The DHCP client must be disabled if not needed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-38679	RHEL-06-000292	SV-50480r4_rule		Medium

Description
DHCP relies on trusting the local network. If the local network is not trusted, then it should not be used. However, the automatic configuration provided by DHCP is commonly used and the alternative, manual configuration, presents an unacceptable burden in many circumstances.

STIG	Date
Red Hat Enterprise Linux 6 Security Technical Implementation Guide	2019-09-25

Details

Check Text ( C-46242r4_chk )
IIf DHCP is required by the organization, this is Not Applicable. For each interface [IFACE] on the system (e.g. eth0), verify that DHCP is not being used: Note: This requirement does not apply to the local loopback interface. # cat /etc/sysconfig/network-scripts/ifcfg-[IFACE] \| grep -i “bootproto” \| grep –v “#” BOOTPROTO=none If no output is returned this is a finding. If BOOTPROTO is not set to ”none”, this is a finding.

Check Text ( C-46242r4_chk )

IIf DHCP is required by the organization, this is Not Applicable.

For each interface [IFACE] on the system (e.g. eth0), verify that DHCP is not being used:

Note: This requirement does not apply to the local loopback interface.

# cat /etc/sysconfig/network-scripts/ifcfg-[IFACE] | grep -i “bootproto” | grep –v “#”

BOOTPROTO=none

If no output is returned this is a finding.
If BOOTPROTO is not set to ”none”, this is a finding.

Fix Text (F-43628r2_fix)
For each interface [IFACE] on the system (e.g. eth0), edit "/etc/sysconfig/network-scripts/ifcfg-[IFACE]" and make the following changes. Correct the BOOTPROTO line to read: BOOTPROTO=none Add or correct the following lines, substituting the appropriate values based on your site's addressing scheme: NETMASK=[local LAN netmask] IPADDR=[assigned IP address] GATEWAY=[local LAN default gateway]