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-275937r1156959_rule | 2026-05-01 | 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.