Home Theater Server User Manual
Table Of Contents
- Contents
- About This Document
- Network Security
- TCP SYN attacks
- IP TCP syn-proxy
- Granular application of syn-proxy feature
- Syn-def
- No response to non-SYN first packet of a TCP flow
- Prioritizing management traffic
- Peak BP utilization with TRAP
- Transaction Rate Limit (TRL)
- Understanding transaction rate limit
- Configuring transaction rate limit
- Configuring the maximum number of rules
- Saving a TRL configuration
- Transaction rate limit command reference
- Global TRL
- TRL plus security ACL-ID
- security acl-id
- Transaction rate limit hold-down value
- Displaying TRL rules statistics
- Displaying TRL rules in a policy
- Displaying IP address with held down traffic
- Refusing new connections from a specified IP address
- HTTP TRL
- Overview of HTTP TRL
- Configuring HTTP TRL
- Displaying HTTP TRL
- Display all HTTP TRL policies
- Display HTTP TRL policy from index
- Display HTTP TRL policy client
- Display HTTP TRL policy starting from index
- Display HTTP TRL policy matching a regular expression
- Display HTTP TRL policy client index (MP)
- Display HTTP TRL policy client index (BP)
- Display HTTP TRL policy for all client entries (BP)
- Downloading an HTTP TRL policy through TFTP
- HTTP TRL policy commands
- Logging for DoS Attacks
- Maximum connections
- clear statistics dos-attack
- Maximum concurrent connection limit per client
- Firewall load balancing enhancements
- Syn-cookie threshhold trap
- Service port attack protection in hardware
- Traffic segmentation
- DNS attack protection
- Access Control List
- How ServerIron processes ACLs
- Default ACL action
- Types of IP ACLs
- ACL IDs and entries
- ACL entries and the Layer 4 CAM
- Configuring numbered and named ACLs
- Modifying ACLs
- Displaying a list of ACL entries
- Applying an ACLs to interfaces
- ACL logging
- Dropping all fragments that exactly match a flow-based ACL
- Enabling ACL filtering of fragmented packets
- Enabling hardware filtering for packets denied by flow-based ACLs
- Enabling strict TCP or UDP mode for flow-based ACLs
- ACLs and ICMP
- Using ACLs and NAT on the same interface (flow-based ACLs)
- Displaying ACL bindings
- Troubleshooting rule-based ACLs
- IPv6 Access Control Lists
- Network Address Translation
- Syn-Proxy and DoS Protection
- Understanding Syn-Proxy
- Configuring Syn-Proxy
- DDoS protection
- Configuring a security filter
- Configuring a Generic Rule
- Configuring a rule for common attack types
- Configuring a rule for ip-option attack types
- Configuring a rule for icmp-type options
- Configuring a rule for IPv6 ICMP types
- Configuring a rule for IPv6 ext header types
- Binding the filter to an interface
- Clearing DOS attack statistics
- Clearing all DDOS Filter & Attack Counters
- Logging for DoS attacks
- Displaying security filter statistics
- Address-sweep and port-scan logging
- Secure Socket Layer (SSL) Acceleration
- SSL overview
- SSL acceleration on the ServerIron ADX
- Configuring SSL on a ServerIron ADX
- Basic SSL profile configuration
- Advanced SSL profile configuration
- Configuring Real and Virtual Servers for SSL Termination and Proxy Mode
- Configuration Examples for SSL Termination and Proxy Modes
- SSL debug and troubleshooting commands
- Displaying socket information
2 ServerIron ADX Security Guide
53-1002440-03
Granular application of syn-proxy feature
1
• ServerIron may accept the ACK during 33 seconds to 64 seconds due to the syn-proxy
algorithm, but it does not accept the ACK after 64 seconds.
• If you enter a value for the ip tcp syn-proxy <value> command from the CLI or upgrade from an
older release such as 09.4.x to 09.5.2a with the ip tcp syn-proxy <value> command in the
config file, you receive the following warning message.
Warning: The value 10 is being ignored.
Default ACK validate time of 32 seconds will be used.
To change the MSL value, issue 'server msl <value>'.
Granular application of syn-proxy feature
This feature applies to ServerIron ADX Syn-Proxy. When this feature is enabled, traffic destined to a
virtual server IP is denied if the destination port is not defined under any of the virtual server
definitions.
This feature prevents ServerIron ADX from responding with TCP SYN-ACK to TCP SYN for ports not
defined under VIP.
Use the following command to validate traffic against a configured virtual port.
ServerIronADX(config)# server syn-cookie-check-vport
Syntax: [no] server syn-cookie-check-vport
Syn-def
Introduction
Use SYN-def (also known as SYN-Defense) to protect the hosts behind the ServerIron (not the
ServerIron itself) by the ServerIron to complete the TCP three-way handshake on behalf of a
connecting client. There is no SYN-cookie functionality with SYN-def.
NOTE
SYN-Defense is recommened for only where Direct Server Return (DSR) is used. DSR is not
supported with SYN-proxy and is supported with SYN-def. For non DSR scenarios, use Syn-Proxy only.
show server traffic
Use the show server traffic command to display information about the number of times the
incomplete connection threshold was reached.