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


Overview

Finding ID Version Rule ID IA Controls Severity
V-22415 GEN003608 SV-45725r1_rule Medium
Description
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.
STIG Date
SUSE Linux Enterprise Server v11 for System z 2016-12-20

Details

Check Text ( C-43092r1_chk )
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 (F-39123r1_fix)
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