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Operating Systems Linux Ubuntu Ubuntu Server in VM - DHCP Server not working Post 302958247 by Portuguevos on Tuesday 20th of October 2015 12:24:30 PM
Old 10-20-2015
Ubuntu Server in VM - DHCP Server not working

Doing my first steps in Linux and while trying to configure a DHCP server in Linux i encountered some problems:


- Laptop with Windows 8.1
- VM Player 12 with Linux installed (Ubuntu Server 14.04)
- ICS-DHCP-SERVER installed and running
- Another LAPTOP conected to a switch to verify IP discover.

The problem i have is that neither my windows or whatever device i connect can receive IP from Linux DHCP server.

I selected bridge mode in the custom configuration: Vmnet0 which is bridge mode.

- IN DHCP cliente activated i do not receive anything. For test purpose i configured a static IP: and the gateway of my router

My ethernet card is named eth0.
editing /etc/dhcp/dhcp.conf i left all lines as they were having:

ddns-update-style none;
option domain-name "";
option domain-name-servers,;

default-lease-lite 600;
max-lease-time 7200;
option subnet-mask;
option broadcast-address;
option routers;

subnet netmask {


Since this VM will be my DHCP Server i configured a static IP in my NIC. So editing /etc/network/interfaces i configured:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static

- Having static IP in my Windows and in Linux insidw VM i have ping. - Ping OK against from both machines.
- My windows do not receive IP from VM DHCP Server.
- If i change the configuration from my ETH0 interface and configure it with DHCP instead of static IP, the ICS-DHCP-SERVER does serve an IP correctly.
- Windows with firewall deactivated. No antivirus.
- Ubuntu firewall ufw disabled.
- In summary DHCP Server is not working outside of VM.
I already tried (since nothing works) configuring the network adpater in bridge mode, NAT, and nothing works.

Can somebody help with some idea i am not considering?

THank you so much.
Test Your Knowledge in Computers #280
Difficulty: Easy
CPU modes (also called processor modes, CPU states, CPU privilege levels and other names) are operating modes for the central processing unit of some computer architectures that place restrictions on the type and scope of operations that can be performed by certain processes being run by the CPU.
True or False?

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dhcping(8)						      General Commands Manual							dhcping(8)

dhcping - send a DHCP request to DHCP server to see if it's up and running SYNOPSIS
dhcping [-v] [-q] [-i] [-r] -t maxwait -c client-IP-address -s server-IP-address -h client-hardware-address [-g gateway-IP-address] DESCRIPTION
This command allows the system administrator to check if a remote DHCP server is still functioning. Options are: -v Verbose, print some information. -V Very verbose, print a lot of information. -i Use DHCPINFORM packets. -r Use DHCPREQUEST packets (default behaviour). -q Quiet, print nothing on the screen. -t maxwait Maximum time to wait for an answer from the server in seconds. Default is 3 seconds. -c client-IP-address Request this IP address. Note that this is also the IP address the answer will be sent to. -s server-IP-address Send the DHCP packet to this IP address. -h client-hardware-address Use this hardware-address in the DHCP request. It can be up to sixteen octets separated by colons (i.e. 01:02:03:04) -g gateway-IP-address Use this IP address for the gateway IP address in the DHCP packet. This option is currently broken. RETURN VALUES
If everything goes okay, it returns 0. If there went something wrong, it returns 1. SETUP
This program should be installed setuid root or ran by root only. See SECURITY for more information. On your DHCP server, add these lines to the dhcpd.conf: host <your monitoring host FQDN> { hardware ethernet <your monitor host mac address>; fixed-address <your monitoring host IP address>; } Then try it: $ dhcping -c your monitoring host IP address -s your DHCP server IP address -h your monitor host mac address It will either respond with "no answer" or "Got answer from: your DHCP server IP address" The DHCP server logfile will give: DHCPREQUEST for from 00:20:18:56:29:8f via ed0 DHCPACK on to 00:20:18:56:29:8f via ed0 DHCPRELEASE of from 00:20:18:56:29:8f via ed0 (found) Running in DHCPINFORM mode with -i: If you see "DHCPINFORM from via xl0: not authoritative for subnet", you should add the authoritative statement to the subnet, See dhcpd.conf(5) for details. When running in very verbose mode, dhcping tries to dump all data of the send and received DHCP packets. It will first dump the packet in hex-format, then decodes the header and finally the options. HOW IT WORKS
The client either sends a DHCPREQUEST or DHCPINFORM packet to the server and waits for an answer. Then, if a DHCPREQUEST was send, it will send a DHCPRELEASE back to the server. SECURITY
This program is installed setuid root as it requires the privileges to bind itself to port 68 (bootpc). Root privileges are dropped as soon as the program has bound itself to that port. BUGS
Currently (this may, or may not, change in the future) the ISC DHCP daemon does not write leases with a fixed IP address in the dhcpd.leases file. DHCPINFORM packets can only be used on subnets the server is authoritative for. If the monitoring script runs on a subnet the server isn't authoritative for, it should use the DHCPREQUEST packets. I also experienced some problems with ISC DHCPD v2 servers, but that is also in the README of it. The -V option is still working, but shouldn't be used for debugging of the packets. Better use dhcpdump(8) for that, which is available on my website. I wanted to remove it, but decided only to do it from the documentation, not from the code. Maybe I'll need it one day for debugging. AUTHOR
Edwin Groothuis, ( SEE ALSO
dhcpd(8), dhclient(8), dhcpd.conf(5), dhcpdump(8) 3rd Berkeley Distribution January 27, 2002 dhcping(8)

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