ISC DHCP is open source software that implements the Dynamic Host Configuration Protocols for connection to a local network. It is a reference implementation of those protocols, but it is also production-grade software, suitable for use in high-volume and high-reliability applications. DHCP is ...

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0
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3answers
186 views

Fixed dhcp host to automatically expire any lease

I have the following situation: Multiple offices with multiple firewall/dhcp servers. Every time the IT team of some office plugs a new network printer i need to create a fixed-address entry, and ...
2
votes
2answers
743 views

Automatic subdomain wildcard for DHCP-DDNS additions?

I'm running dhcp-4.0.2 server and bind-9.6.1-P3. When a new Mac OSX DHCP client with the name "harry" connects to the network, the DHCP server gives it a lease, and adds appropriate A & PTR ...
2
votes
1answer
452 views

isc-dhcpd static ip within range

I have a isc-dhcpd server with dhcp-range 10.0.0.10 - 10.0.0.20. There is also a device connected with static ip 10.0.0.10. What would happen when a client with dynamic ip connects to the network? ...
1
vote
1answer
62 views

Multi-homed forward zone DDNS updates always sent out the same network interface

I have a multi-homed server 'dhcp1' with network interfaces '192.168.10.151' (eth0) and '192.168.0.151' (eth1). The machine is attempting to use DDNS with a name server 'ns1' having network interfaces ...
1
vote
1answer
130 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
1answer
25 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
votes
1answer
65 views

How can I configure dhcpd to only update the reverse zone in bind?

I've got dhcpd pushing updates to bind, and it seems to be working fine: named[24161]: client 192.168.10.1#59141: signer "dhcp_updater" approved named[24161]: client 192.168.10.1#59141: updating zone ...
0
votes
1answer
115 views

Using isc-dhcp-server to allocate addresses from subnet different from server subnet

I'm trying to break my network into different subnets. Server is located into 192.168.15.0/24 subnet. I have the following declaration in my dhcp.conf: subnet 192.168.15.0 netmask 255.255.255.0 ...
0
votes
1answer
1k views

SLES DHCP Dynamic DNS: Unable to add forward map…: not found

I have a SUSE Linux Enterprise Server 11.3 install running on Amazon EC2 based off the official AMI. With DHCP and BIND configured (via yast) I'm having issues with Dynamic DNS. When a client ...
-1
votes
1answer
364 views

Multiple subnets on isc-dhcp-server using ddns with bind9

On my network I have two subnets: 10.100.1.0/24 -> Wired/wireless 10.100.7.0/24 -> VPN Both subnets are served by isc-dhcp-server running on a Debian VM. This same VM runs bind9 for my DNS. ...
1
vote
0answers
14 views

Binding ISC DHCPD to a virtual (heartbeat) interface

I had a DHCP server that acted as a relay endpoint and worked fine. let's say this is a solo machine with eth0 with an ip of 192.168.0.10 I needed to bring this server down and join it to a cluster, ...
1
vote
0answers
61 views

Advanced DHCP configuration (isc-dhcp-server)

We are managing our network by using DHCP and we sometimes add new subnets (IP Pools) to network through different VLANs. What we want to do is to manage all those IP pools from same DHCP server but ...
1
vote
0answers
48 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
vote
0answers
71 views

DHCP fault tolerant servers: Split spool or failover?

I need to replace an aging DHCP server by a fault tolerant solution. I consider using the ISC dhcp server solution which can be setup either as split servers serving non-overlapping ip ranges or as a ...
1
vote
0answers
122 views

ISC DHCPD IPv6 for multiple interfaces

I want to assign multiple IPv6 to a server with multiple NIC. As IPv6 RFC defines, each server has a unique DUID that can have one of the 3 formats (LL, LLT or enterprise). And each NIC has an IAID. ...
1
vote
0answers
95 views

How to send several instances of the vendor-specific options to a DHCP server using dhclient?

I need to send vendor-options to DHCP server using dhclient (ISC). I've added following lines in the dhclient.conf: option dhcp6.vendor-class code 16 = {integer 32, integer 16, string}; send ...
1
vote
0answers
98 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
0answers
95 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
vote
0answers
246 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 ...
0
votes
0answers
84 views

isc-dhcp-server and option 242

Trying to set up option 242 for an Avaya phone demo on our isc dhcp server. I am using the following configuration: option option-242 code 242 = string; subnet 10.30.0.0 netmask 255.255.0.0 { ...
0
votes
0answers
41 views

isc-dhcp-server sends OFFER to ip and not broadcast

I'm trying to set up the isc dhcp server. My config looks like: ddns-update-style none; default-lease-time 600; max-lease-time 7200; # If this DHCP server is the official DHCP server for the local ...
0
votes
0answers
93 views

How do I stop a Linux computer from sending a DHCP hostname?

I need to set up a Linux computer so that it uses DHCP but doesn't send any hostname at all. I'm using isc-dhclient-4.2.4 /etc/dhcp/dhclient.conf contains the line send host-name = gethostname(); ...
0
votes
0answers
63 views

dhcpd set ddns-hostname from client supplied hostname

Basic issue: I'm trying to setup BIND and DHCPD. I have both working and the only problem is DHCPD cannot update BIND zones with names of dynamic clients (those without static leases). By trial and ...
0
votes
0answers
61 views

DHCP server with ability to update mac address dynamically

Is there a better way to maintain MAC to IP specification in dhcp with out restarting dhcp service each time when there is an update. is it possible to use DHCP with database in Linux to save all ...
0
votes
0answers
61 views

Ubuntu server DNS/DHCP/MAAS woes

I've been using Ubuntu server Raring for a few weeks now. It seems to be great, but I havre a slight problem. I opted for the Metal As A service option, and now its changing my DNS records and going ...
0
votes
0answers
224 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 ...
0
votes
0answers
471 views

How to make forward domain name updates work with ISC dhcpd and Windows clients?

We have ~100 Windows 7 clients and are running dhcpd 4.2.2. We're running two daemons, one for IPv4 (DHCP) and one for IPv6 (DHCPv6). IPv6 clients correctly register under ...