The BIND 9.x server implementation must have fetches-per-server enabled.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-275937 | SRG-APP-000516-DNS-000109 | BIND-9X-002460 | SV-275937r1123965_rule | 2025-07-24 | 3 |
| Description |
|---|
| The fetches-per-server option in BIND 9.x configures a limit on the number of outstanding requests (fetches) allowed for a single DNS server. This rate-limiting mechanism helps protect the BIND 9.x server from being overwhelmed by excessive requests to a specific server, particularly when that server is slow or unresponsive. |
| ℹ️ Check |
|---|
| Verify fetches-per-server is enabled with an organization-defined number. Inspect the named.conf file for the following: options { fetches-per-server <integer> drop ; If fetches-per-server is not enabled and set to drop, this is a finding. |
| ✔️ Fix |
|---|
| Modify the BIND configuration file (/etc/named.conf ). Add the fetches-per-server option to the "options" section of the configuration file. fetches-per-server <integer> drop; After making changes, reload or restart BIND to apply the new settings. |