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The Juniper EX switch must be configured to enable IP Source Guard on all user-facing or untrusted access VLANs with active access interfaces.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-253960JUEX-L2-000130SV-253960r1212014_ruleCCI-002385medium
Description
IP Source Guard provides source IP address filtering on an untrusted layer 2 interface to prevent a malicious host from impersonating a legitimate host by assuming the legitimate host's IP address. The feature uses dynamic DHCP snooping and static IP source binding to match IP addresses to hosts on untrusted layer 2 access interfaces. Initially, all IP traffic on the protected access interface is blocked except for DHCP packets. After a client receives an IP address from the DHCP server, or after static IP source binding is configured by the administrator, all traffic with that IP source address is permitted from that client. Traffic from other hosts is denied. This filtering limits a host's ability to attack the network by claiming a neighbor host's IP address.
STIGDate
Juniper EX Series Switches Layer 2 Switch Security Technical Implementation Guide2026-06-03

Related Frameworks

1 mapping across 4 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (13) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

MON-01Continuous Monitoring
1.00
MON-01.1Intrusion Detection & Prevention Systems (IDS & IPS)
1.00
MON-01.3Inbound & Outbound Communications Traffic
1.00
MON-01.4System Generated Alerts
1.00
MON-01.8Security Event Monitoring
1.00
NET-01Network Security Controls (NSC)
1.00
NET-02Layered Network Defenses
1.00
SEA-01Secure Engineering Principles
1.00
SEA-02Alignment With Enterprise Architecture
1.00
CAP-01Capacity & Performance Management
0.50

+3 more (top 10 by confidence shown)

NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (36) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-10Concurrent Session Control
1.00
AC-17(9)Disconnect or Disable Access
1.00
AC-2(4)Automated Audit Actions
1.00
AC-3Access Enforcement
1.00
AC-4Information Flow Enforcement
1.00
AC-6(9)Log Use of Privileged Functions
1.00
AU-12Audit Record Generation
1.00
AU-3Content of Audit Records
1.00
AU-5Response to Audit Logging Process Failures
1.00
CM-11(2)Software Installation with Privileged Status
1.00

+26 more (top 10 by confidence shown)

CCI1 mapping
CCI-002385
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (3) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

DE.CM-01
1.00
PR.IR-01
1.00
PR.IR-04
0.50

Who does this work

12 NICE work roles and 9 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-253960r1212014_chk)

Review the switch configuration to verify that IP Source Guard is enabled on all user-facing or untrusted VLANs with active access interfaces. Configuring IP Source Guard automatically enables DHCP snooping. Devices such as printers, servers, and VoIP phones are under enterprise control and connected to controlled access interfaces (802.1x, Static MAC Bypass, or MAC RADIUS), making them trusted sources in nonuser-facing VLANs. Verify IP Source Guard on user-facing or untrusted VLANs with active access interfaces. user@host> show configuration vlans <untrusted VLAN name> { vlan-id <VLAN ID>; forwarding-options { dhcp-security { ip-source-guard; } } } Note: IP Source Guard depends on DHCP snooping or static MAC address bindings. This check is not applicable to switches configured with user-facing or untrusted VLANs merely for inclusion in trunks (e.g., core or distribution switch without access interfaces assigned to user-facing or untrusted VLANs). If the switch does not have IP Source Guard enabled on all user-facing or untrusted VLANs with active access interfaces, this is a finding.

Fix Text (F-57363r1212013_fix)

Configure the switch to have IP Source Guard enabled on all user-facing or untrusted VLANs with active access interfaces. 1. Enter configuration mode. 2. Configure user-facing or untrusted VLANs with active access interfaces with IP source guard. 3. Commit the configuration. user@host> configure Entering configuration mode user@host# set vlans <untrusted VLAN name> vlan-id <untrusted VLAN ID> user@host# set vlans <untrusted VLAN name> forwarding-options dhcp-security ip-source-guard user@host# commit commit complete