The isc-dhcpd tag has no wiki summary.
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1answer
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ISC-DHCP-SERVER - Can different reservations get different options (router, DNS, etc)?
Suppose there's just one Ubuntu / ISC-DHCP (v3) server on the network. I've successfully been able to provide "DHCP reservations" meaning MAC foo gets ip 1.2.3.4, whereas everyone else just gets an ...
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50 views
isc dhcpd: how to insert option 61 (client id) into dhcpoffer
I have a quick question. Is it possible to make ISC dhcpd server insert the option 61 (client id) in DHCPOFFER, in case if it is present in DHCPDISCOVER?
The ISC dhcpd version I'm using is dhcp-4.1.1 ...
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1answer
69 views
Force windows 7 to update dns through dhcp server?
I have setup a new BIND9 to allow dynamic updates from my DHCP3 server. I am securing it using a DNSSEC key. Everything appears to work except when my windows workstation grabs an IP address it tries ...
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130 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 ...
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1answer
134 views
Is it possible to make ISC dhcpd (IPv6) 4.2.2 unicast-only?
I ask because the server is handling DHCPv6 for two VLANs and I can see some requests both via DHCPv6-relay from our ProCurve switch and via the ff02::0:2 anycast address and responds to both ...
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2answers
81 views
DHCP configuration problem
EDIT:
We have following setup:
User comes to building, he gets address from range for unknown clients (192.168.100.0/25) and can only get to our web site. We call it anonymous range. Let's say our ...
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3answers
2k views
How to configure radvd, dhcpd6, routing and /64 subnet based on delegated prefix by DHCPv6-PD server?
My ISP has just started IPv4/IPv6 dual stack service. In order to connect IPv4/IPv6 internet, almost all users usually use a CPE leased by the ISP. But I want to use my Linux router instead of such ...
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1answer
64 views
Is “broadcast-address” necessary in dhcpd.conf?
Or, more generally, is it required to specify the broadcast address that a client should use when a DHCP server is assigning an address?
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3answers
486 views
Exclude IP address from DHCP pool
Is there a way to exclude an ip address from dhcp pool? For various reasons i have a machine that I can't reconfigure or move off the network (lets call it a printer). It has been hard coded an ...
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3answers
526 views
modify dhcpd.conf via script to convert whole subnet to DHCP reservations
We have a hodgepodge of systems that are either static IP addresses, or DHCP reservations. (We don't hand out any addresses except reserved ones). Some servers have multiple Nics, and ILO cards. Its ...
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3answers
282 views
Monitoring an ISC DHCP Failover Status Using Nagios
I recently implemented ISC DHCP Failover and it's working beautifully, but I'd like to monitor the current status of the failover using Nagios.
Ultimately, I would like my Nagios check to:
report ...
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1answer
166 views
ISC DHCP server: how many IPs are in use?
I'm wondering what is the correct way to count how many IPs are in use in my network according to the dhcpd process.
Is it just a matter of counting "binding state active" lines in dhcpd.leases file? ...
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0answers
159 views
OpenLDAP rwm overlay trickery
I use OpenLDAP and isc-dhcp-server-ldap from Debian. It is a patched dhcp server based on idiotic LDAP tree design:
There needs to be a dhcpService, dhcpSettings object with some redundant ...
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2answers
837 views
ISC DHCP - Force clients to get a new IP address, instead of the being re-issued their previous lease's IP
We are in the middle of a migration of our DHCP and DNS services from a Debian-based server to a Windows Server 2008 R2 implementation. The Debian server is running isc-dhcpd-V3.1.1. All of ...
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2answers
394 views
Is the native DHCP client for MacOS X able to send “Vendor class identifier” (opTag 60) in a DHCP request?
Is it possible for MacOS X (current version or in any previous one) to easily
force DHCP client to send to DHCP server, at the beggining of the conversation - in DHCPDISCOVER packet - option "Vendor ...
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1answer
498 views
Iptables - Allowing only a single dhcp (relay) client
I am trying to create a firewall rule on an Ubuntu 10.04 server running isc-dhcpd. I only want dhcp to be accessible by a single relay host (172.1.1.1). I have iptables set up like so:
# iptables ...
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3answers
211 views
why would dhcp listen port 80
I have a CentOS server with isc dhcpd and apache 2 webserver running. A couple of minutes ago I have tried to restart apache:
/etc/init.d/httpd restart
Restart has failed with:
Starting httpd: ...
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1answer
1k views
dhcpd, DISCOVER, “no free leases”
I am attempting to set up a VERY simple DHCP server. I am using Ubuntu 10.04, and I installed the "dhcp3-server" package. The server has one interface (eth0) statically set to 10.0.0.10(/21). I want ...
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4answers
851 views
DHCP server with database backend
I have been looking around for something to replace my (ancient) ISC-DHCPd server.
A DHCP server with a database backend sounds like a great idea to me, as I could then have a nice, friendly web ...
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1answer
3k views
Windows 7 Failing Ping on IPv6 in DHCP Setup
I have set up a test ISC DHCP server that is not connected to an internet with DHCP and DHCPv6. I also have a Cisco 3750G with IPv6 enabled. I have firewalls off on both machines.
My Windows 7 ...
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3answers
336 views
dhcpd won't let go of old leases
We have DHCP setup to hand out leases in the following range:
192.168.10.190 - 192.168.10.254 (roughly 65 leases)
Our small business network only has about 30 computers that use DHCP. We noticed ...
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7answers
554 views
Audit reserved IPs for UNIX/Linux ISC-DHCP
Are there any good FOSS tools to do an audit of reserved IPs used in a Linux/UNIX ISC DHCPd environment? I'm trying to ensure that we do not have stale IP addresses reserved when old MAC addresses ...
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1answer
391 views
Windows 2003 DNS updates from ISC DHCP server
We have a very mixed network, with most clients being Debian Lenny, the rest Windows XP/Vista/7. The network itself is split into two segments (for technical reasons) called "corporate" and ...
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1answer
673 views
Accessing DHCP Client's vendor-encapsulated-options
In the dhcpd.conf file for isc-dhcpd-V3.1.1, I have set up a vendor options space and defined several different options. I am able to use those definitions to send options from the server to the ...
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1answer
448 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 ...
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3answers
500 views
Where is dhcpd's syslog message formats documented?
I am looking at bunch of syslog messages written by dhcpd. I want to write a quick parser that can deconstruct the message into its component parts, but I don't know what the various parts mean. I ...
1
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1answer
832 views
How to ignore a set of Mac addresses in dhcpd.conf?
Is it possible in dhcpd.conf to ignore requests from a set of MAC addresses?
Something like this:
host vminstances {
hardware ethernet d0:0d:*;
ignore booting;
}
7
votes
4answers
810 views
DHCP on-the-fly block assignment
We have a large number of clients who connect to our DHCP machine. We want to assign some of them to a different IP block, which is routed with lower priority. Every DHCP lease renewal, we'd like to ...
3
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2answers
623 views
A Linux DHCP server that will listen on an non-broadcast (tap) interface?
Are there any Linux DHCP servers that will listen to what Cisco calls an "unnumbered" interface, or what others might call a "NBMA" (non-broadcast) interface.
I have a Linux system that connects to a ...
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2answers
1k views
Assign DHCP IPs for specific MAC prefixes
I'm running a ISC DHCPd server for my network serving a number of subnets. One of the things I would like to do is assign a specific range of IPs to hosts with a common MAC prefix (ex. 00:01:02). ...
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5answers
2k views
DHCP: Logging host declarations in log file
I am currently running ISC-DHCP server v3 on Ubuntu 8.04. What I am trying to do is log Who got what IP address when.
Currently in the DHCP log file you can see the following:
DHCPDISCOVER from ...
2
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4answers
3k views
Option 82 and dhcpd. “No free leases” for second computer
There is DHCP server in network (isc-dhcpd-server-3.0 on FreeBSD 7.2) than gives one IP per switch port to every user via Option 82
The problem appears when user disconnects one of his computers and ...
