Contents - HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual

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ProCurve Secure Router OS Firewall-
Protecting the Internal, Trusted Network

Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Advantages of an Integrated Firewall . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Stateful-Inspection Firewalls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Packet-Filtering Firewall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Circuit-level Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Application-level Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Attack Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
SYN-flood Attacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
WinNuke Attacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Reflexive Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Event Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Configuring Attack Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Enabling the Secure Router OS Firewall . . . . . . . . . . . . . . . . . . . . . . . 4-14
Enabling and Disabling Optional Attack Checks . . . . . . . . . . . . . . . . 4-15
Checking Reflexive Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Configuring Stealth Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Configuring ALGs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Enabling the FTP ALG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Enabling the SIP ALG for Voice over IP . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Enabling the PPTP ALG for VPNs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
Enabling Firewall Traversal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
4
4-1

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