A Linux DHCP server that will listen on an non-broadcast (tap) interface?

Posted by TomOnTime on Server Fault See other posts from Server Fault or by TomOnTime
Published on 2009-11-19T17:09:34Z Indexed on 2010/04/02 0:03 UTC
Read the original article Hit count: 299

Filed under:

dhcp

|

network

|

isc-dhcpd

|

dhcp-over-vpn

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 number of others using GRE tunnels. The machines on the other end send DHCP requests to this machine, I can see them with tcpdump. However, ISC DHCP 3.0.3 refuses to listen to the interface because it is non-broadcast.

The interface I'd like DHCP to listen to is:

tap2      Link encap:Ethernet  HWaddr removed-for-privacy  
          inet6 addr: removed-for-privacy/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:518 errors:0 dropped:0 overruns:0 frame:0
          TX packets:510 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:196242 (191.6 KiB)  TX bytes:52425 (51.1 KiB)

© Server Fault or respective owner

Related posts about dhcp

nokia cell phone not accepting IP from dnsmasq dhcp server

as seen on Server Fault - Search for 'Server Fault'
Hello, I having problem connecting a NOkia cell phone to my home wifi network. The wifi network is provided by a wireless card in a machine running Debian Testing and 2.6.26-2-686 kernel. The cars is D-Link DWL-G520 working in ap mode and has WPA encryption enabled. The wireless network is provided… >>> More
dhcp-snooping option 82 drops valid dhcp requests on 2610 series Procurve switches

as seen on Server Fault - Search for 'Server Fault'
We are slowly starting to implement dhcp-snooping on our HP ProCurve 2610 series switches, all running the R.11.72 firmware. I'm seeing some strange behavior where dhcp-request or dhcp-renew packets are dropped when originating from "downstream" switches due "untrusted relay information from client"… >>> More
Windows Vista DHCP bug, arp authorize, isc dhcp, workaround

as seen on Server Fault - Search for 'Server Fault'
I am trying to find a workaround for the Windows Vista Force Broadcast bug with ISC DHCP and a Cisco Router. The problem is not windows vista trying to obtain an IP address from us that works fine (with or without the flag enabled). THe problem is we are using a cisco router and the command 'arp… >>> More
DHCP Relay V DHCP Local Cisco v 3com

as seen on Server Fault - Search for 'Server Fault'
Howdy, I have a client who has a WAN with 7 sites. At one site in particular, randomly about 4-5 clients do not get an IP address. The local gateway is a cisco 871 and relay's to a windows server in a Data Center running a valid scope for the subnet. If I put in a cisco 1800 and configure a dhcp… >>> More
DHCP Relay V DHCP Local Cisoc v 3com

as seen on Server Fault - Search for 'Server Fault'
Howdy, I have a client who has a WAN with 7 sites. At one site in particular, randomly about 4-5 clients do not get an IP address. The local gateway is a cisco 871 and relay's to a windows server in a Data Center running a valid scope for the subnet. If I put in a cisco 1800 and configure a dhcp… >>> More

Related posts about network

Changing network type from Unidentified network to Private network on an OpenVPN connection

as seen on Super User - Search for 'Super User'
Is it possible to change the connection type in Windows 7? I have a OpenVPN connection which is identified as "unidentified network" and I do not want to apply certain rules to all unidentified networks in the firewall. How does one conquer this? >>> More
nm-applet gone?

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
nm-applet seems to have disappeared from my system. I am running 12.10. Here's what I get when I check my package manager logs: ? ~ grep network-manager /var/log/dpkg.log 2012-10-06 10:37:08 upgrade network-manager-gnome:amd64 0.9.6.2-0ubuntu5 0.9.6.2-0ubuntu6 2012-10-06 10:37:08… >>> More
Ops Center 12c - Provisioning Solaris Using a Card-Based NIC

as seen on Oracle Blogs - Search for 'Oracle Blogs'
It's been a long time since last I added something here, but having some conversations this last week, I got inspired to update things. I've been spending a lot of time with Ops Center for managing and installing systems these days. So, I suspect a number of my upcoming posts will be in… >>> More
C# Neural Networks with Encog

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
Neural Networks · I recently read a book Introduction to Neural Networks for C# , by Jeff Heaton. http://www.amazon.com/Introduction-Neural-Networks-C-2nd/dp/1604390093/ref=sr_1_2?ie=UTF8&s=books&qid=1296821004&sr=8-2-spell. Not the 1st ANN book I've perused, but a nice revision… >>> More
Need for explanation: NetBIOS over TCP/IP on VMware network adapter disturbs access to network share

as seen on Super User - Search for 'Super User'
Some time ago nearly all workstations in our team (Windows XP SP2) exhibited intermittend but frequent delays when accessing shares on the network. Typically the first access to a share which hadn't been accessed for some time resulted in a nearly frozen workstation for up to 30 seconds. Then everything… >>> More