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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140 views

Cannot attach CentOS VMs via DHCP following router swap

I recently swapped out an old Netgear modem/wireless router and replaced with a ZyXel P660HW-T1 supplied by our ISP. I have configured it so that the new router has the same IP address, subnet mask, ...
5
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1answer
181 views

Is it possible to receive dhcpdiscover from ff:ff:ff… mac address?

Today I saw this record in my log files: dhcpd: DHCPDISCOVER from ff:ff:ff:ff:ff:ff via vlan400: network 40.60.100.10/24: no free leases ...
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1answer
61 views

DHCP failsafe subnetwork

I have some systems connected via a simple stupid ethernet switch. Under usual conditions, the switch is connected to a large network providing DHCP service and Internet gateway. However, if the group ...
0
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2answers
434 views

How can I use my AP's DHCP server?

I have a Huwawei modem and a TP Link access point, I did the setup everything works, the TP Link is using the DHCP of the modem. The issue is that I want to use TP LINK as DHCP, not the Huwawei. In ...
1
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1answer
141 views

Difference between DHCP options 'Domain-Name' and 'Domain-Search'

What is the difference between the two? I had thought that domain-name would put the client on the specified domain (ie. If the domain-name was set to "foo.bar" the clients FQDN would be ...
0
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2answers
228 views

ASA 5505 outside access for clients with dynamically assigned IPs, no outside access for clients with static IPs

We have an ASA configured to access the internet, which works fine for clients who have an IP address assigned by DHCP, but not for clients with manually assigned IPs. For instance, with the DHCP ...
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1answer
165 views

Squid transparent proxy: bypass the dhcp server

I'm working on a simple network who consist in 4 ADSL connections managed by a ER5120 load balancer. The load balancer is connected to a switch who connects with the guys at the office. Now, I'm ...
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0answers
1k views

IP served by OpenVPN doesn't take ipp.txt into account

I'm facing some troubles right now with an OpenVPN server an former colleague set up (I'm not too into it ATM). We're using OpenVPN for a private network of ~200 clients (to be more specific, only 15 ...
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3answers
478 views

Windows server - assign IP by username

Some of my users need to have an IP from a specific range to use some services and some others don't. Since many users have access to different PCs (and sometimes they share the same PCs, too) is it ...
0
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1answer
370 views

Dual-port server acting as router, but LAN can't see WAN

Using Windows Server 2012 Essentials. I've got two ethernet ports. One is connected to a router which is connected to the internet. This portion of the network is fine. The router runs DHCP on the ...
1
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1answer
192 views

Cannot join Computers to windows server 2003 Domain

I am a complete beginner in server management, however am put in a situation to manage our companies server running windows 2003. The person before me completely screwed up tons of stuff in this ...
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0answers
12 views

w2k8 r2 single ip dhcp reservation for wireless and wired interfaces [duplicate]

Possible Duplicate: Reserve a single ip for a wired and wireless NIC of the same machine I am a bit new to Windows Servers, I'm coming from BSD world. I have a lot of laptop users at my ...
1
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1answer
279 views

Setup Network with two ISP

Currently I have a network with 1 ISP, a router/modem, Gigabyte Switch and a server. All the clients PC are automatically assign IP from DHCP server from a Router/Modem A. Server A have a fixed IP ...
0
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1answer
207 views

Debian Network boot with a VLAN (DHCP + TFTP)

I've been given 34 servers (HP Proliant) to use for HPC. Due to the server owners' request, 33 of these will need to act as diskless thick clients, and one will act as DHCP and TFTP server to enable ...
0
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3answers
1k views

DHCP giving wrong DNS servers

I have a Windows Server 2012 as a DNS and a DHCP server. Now, when a client connects he gets wrong DNS servers from the DHCP server. Not sure where these came from but I'd like to give the clients the ...
1
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1answer
126 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
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2answers
273 views

Networking (dhcpcd) under LXC

I would like to boot an Arch Linux instance using LXC. Just about everything works, but I'm encountering the following error when trying to configure an interface using dhcpcd: # dhcpcd eth0 ...
0
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1answer
251 views

Assign multiple IP addresses in NAT mode to the same VM

I'm aware that VirtualBox assigns the same IP to different VMs (by default 10.0.2.15), however I have a case where I have a VM with a single vNIC, and a Linux namespace inside the VM attempts to get ...
0
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2answers
80 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 => ...
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2answers
1k views

2 DHCP servers, VLANs, Mitel 3300, Sonicwall TX 215 conflict

Inherited a system that has likely not been properly maintained for about 10 years. Add to this that the firewall had to be replaced because the original one was not accessible because the former ...
1
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1answer
93 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. ...
2
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2answers
144 views

Dhcrelay init.d script runs improperly

I am trying to use dhcrealy on a CentOs 5 kernel which have kernel version 3.5.3. I configured /etc/sysconfig/dhcrelay file like that dhcrelay -i eth1 192.168.0.1 While dhcrealy is stopped, I ...
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2answers
202 views

How can I configure ubuntu to have a static IP address but still use DHCP for other configuration information?

I want to use DHCP to pick up the network configuration information including DNS, but still assign a static IP address. On OS X, this is "Using DHCP with manual address", but I see no similar ...
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1answer
1k views

DHCP relay through Fortigate 60B firewall isn't working

I inherited a network with a Fortigate 60B firewall. The VPN dial up client works right now as long as I specify a static IP. Problem is, it becomes hard to manage when I need to assign each and every ...
1
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1answer
307 views

Hyper-V Server sends constant stream of DHCP requests causing DoS

I have a Hyper-V server that I think the networking components are misconfigured. Even when I've set a static IP address, the server sends a constant stream of DHCP Discover broadcasts (the physical ...
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1answer
39 views

Possible to supply two different configurations on the same physical network, so that they are selectable as 2 alternatives in NetworkManager? [closed]

Is it possible to supply two different network configurations (say, by two DHCP servers), so that they are selectable as 2 alternative wired connections in NetworkManager (GNU/Linux)? The motivation ...
4
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2answers
563 views

What would cause a PBX or SIP phone to not register on the network when using Netgear Switches?

We have 3 different types of switches in our network. All of our IP Phones are running on HP 2520-24 PoE switches. Our primary backbone is "supposed to be" running on Netgear GS748T switches. ...
1
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1answer
314 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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2answers
566 views

Switch sending DHCP packets to wrong VLAN

I have a basic remote site with a Cisco Catalyst 2924XL switch. There are 2 VLAN's at the site: 1 Default 2 Wireless There is a single server connected via a single ethernet cable, VLAN 1 is ...
2
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2answers
75 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 ...
0
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1answer
227 views

Domain rebuild from scratch

I have to rebuild the entire domain of a company I just started with. It currently runs SBS2003 but it is "FUBAR". MMC is not working, I cant use the BPA on it. I cant get adprep to work to do the ...
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1answer
277 views

start of dhcp failed on centos [closed]

i try to config DHCP on centos. when i start service by #service dhcpd restart it failed. the result of #tail -f /var/log/messages : Dec 31 19:26:31 localhost dhcpd: exiting. Dec 31 19:27:04 ...
3
votes
1answer
517 views

error in config DHCP on centos6

I was trying to configure DHCP on centos 6.my eth0 configuration is: [centos@localhost ~]$ cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE="eth0" BOOTPROTO="dhcp" HWADDR="00:0C:29:AE:62:BC" ...
2
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0answers
2k views

Setting Shoretel phone time correctly with dhcpd

Our Shoretel 230 phones are not picking up time service correctly and thus, the time on the display is wrong. When I go to the diagnostics of the phone, they are using a wrong time server (old). Here ...
2
votes
1answer
7k views

how to fix “no free leases” issue in dhcp3?

I am facing no free leases issue. I am building a new server. I have successfully installed ltsp. Then, I configured the dhcp. This is my dhcpd.conf file. option subnet-mask 255.255.255.0; option ...
1
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1answer
870 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 ...
0
votes
3answers
316 views

Windows Server DHCP vs. Cisco DHCP [closed]

One of our contractors just tried telling my boss that we should be using our Cisco ASA to serve DHCP instead of our DC... Is there any merit to this? Or is he just, once again, blowing smoke.
0
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1answer
461 views

Windows 7 PTR records with Cisco DHCP server

I would like to have my windows 7 clients register their own PTR records since I use a Cisco DHCP servers. DNS is Active Directory integrated. How can I go about doing so without setting up a ...
3
votes
1answer
179 views

Is there any difference running dhcrelay with multiple process or single process?

I want to ask about dhcreay running mechanism. We can run dhcrelay with two command, then it will run as 2 process dhcrelay -i eth3 172.16.17.3 dhcrelay -i eth1 172.16.17.5 #ps ax | grep dhcre 26464 ...
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votes
3answers
151 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
94 views

Cisco SA520 to Adtran 1234 no DHCP transfer

I am trying to set up a Cisco SA520 to run DHCP on my network. I have a vendor provided switch, the Adtran 1234, and it provides DHCP for our phone systems on VLAN 200. I do not have access to the ...
2
votes
1answer
182 views

Linux IPv6: DHCP and /127 prefixes

I've tried multiple pieces of DHCP client and software in attempting to setup a solution for allocating a /127 prefix to virtual machines so that each maintains its own layer 2 isolation. Because ...
0
votes
2answers
102 views

Server 2008 DHCP some clients not getting IP

Today (after turning on the server from an extended power outage) some clients are not able to get IP addresses. Some clients work just fine. Win 7 and XP doesnt seem to matter. I have tried flushing ...
1
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1answer
664 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.
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2answers
283 views

Cisco IOS switch dropping legit DHCP requests

We have Cisco Catalyst 4507R running IOS v12.2 that appears to be dropping valid DHCP requests. Checking for the requests using tcpdump on the DHCP server and on a machine connected to a monitoring ...
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1answer
181 views

Any way to assign two IPs with different DHCP settings on my network setup? [closed]

I currently have a router (Netgear WNDR3700 with DD-WRT; let's say its hostname is host1) and all the devices are behind its NAT. WAN \ \ host1 (dmz) ...
0
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1answer
92 views

Changing DHCP Scope brought down the Internet connection

My school DHCP server(Win2008) runs out of IPs so I expanded the scope: original: 10.20.1.0 to 10.20.2.255 new: 10.20.1.0 to 10.20.3.255 But as soon as I finished it, all my workstations could not ...
4
votes
1answer
285 views

Static to DHCP, bat file

I have this code (.bat file) that I want to run by going to each computer that is logged in and executing it. However, not all users have admin rights. Is there anything I can do without logging off ...
1
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0answers
287 views

Slow Starting DHCP Client Service - HP Thin Clients

We have recently began adding XPe thin clients to our domain in preperation for a new citrix environment. One thing that has been picked up on in testing is that they appear slow to boot. The issue ...
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0answers
232 views

Sonicwall bulk DHCP reservation

We are migrating over to using SonicWALL as our firewall from Microsoft Forefront TMG. I have managed to export our DHCP Reservations from the DHCP Service running on our TMG box but want to avoid ...