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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
ServerIron ADX Security Guide 79
53-1002440-03
ACLs and ICMP
2
Syntax: show access-list <acl-num> | <acl-name> | all
To clear the flow counters for ACL 100.
ServerIronADX# clear access-list 100
Syntax: clear access-list <acl-num> | <acl-name> | all
ACLs and ICMP
This section describes how ACLs can be used to filter traffic based on ICMP packets.
Using flow-based ACLs to filter ICMP packets based on the IP packet
length
To configure an extended ACL that filters based on the IP packet length of ICMP packets, enter
commands such as the following.
ServerIronADX(config)#access-list 105 deny icmp any any echo ip-pkt-len 92
ServerIronADX(config)#access-list 105 deny icmp any any echo ip-pkt-len 100
ServerIronADX(config)#access-list 105 permit ip any any
The commands in this example deny (drop) ICMP echo request packets that contain a total length
of 92 or 100 in the IP header field. You can specify an IP packet length of 1 – 65535. Refer to the
section “ICMP filtering with flow-based ACLs” on page 79 for additional information on using ICMP
to filter packets.
ICMP filtering with flow-based ACLs
Most Brocade software releases that support flow-based ACLs filter traffic based on the following
ICMP message types:
• echo
• echo-reply
• information-request
• mask-reply
• mask-request
• parameter-problem
• redirect
• source-quench
• time-exceeded
• timestamp-reply
• timestamp-request
• unreachable
ServerIronADX# show access-list 100
Extended IP access list 100 (Total flows: 432, Total packets: 42000)
permit tcp 1.1.1.0 0.0.0.255 any (Flows: 80, Packets: 12900)
deny udp 1.1.1.0 0.0.0.255 any (Flows: 121, Packets: 20100)
permit ip 2.2.2.0 0.0.0.255 any (Flows: 231, Packets: 9000)