Firewall and perimeter testing: ruleset review, egress filtering, segmentation validation, and evasion of filtering controls.
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Discover, fingerprint, and map perimeter and internal filtering devices before testing rules.
Audit firewall rules for over-permissiveness, weak management security, and poor change hygiene.
Test whether outbound traffic is controlled, since weak egress enables exfiltration and C2.
Validate that network zones are properly isolated and cannot be traversed or bypassed.
Test packet- and protocol-level techniques used to slip past firewall and IDS/IPS filtering.