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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
52 ServerIron ADX Security Guide
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Types of IP ACLs
2
• If you want to secure access in environments with many users, you might want to configure
ACLs that consist of explicit deny entries, then add an entry to permit all access to the end of
each ACL. The software permits packets that are not denied by the deny entries.
Types of IP ACLs
Rule-based ACLs can be configured as standard or extended ACLs. A standard ACL permits or
denies packets based on source IP address. An extended ACL permits or denies packets based on
source and destination IP address and also based on IP protocol information.
Standard or extended ACLs can be numbered or named. Standard numbered ACLs have an idea of
1 – 99. Extended numbered ACLs are numbered 100 – 199. IDs for standard or extended ACLs can
be a character string. In this document, ACLs with a string ID is called a named ACL.
ACL IDs and entries
ACLs consist of ACL IDs and ACL entries:
• ACL ID – An ACL ID is a number from 1 – 99 (for a standard ACL) or 100 – 199 (for an extended
ACL) or a character string. The ACL ID identifies a collection of individual ACL entries. When you
apply ACL entries to an interface, you do so by applying the ACL ID that contains the ACL entries
to the interface, instead of applying the individual entries to the interface. This makes applying
large groups of access filters (ACL entries) to interfaces simple.
NOTE
This is different from IP access policies. If you use IP access policies, you apply the individual
policies to interfaces.
• ACL entry – An ACL entry are the filter commands associated with an ACL ID. These are also
called “statements”. The maximum number of ACL entries you can configure is a system-wide
parameter and depends on the device you are configuring. You can configure up to the
maximum number of entries in any combination in different ACLs. The total number of entries
in all ACLs cannot exceed the system maximum.
• Layer 3 switch code on devices can support up to 4096 ACL entries.
You configure ACLs on a global basis, then apply them to the incoming or outgoing traffic on
specific ports. You can apply only one ACL to a port’s inbound traffic and only one ACL to a port’s
outbound traffic. The software applies the entries within an ACL in the order they appear in the
ACL’s configuration. As soon as a match is found, the software takes the action specified in the ACL
entry (permit or deny the packet) and stops further comparison for that packet.
Support for up to 4096 ACL entries
You can configure up to 4096 ACL entries on devices that have enough space to hold a
startup-config file that contains the ACLs.
For system-max configuration of 4096 ACL rules, the Ip access-group max-l4-cam parameter must
be set to 4096. To configure the maximum ACL rule limit of 4096 ACL rules, the following must be
set: