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I set up my /etc/default/isc-dhcp-server and set eth0 in /etc/dhcp/dhcpd.conf

Why is the isc-dhcp Server not running? When I execute sudo service isc-dhcp-server status and got this:

root@ubuntu:~# service isc-dhcp-server status

● isc-dhcp-server.service - ISC DHCP IPv4 server

   Loaded: loaded (/lib/systemd/system/isc-dhcp-server.service; enabled; vendor preset: enabled)

   Active: failed (Result: exit-code) since Di 2015-11-03 15:27:57 CET; 15s ago

     Docs: man:dhcpd(8)

  Process: 6982 ExecStart=/bin/sh -ec      CONFIG_FILE=/etc/dhcp/dhcpd.conf;      if [ -f /etc/ltsp/dhcpd.conf ]; then CONFIG_FILE=/etc/ltsp/dhcpd.conf; fi;      [ -e /var/lib/dhcp/dhcpd.leases ] || touch /var/lib/dhcp/dhcpd.leases;      chown root:root /var/lib/dhcp /var/lib/dhcp/dhcpd.leases*;      exec dhcpd -user dhcpd -group dhcpd -f -4 -pf /run/dhcp-server/dhcpd.pid -cf $CONFIG_FILE $INTERFACES (code=exited, status=1/FAILURE)

  Process: 6979 ExecStartPre=/bin/chown dhcpd:dhcpd /run/dhcp-server (code=exited, status=0/SUCCESS)

 Main PID: 6982 (code=exited, status=1/FAILURE)



Nov 03 15:27:57 ubuntu systemd[1]: isc-dhcp-server.service: Main process exited, code=exited, status=1/FAILURE

Nov 03 15:27:57 ubuntu systemd[1]: isc-dhcp-server.service: Unit entered failed state.

Nov 03 15:27:57 ubuntu systemd[1]: isc-dhcp-server.service: Failed with result 'exit-code'.

Nov 03 15:27:57 ubuntu sh[6982]: Configuration file errors encountered -- exiting

Here is my dhcp.config:

    timeout 300;

authoritative; #keine Rogue-DHCP-Server

one-lease-per-client true; #nur ein lease pro client

get-lease-hostnames true; # Tell the server to look up the host name in DNS

#option domain-name "psa-team06.informatik.tu-muenchen.de"; 

#option domain-name-servers 192.168.6.1;

#option subnet-mask 255.255.255.0;



default-lease-time 3600;

max-lease-time 86400;

#log-facility local0;



interface eth1;



#ping-check true; #evtl noch auskommentieren







# Unser Subnetz

subnet 192.168.6.0 netmask 255.255.255.0 {

        range 192.168.6.100 192.168.6.250;

        option routers 192.168.6.3;

        }



host VM1{

        hardware ethernet 08:00:27:24:41:79;

        fixed-adress 192.168.6.3;

        option host-name "VM1";

        }

my /etc/default/isc-dhcp-server:

# Defaults for isc-dhcp-server initscript

# sourced by /etc/init.d/isc-dhcp-server

# installed at /etc/default/isc-dhcp-server by the maintainer scripts



#

# This is a POSIX shell fragment

#



# Path to dhcpd's config file (default: /etc/dhcp/dhcpd.conf).

#DHCPD_CONF=/etc/dhcp/dhcpd.conf



# Path to dhcpd's PID file (default: /var/run/dhcpd.pid).

#DHCPD_PID=/var/run/dhcpd.pid



# Additional options to start dhcpd with.

#   Don't use options -cf or -pf here; use DHCPD_CONF/ DHCPD_PID instead

#OPTIONS=""



# On what interfaces should the DHCP server (dhcpd) serve DHCP requests?

#   Separate multiple interfaces with spaces, e.g. "eth0 eth1".

INTERFACES="eth1"

and my ip a:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000

    link/ether 08:00:27:5a:70:a3 brd ff:ff:ff:ff:ff:ff

    inet 10.0.2.15/24 brd 10.0.2.255 scope global eth0

       valid_lft forever preferred_lft forever

    inet6 fe80::a00:27ff:fe5a:70a3/64 scope link

       valid_lft forever preferred_lft forever

3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000

    link/ether 08:00:27:79:73:5d brd ff:ff:ff:ff:ff:ff

    inet 192.168.6.3/24 brd 192.168.6.255 scope global eth1

       valid_lft forever preferred_lft forever

    inet 192.168.61.1/24 brd 192.168.61.255 scope global eth1

       valid_lft forever preferred_lft forever

    inet 192.168.62.1/24 brd 192.168.62.255 scope global eth1

       valid_lft forever preferred_lft forever

    inet 192.168.63.1/24 brd 192.168.63.255 scope global eth1

       valid_lft forever preferred_lft forever

    inet 192.168.65.1/24 brd 192.168.65.255 scope global eth1

       valid_lft forever preferred_lft forever

    inet 192.168.76.2/24 brd 192.168.76.255 scope global eth1

       valid_lft forever preferred_lft forever

    inet 192.168.86.2/24 brd 192.168.86.255 scope global eth1

       valid_lft forever preferred_lft forever

    inet 192.168.106.2/24 brd 192.168.106.255 scope global eth1

       valid_lft forever preferred_lft forever

    inet 192.168.116.2/24 brd 192.168.116.255 scope global eth1

       valid_lft forever preferred_lft forever

    inet 192.168.126.2/24 scope global eth1

       valid_lft forever preferred_lft forever

    inet6 fe80::a00:27ff:fe79:735d/64 scope link

       valid_lft forever preferred_lft forever

root@ubuntu:~#

Strange, strange, strange...

I get it working after i copied a default config file and edited our network into it.

Helpful for debugging are /usr/sbin/dhcpd -t and -f

Here is my config now:

default-lease-time 60;                                                                                                                                         

max-lease-time 240;                                                                                                                                            

authoriative;                                                                                                                                             

option domain-name "psa-team06.informatik.tu-muenchen.de";                                                                                                      

option domain-name-servers router.psa-team1.informatik.tu-muenchen.de;                                                                                       

authoriative;



subnet 192.168.6.0 netmask 255.255.255.0 {                                                                                              

  option broadcast-address 192.168.6.255;                                                                                                                       

  option routers 192.168.6.3;    

    range 192.168.6.100 192.168.6.200;

} 



host VM1 {                                                                                                                                                      

  hardware ethernet 08:00:27:24:41:79;                                                                                                                          

  fixed-address 192.168.6.3;                                                                                                                                    

}

This is not a defined configuration word:

interface eth1;

I couldn't find it in man dhcpd.conf at least not for isc-dhcp-server. I have tried it in my VBox 16.04 server, dhcpd fails.

Not sure from where you got it, but may be you mistakenly meant: INTERFACES="eth1" from /etc/default/isc-dhcp-server which a configuration for the init service and it is used an command-line argument for dhcpd. Check pgrep -a dhcpd.