The NSX-T Tier-0 Gateway Firewall must configure SpoofGuard to block outbound IP packets that contain illegitimate packet attributes.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-251743	SRG-NET-000364-FW-000042	T0FW-3X-000036	SV-251743r810096_rule	2023-06-22	1

Description
If outbound communications traffic is not filtered, hostile activity intended to harm other networks may not be detected and prevented.

ℹ️ Check
From the NSX-T Manager web interface, go to Networking >> Segments and for each Segment, view Segment Profiles >> SpoofGuard. If a Segment is not configured with a SpoofGuard profile that has Port Binding enabled, this is a finding.

✔️ Fix
To create a segment profile with SpoofGuard enabled, do the following: From the NSX-T Manager web interface, go to Networking >> Segments >> Segment Profiles >> Add Segment Profile >> SpoofGuard. Enter a profile name, enable port bindings, and then click "Save". To update a Segments SpoofGuard profile, do the following: From the NSX-T Manager web interface, go to Networking >> Segments and click "Edit" from the drop-down menu next to the target Segment. Expand Segment Profiles, choose the new SpoofGuard profile from the drop-down list, and then click "Save".

✔️ Fix

To create a segment profile with SpoofGuard enabled, do the following: From the NSX-T Manager web interface, go to Networking >> Segments >> Segment Profiles >> Add Segment Profile >> SpoofGuard. Enter a profile name, enable port bindings, and then click "Save". To update a Segments SpoofGuard profile, do the following: From the NSX-T Manager web interface, go to Networking >> Segments and click "Edit" from the drop-down menu next to the target Segment. Expand Segment Profiles, choose the new SpoofGuard profile from the drop-down list, and then click "Save".