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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
30 ServerIron ADX Security Guide
53-1002440-03
Logging for DoS Attacks
1
Logging for DoS Attacks
The following sections describe how to enable logging of DoS attacks.
Configuration commands
Use the following commands to enable logging of TCP connection rate and attack rate.
Syntax: [no] ip tcp conn-rate <rate> attack-rate <rate>
Syntax: [no] ip tcp conn-rate-change <percentage> attack-rate <percentage>
Syntax: [no] server max-conn-trap <seconds>
Parameters
The conn-rate <rate> parameter specifies a threshold for the number of global TCP connections
per second that are expected on the ServerIron. A global TCP connection is defined as any packet
that requires session processing. For example, 1 SLB, 1 TCS, and 1 SYN-Guard connection would
equal 3 global TCP connections, since there are three different connections that require session
processing.
NOTE
The ServerIron ADX counts only the new connections that remain in effect at the end of the one
second interval. If a connection is opened and terminated within the interval, the ServerIron ADX
does not include the connection in the total for the server.
The attack-rate <rate> parameter specifies a threshold for the number of TCP SYN attack packets
per second that are expected on the ServerIron.
Syslog entries are generated under the following circumstances:
• If the connection rate or attack rate on the ServerIron reaches 80% of the configured
threshold.
• If the connection rate or attack rate is still between 80% and 100% of the configured threshold
6 minutes after the last message.
• If the connection rate or attack rate exceeds 100% of the configured threshold.
• If the connection rate or attack rate exceeds 100% of the configured threshold, and has gone
up by the configured rate change percentage.
• One minute after the last message indicating that the connection rate or attack rate still
exceeds 100% of the configured threshold, and has gone up by the configured rate change
percentage.
• Three minutes after the last message, if the connection rate or attack rate is still between 80%
and 100% of the configured threshold, and has gone up by the configured rate change
percentage.
The server max-conn-trap <seconds> command specifies the number of seconds that elapse
between traps, where <seconds> can be from 1 to 300. The default is 30.
Example
ServerIronADX(config)# ip tcp conn-rate 10000 attack-rate 10000
ServerIronADX(config)# ip tcp conn-rate-change 50 attack-rate 100
ServerIronADX(config)# server max-conn-trap 30