Cisco NX-OS
TMA-CISCO-NXOS-3.2.3
Disable Proxy ARP on all Layer 3 Interfaces
Description
Proxy ARP is the technique in which one host, usually a router, answers ARP requests intended for another machine on a different network segment (vlan or subnet). By faking its identity, the router accepts responsibility for routing packets to the real destination. Audited against the output of 'show running-config' (run 'terminal length 0' first; do not use 'show running-config all', which adds default values).
How it is checked
Audit method: Configuration pattern
- Pattern
(?m)^[ \t]*ip (?:local-)?proxy-arp\b
How it is fixed
Fix method: Guidance or infrastructure patch
! Proxy ARP is disabled on all interfaces by default, and that configuration does not appear in the running or saved configuration. Proxy ARP only appears in the configuration if it is enabled (which is not desired in most cases). To disable this on an interface if it is enabled: no ip proxy-arp for instance: int vlan 9 no ip proxy-arp
Properties
- Operating systems
- Any
- Tags
- cisco-nxosnetworkhardening
- Reference
- CIS Cisco NX-OS Benchmark v1.2.0 - 3.2.3 Disable Proxy ARP on all Layer 3 Interfaces
Check this host
Run this on a machine you are allowed to audit. The scan is read-only.
tmaegis scan --target cisco-nxos