sles9 box. There are 136 subnets defined and about 1200 fixed-address reservations. It would be nice if the existing dhcpd.conf could be…
Richard
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Dealing with iPad DHCP Issue

According to Princeton University, the iPad (and perhaps other iOS devices?) seems to have had various issues with DHCP that exist even on the current version (4.3.3). The current one involves the device keeping (and using) an expired DHCP lease…
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DHCP request error. Send_packet not permitted, How to debug, What does it mean

I recently installed CSF firewall and have made live a new server which is accepting around 600req/second. Its basically a reverse proxy and I found in pingdom and munin that for a particular time, the response times of the server increased by 3…
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How to properly nest a wireless router behind a wired router?

I wish to repurpose a wireless router to serve as a wireless access point behind a wired router (serving as gateway to WAN) so that I don't have to buy more hardware and recapture value on prior equipment investment. As far as I know, I should set…
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