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The administrator must ensure that the maximum hop limit is at least 32.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-30617 | NET-IPV6-059 | SV-40390r1_rule | Low |
| Description |
|---|
| The Neighbor Discovery protocol allows a hop limit value to be advertised by routers in a Router Advertisement message to be 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 hop limit reaching zero before the packets sent by a host reached its destination. |
| STIG | Date |
|---|---|
| Infrastructure Router - Juniper Security Technical Implementation Guide | 2017-09-28 |
Details
| Check Text ( C-39254r1_chk ) |
|---|
| Review the router or multi-layer switch configuration to determine if the default maximum hop limit has been configured. If it has been configured, then it must be set to at least 32. protocols { … … router-advertisement { interface [fe-1/1/1 fe-1/1/2] { current-hop-limit 128; } … } } Note: The JUNOS default is 64. Hence, if the hop limit is not configured, the router will be in compliance with the requirement. |
| Fix Text (F-34363r2_fix) |
|---|
| Configure maximum hop limit to at least 32. |