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TCP backlog queue sizes must be set appropriately.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-23741 | GEN003601 | SV-45720r1_rule | Medium |
| Description |
|---|
| To provide some mitigation to TCP Denial of Service attacks, the TCP backlog queue sizes must be set to at least 1280 or in accordance with product-specific guidelines. |
| STIG | Date |
|---|---|
| SUSE Linux Enterprise Server v11 for System z | 2017-08-25 |
Details
| Check Text ( C-43087r1_chk ) |
|---|
| # cat /proc/sys/net/ipv4/tcp_max_syn_backlog If the result is not 1280 or greater, this is a finding. |
| Fix Text (F-39118r1_fix) |
|---|
| Edit /etc/sysctl.conf and add a setting for "net.ipv4.tcp_max_syn_backlog=1280". Procedure: # echo "net.ipv4.tcp_max_syn_backlog=1280" >> /etc/sysctl.conf # sysctl -p |