Dynamic Host Configuration Protocol (DHCP)

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2
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1answer
73 views

2 client classes sharing the same subnet range

basically I would like to achieve the followings: using only one subnet different types of user sharing this subnets creating 2 pools accordingly an user class called "l2vpn_user" if matched by MAC ...
2
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1answer
3k views

Windows Server DHCP import/export scopes using netsh.exe

We have Windows Server 2008R2 as domain controller with DHCP Server functionality. Task was to make reserve server on remote site in case of failure of main one. The reserve one will be running ...
2
votes
1answer
523 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 ...
2
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1answer
184 views

Cannot assign IP address according to an option parameter

I have this DHCP conf file: authoritative; option domain-name "XXX.XXX.XX"; allow bootp; ddns-update-style ad-hoc; class "karpuz-kabugu" { match if (substring (option user-class, 0, 6) = ...
1
vote
1answer
37 views

1-dhcp server for 2 separate network

Debian Server Setup (wheezy) 1 - eth0 - Connected to INTERNET 1 - eth1 - LAN 1 (Network 1 : 192.168.100.0/24) 1 - wlan0 - Access Point (Network 2 : 192.168.200.0/24) /etc/network/interfaces auto ...
1
vote
1answer
51 views

Workstations connected to SBS 2011 can not connect to “http://connect/” and are getting frequently disconnected or kicked off of the shared drives

Small Office, there are 7 computers and a server running SBS 2011. 2 workstations are not currently bound to the server, because after recently reinstalling windows 7 on them, it was discovered that ...
1
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1answer
257 views

Cleanup DHCPD leases as well as DDNS Entries

I have a fairly simple set up on a Debian server I'm running. I currently have isc-dhcp-server installed along with bind9. I set up my zone and my reverse lookup zones and set up dynamic updates, it's ...
1
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1answer
94 views

Multiple DNS mappings for a host via DDNS

I have a network in which DNS is automatically updated with a record for hosts when they get an address via DHCP (isc-dhcp-server & Bind configured with DDNS updates). The DHCP server is ...
1
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1answer
147 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 ...
1
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1answer
145 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 ...
1
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1answer
541 views

Some clients aren't updating using dhcpd's “ddns-update-style interim” with Windows dns servers

I am using dhcpd 3.0.5 and Windows 2008 R2 for dns. I have "ddns-update-style interim;" set and the Windows server is set to allow unauthenticated updates. Most of the time this works great, but ...
0
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1answer
65 views

calculate reserved ip address based on mac address

Is it possible to calculate ip address based on mac address for isc-dhcp server? For example: 'aa:aa:aa:aa:aa:x' => '10.10.10.x' I have following in dhcpd.conf: subnet 10.10.10.0 netmask ...
0
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1answer
462 views

configure a dhcp server to serve two different scope on the same subnet with multiple interfaces

Ok, so here I am with a pretty complicated problem on a Debian Wheezy server I have three interfaces : eth0, eth1 and wlan0 on a single server, eth0 will act as a gateway for eth1 and wlan0, I have a ...
0
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1answer
720 views

CentOS: DHCP Server and DHCP relay on same machine

eth0 IP: 192.168.1.100 Alias interface eth0:dhcp IP: 10.10.1.100 dhcpd.conf: authoritative; local-address 10.10.1.100; subnet 10.10.1.0 netmask 255.255.255.0 { range 10.10.1.10 10.10.1.50; ...
0
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1answer
219 views

Ubuntu server dhcp reservation not working

I need some suggestion, if possible, about a dhcp server and ip address reservation. The system is a Ubuntu server 12.04 LTS. The DHCP is ISC DHCPd version 4.1. This is the /etc/dhcp/dhcpd.conf ...
0
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1answer
128 views

Forwarding all HTTP/HTTPS traffic to a port with iptables

I'm trying to setup a wireless network that routes all traffic to a local webserver (basically a hotel wifi login page). Here's my dhcpd config: $ cat /etc/dhcpd.conf ddns-update-style none; ...
0
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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
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1answer
97 views

DHCPv6 Server IP address

I am new to DHCPv6. In dhcpv4 we have Option 54 to retrieve the Server Identifier (ie. Server IP address) in DHCP message. Similarly how to retrieve DHCPv6 Server IPv6 address in DHCPv6 Message. I ...
0
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1answer
664 views

Error - reading DHCP configuration file. No such file or directory. Solaris 10

I'm currently working on a Sparc Sun-Fire-280R running Solaris 10 8/10. The machine has dhcp-server preconfigured to use NIS from the onset but I don't have any knowledge of where those config files ...
0
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1answer
479 views

How do I setup Ubuntu interfaces so one interface is “mapped” to another?

I have recently setup a DHCP-Server on an Ubuntu 10.04 server machine. The machine has two interfaces (eth0, eth1). I have the DHCP server setup correctly because computers connecting to the network ...
0
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1answer
70 views

Setting Windows Server 2003 DHCP

I have a Windows server 2003 with two NIC one is setup to connect to the network with static IP/internet, and the other one is supposed to be used internally as DHCP server. However I am having ...
0
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1answer
791 views

dhcp-server + iptables: Can't share ppp internet connection

I had this configuration before, and it used to work well, but now I got a new server and I can't setup it to share the internet connection from ppp0. I'm on Debian testing. The client connects ...
3
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0answers
2k views

DHCP Server Not Offering to PXE Client

DHCP Server Not Offering to PXE Client BACKGROUND: I'm in the process of adding PXE services to an existing SCCM 2007 server. The SCCM server is separate from the DHCP server (Server 2008 x86) and ...
2
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0answers
84 views

How to associate a DHCP pool or subnet with declarations for a class

I have the following working configuration for ISC DHCP server 4.1.1, which hands out fixed addresses to registered clients. Some of those clients are configured for PXE booting (for FAI and SCCM). ...
2
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0answers
52 views

DHCPD does not allow filename option with a colon in it

For some reason, tftpboot does not work with a colon in filename parameter: group { filename "node7:linux/pxelinux.0"; host machine_7a { hardware ethernet 02:01:02:02:01:11; ...
2
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0answers
227 views

dhcpd.conf rule-based mapping

We have ~100 physical nodes which can host a large number of VMs apiece. We need to set up dhcpd on one machine to distribute addresses in a predictable fashion based on MAC address. We'd like to go ...
1
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0answers
121 views

2008R2 DHCP Server Becomes Unresponsive

At the end of 2013, our single Windows Server 2008R2 DHCP server started becoming unresponsive once every week or so. The server itself was up, but the DHCP server was unresponsive. Attempts to ...
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0answers
50 views

dhcp relay with failover to local service

I'd like to set up a dhcp server which normally relays to a central site, but has a pool of addresses to hand out if the link to the central site goes down. I'm using isc dhcp server on Debian, but ...
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0answers
283 views

One server has multiple IP address leases but just one adapter and no dhcp reservations?

One of our servers' has multiple (10) DHCP Addressleases and I don't know why. The server itself has only one adapter and even if I execute ipconfig /all I only see one IP address defined. Even in the ...
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0answers
96 views

Access Denied DHCP Tool

I cannot figure out why this is happening, when opening the DHCP tool on my server, I get the following message. Access Is Denied You do not have access to this DHCP server. To view information ...
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0answers
52 views

force dhcp server to always run

I have an Ubuntu machine with two Ethernet network interfaces and on one of them I am running a DHCP server (isc-dhcp-server). I noticed that the server daemon stops running whenever I suspend the ...
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0answers
637 views

DHCP offer is unicast but DHCPACK is broadcast

My DHCP server broadcast DHCPACK 0xffffffff . it is not working on layer 3 dhcp relay agent . as it can not forward this broadcast message to my client. can any one help me from exactly the broadcast ...
1
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0answers
887 views

dhcping “no answer” on CentOS 6.4

I installed a DHCP server (yum install dhcp) and this is my conf: # create new # specify domain name option domain-name "mydomain.name"; # specify DNS's hostname or IP address option ...
1
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0answers
131 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 ...
1
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0answers
125 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 ...
1
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0answers
1k 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
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0answers
314 views

ISC-DHCPD failover, Modifying host definitions via OMAPI

Background: I'm working on replacing my single DHCP server with 2 in a failover configuration. When I do a DHCP request I see the lease is created in both dhcpd.leases files on each server. However, I ...
1
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0answers
551 views

dhcp-server with 2 subnet problem

How can I have 2 subnets (net1 and net2), one that alloweds all and the other only allowes selected hosts based on mac address? Here is my dhcpd.conf ddns-update-style none; log-facility local7; not ...
0
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0answers
17 views

How to disable or turn off DHCPv6 on Cisco 3939B router?

I am trying to set up a Windows Server 2012 R2 Essentials server properly. I would assume it could also apply to non-Essentials also. i.e. Standard. DHCP for BOTH IPv4 and IPv6 MUST be turned off or ...
0
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0answers
24 views

Server 2008R2 DHCP Server not responding to Windows Clients

I have a Windows 2008R2 Server running DHCP Server, configured with a custom dll to assign IP addresses based on circuit IDs. Linux clients and pxe boots (using ipxe) recieve IP addresses from the ...
0
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0answers
27 views

Polycom phone not requesting DHCP offer

My Polycom IP550 phone is not requesting the DHCP address that my windows 2012 server offered it. I have done a wireshark capture on a mirrored port on our switch and you can see that the phone is ...
0
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0answers
55 views

Windows DHCP server not discarding PTR records when an address is leased

Got the following setup regarding DHCP & DNS: Windows Server 2003 doing DHCP Windows DNS (different server)authoritative for the forward zone BIND DNS (on a UNIX server) authoritative for the ...
0
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0answers
27 views

DHCP Config for Server 2012 R2

This question may have been covered before, but it is rather complex and haven't found a similar post, so please be kind! I think my issue is rather unique, so I'll try to explain as best I can. I'm ...
0
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0answers
96 views

Windows 2012 DHCP ignores priority among server / range / class-policy / reservation options?

I am observing that the priority of DHCP settings in Windows 2012 DHCP server server options range options class options reservation options among which the ones listed later always override ...
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0answers
224 views

CentOS DHCP server supporting multiple subnets on a single NIC

I understand that what I am asking has been asked a million times already. I think I have read just about every post I can find on the subject yet I still cannot get this to work. I have a DHCP ...
0
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0answers
253 views

Why need DHCP Relay (Watchguard) inside the Trusted network?

I run a small network that looks like this: { Win 2008 server , desktops , Wifi AP} -> Switch -> Watchguard XTM21 firewall (the Switch is connected to the XTM's Trusted interface ; the XTM ...
0
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0answers
54 views

DHCP Randomly Not Assigning Addresses

Having a strange issue for the past day or so. Some users (probably about a dozen, dozen and a half out of 100 or so) are having trouble pulling DHCP. They are getting the private IP address. If I ...
0
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0answers
734 views

i am not able to pass dhcp requests across vlan

I am running dhcp on server 2012 and an astaro UTM firewall. I have a catalyst 3560 with vlan 20, 30 and 40. vlan 20 being the native vlan. When using astaro firewall for dhcp with scopes for each ...
0
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0answers
244 views

Windows DHCP server not sending all options

I'm facing a strange problem with Windows Server 2003 and its DHCP server. Here is my scope and its related options. However when I look at the traffic using Wireshark, here is what the server is ...
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0answers
10 views

Sharing an internet connection with 3rd party DHCP server on Windows (other than default ICS)

I am writing a script that would install software packages on 150+ devices that runs Open-wrt Linux. I will be running software installation scripts on 8 devices at a time via ssh. Since I do not have ...