I need help with a DHCP server on CentOS7

Posted on October 20, 2016

I’m having problems initializing the DHCP server, i got the follwing files:

/etc/sysconfig/network-scripts/ifcg-enp17s0

HWADDR=00:1F:29:EA:FF:48
TYPE=Ethernet

BOOTPROTO=static

DEFROUTE=yes

IPV4_FAILURE_FATAL=no

IPV6INIT=yes

IPV6_AUTOCONF=yes

IPV6_DEFROUTE=yes

IPV6_FAILURE_FATAL=no

NAME=enp17s0

UUID=7b883e1a-13ac-444b-96d8-52f01f5f4749

ONBOOT=yes

PEERDNS=yes

PEERROUTES=yes

IPV6_PEERDNS=yes

IPV6_PEERROUTES=yes

IPADDR=192.168.100.1

NETMASK=255.255.255.0

NETWORK=192.168.100.0

/etc/dhcp/dhcpd.conf

#
# DHCP Server Configuration file.

#   see /usr/share/doc/dhcp*/dhcpd.conf.example

#   see dhcpd.conf(5) man page
#

ddns-update-style interim;

allow booting;

allow bootp;

authoritative;

ignore client-updates;

set vendorclass = option vendor-class-identifier;

subnet 192.168.100.0 netmask 255.255.255.0 
{

	interface 			enp17s0;
       	option routers                  192.168.100.1;

        option domain-name-servers      192.168.100.1;

	option domain-name              "example.com";

        option subnet-mask              255.255.255.0;

        range                           192.168.100.100 192.168.100.254;

        default-lease-time              21600;

        max-lease-time                  43200;

        next-server                     192.168.100.1;
}

/etc/sysconfig/iptables

*nat

:PREROUTING ACCEPT [13036:1967731]

:INPUT ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

:POSTROUTING ACCEPT [0:0]

-A POSTROUTING -o ens1 -j MASQUERADE

COMMIT

# ens1 modem

# enp17s0 local

*filter

:INPUT ACCEPT [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT

-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT

-A INPUT -j REJECT --reject-with icmp-host-prohibited

-A FORWARD -i ens1 -o enp17s0 -m state --state RELATED,ESTABLISHED -j ACCEPT

-A FORWARD -i enp17s0 -o ens1 -j ACCEPT	

-A FORWARD -j REJECT --reject-with icmp-host-prohibited

COMMIT

Anyone knows why it’s not working?

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