TCP backlog queue sizes must be set appropriately.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000366

SV-64457r1_rule TCP backlog queue sizes must be set appropriately.

Vulnerability discussion

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.

Check content

# cat /proc/sys/net/ipv4/tcp_max_syn_backlog If the result is not 1280 or greater, this is a finding.

Fix text

Edit /etc/sysctl.conf and add a setting for "net.ipv4.tcp_max_syn_backlog=1280". Procedure: # sysctl -p

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