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The router must configure the maximum hop limit value to at least the value of 32.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| SRG-NET-000205-RTR-000108 | SRG-NET-000205-RTR-000108 | SRG-NET-000205-RTR-000108_rule | Medium |
| 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 |
|---|---|
| Router Security Requirements Guide | 2013-07-30 |
Details
| Check Text ( C-SRG-NET-000205-RTR-000108_chk ) |
|---|
| Review the router configuration to determine if the maximum hop limit has been configured. If it has been configured, then it must be set to at least 32. If it has not been configured, it must be determined what the default value is. If the maximum hop limit value has not been configured, this is a finding. |
| Fix Text (F-SRG-NET-000205-RTR-000108_fix) |
|---|
| Configure the router maximum hop limit value to at least the value of 32. |