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← Back to SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

V-22415

CAT II (Medium)

Proxy Address Resolution Protocol (Proxy ARP) must not be enabled on the system.

Rule ID

SV-45725r1_rule

STIG

SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

Version

V1R12

CCIs

CCI-001551

Discussion

Proxy ARP allows a system to respond to ARP requests on one interface on behalf of hosts connected to another interface. If this function is enabled when not required, addressing information may be leaked between the attached network segments.

Check Content

Verify the system does not use proxy ARP.


# grep [01] /proc/sys/net/ipv4/conf/*/proxy_arp|egrep "default|all"

If all of the resulting lines do not end with "0", this is a finding.

Fix Text

Configure the system to not use proxy ARP.
Edit /etc/sysctl.conf and add a setting for "net.ipv4.conf.all.proxy_arp=0" and "net.ipv4.conf.default.proxy_arp=0".
# sysctl -p