The NSX Tier-1 Gateway router must be configured to advertise a hop limit of at least 32 in Router Advertisement messages for IPv6 stateless auto-configuration deployments.
An XCCDF Rule
Description
<VulnDiscussion>The Neighbor Discovery protocol allows a hop limit value to be advertised by routers in a Router Advertisement message being used by hosts instead of the standardized default value. If a very small value was configured and advertised to hosts on the LAN segment, communications would fail due to the hop limit reaching zero before the packets sent by a host reached its destination.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-263425r978042_rule
- Severity
- Info
- References
- Updated
Remediation - Manual Procedure
To configure the Neighbor Discovery hop limit, do the following:
From the NSX Manager web interface, go to Networking >> Connectivity >> Tier-1 Gateways >> edit the target Tier-1 gateway.
Expand Additional Settings and select an "ND Profile" from the drop down with a hop limit of 32 or more, then click "Close Editing".