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utility switching and load balancing are critical for scaling closely used databases, net server farms and IP-primarily based networks. site visitors management home equipment often contain some sort of inspection at layers 2 through 7, SSL acceleration and excessive-availability failover alternate options.
F5 Networks, a giant in the world of site visitors administration, identified that load balancers can play a big function in an enterprise's security framework. With that in intellect, it beefed up its large-IP 5000 series utility swap with a couple of new points that complement and raise existing safety options.
A FIPS one hundred forty-2 degree 3 certified equipment, big-IP is a supercharged 24-port 10/a hundred switch with 4 gigabit fiber ports. Powered through Broadcom ASICs that work as a change-on-a-chip and contain their own reminiscence, huge-IP's speeds and feeds are fantastic. The swap textile is in a position to eight Gbps in a single path and 16 Gbps aggregate. Even the usage of gigabit connections and a packet generator, i was unable to attain the field's theoretical performance limits.
massive-IP can quite simply terminate greater than 800 SSL sessions, which includes session setups and bulk encryptions. With software add-ons, it might probably handle 800 transactions per 2nd (together with the backend SSL connection requests). it will keep certificates from a CA or generate brief certificates. or not it's an striking piece of hardware, but it's huge-IP's utility--now at version 4.5--that separates it from other switches.
built-in protection functionality
The F5's universal Inspection Engine (UIE) and built-in suggestions--or "iRules"--power huge-IP's new utility kit. These points allow large-IP to investigate cross-check, swap and keep client connections in accordance with any portion of the HTTP header.
Most load balancers that do normal layer 7 switching can best investigate cross-check the HTTP header or assess cookies. UIE can investigate cross-check any a part of the header or payload, and can make switching choices according to rule matching. for example, UIE routes site visitors to a suitable utility by using attempting to find certain XML tags; or it may lighten the weight on SQL databases via splitting facts writing and reading amongst different servers.
iRules are used to help large-IP come to a decision how traffic is balanced. They examine TCP guidance to admin-created signatures, which then trigger a routing action. for example, security admins can create iRules for discovering and filtering Nimda or Slammer worm traffic.
previous to v4.5, huge-IP's decision-making method was textual content based mostly and never a lot distinctive from competing solutions. Now, large-IP's UIE can investigate cross-check plenty deeper--looking at the protocol, port and the payload--for bytes with specific offsets, substrings and fields. This combination of the UIE and iRules offers the big-IP a superb deal of flexibility for load balancing firewalls and IDS instruments.
And whereas the ability to investigate cross-check payloads can also overlap into the performance of a rudimentary IDS, lookups simplest happen on the first 16K of data, seeing that providing a full proxy--akin to found in firewalls--is just too intensive for a load balancer. large-IP's center of attention continues to be quickly switching--notably at the utility layer.
huge-IP complements present protection solutions with its clever Port Mirroring. devoid of disrupting traffic circulation, massive-IP can direct site visitors to the appropriate protection device for intrusion detection, electronic mail scanning, virus checking and different application-stage protection services.
massive-IP allows organisations to "pool" varied backend materials into a single digital server (corresponding to an internet server farm) for processing effectivity. The appliance directs traffic to designated swimming pools via its 16 algorithms--including round robin, ratio, least connections, predictive and quickest node tackle. (F5's TripleDNS add-on module enables for DNS-based load balancing.) as soon as the iRules are dependent, huge-IP can distribute heavy traffic hundreds to certain processing swimming pools--akin to certain IDSes.
agencies can create "clone" pools that reflect established pools, enabling for out-of-band safety processing, comparable to an IDS inspecting traffic it really is already been parsed through its load balancer. This gives massive-IP the ability to function close true-time site visitors inspection on quick connections.
F5 comprises iControl SDK, an open API in line with soap/XML. it's C-like and totally scriptable to perform moves similar to what you'll do within the GUI or command line. The iControl SDK contains code samples with prewritten suggestions that work with selected IDSes and firewalls. With iControl, firms can combine huge-IP with their protection devices, which could share critical counsel using a comfortable variety of cleaning soap (or CORBA) to immediately make rule and configuration alterations in response to feedback despatched to massive-IP. guide activation is additionally an alternative, because it will take a sea alternate before security admins beginning allowing automatic policy changes.
Dynamic rebinding is additionally an outstanding example of iControl's capabilities. big-IP can copy the state table used via OPSEC-licensed firewalls. should that firewall fail, F5 will take the present state desk, stream it to yet another firewall, and rebind state to the next firewall to take over.
Integration performs an important position in network upkeep and availability. devices can inform big-IP that they are going out of provider for application improvements or patch installations. massive-IP will redirect site visitors except they signal that they are back on-line. This feature also is helpful as an intrusion prevention tool, enabling enterprises to direct suspected malicious traffic to a honeypot.
large-IP can play a big function in mitigating denial-of-provider (DoS) attacks. customarily, a swap/router can be set to a low timeout for discarding connections, however the appliance's DoS coverage has assorted settings that work to intelligently reap connections. Even under a simulation of a heavy load, I averaged 10 percent of big-IP's 2 GB reminiscence. however, by way of environment a "low-water mark," and simulating a DDoS attack, i was in a position to set off an aggressive reaping of connections within the SYN state.
as the attack intensified and that i got nearer to the "excessive-water mark," huge-IP got more aggressive and looked at open connections and how lengthy the connection had been open. within 1 to 2 percent of the high-water mark, huge-IP all started terminating idle connections. best by means of growing a huge variety of active classes and via surroundings the excessive-water mark surprisingly low became it viable to attain massive-IP's limit at which it not allows new connections.
a further characteristic that may shop servers from DoS is large-IP's inclusion of "dynamic ratio" load balancing. through taking a look at a server's load the usage of the windows management Instrumentation (WMI) Perfmon agent or by way of SNMP, admins can weight quite a lot of efficiency metrics to assist the massive-IP determine the burden handed to certain servers. F5 offers predefined and customizable scripts for checking out everything from servers to routers.
Inspection and setup is a bit more durable than it must be, often due to interface quirks. F5 provides on-website setting up guide to all customers. however even with F5's engineers' assist, I still stumbled throughout quirks within the net-primarily based interface that led to minor configuration complications. an absence of configuration foolproofing allows admins to incorrectly assign IP addresses and readily lock themselves out of their own system. moreover, big-IP balked when the configuring customer computer ran ZoneAlarm. It took a session with TCP Dump to determine the concern, which became resolved by turning off ZoneAlarm.
With a little elbow grease, organizations can use this high-end load balancer to increase their safety and reap enhanced efficiency from latest safety options.
image: large-IP 5000 sequence utility change v4.5F5 NetworksPrice: $15,000-$32,000
purpose:huge-IP is a supercharged 24-port 10/one hundred swap with four gigabit fiber ports. edition 4.5 performs load balancing, utility switching, SSL administration and different security functions.
time-honored Inspection Engine checks packets on the bit level.
gives SSL acceleration, DoS protection and certificates assist.
iControl provides dynamic interactive control of OPSEC-compliant firewalls and IDSes. APIs attainable for unsupported solutions.
Blazingly speedy switching.
Extensible XML scriptable interface for granular, interactive control.
On-web page setup support supplied as a part of income settlement.
swimming pools and mirrors components to deal with security inspection at excessive speeds and below heavy masses.
a superb cost for the lengthy haul, but can also be expensive to implement.
Minor GUI quirks slowed setup and caused incorrect port handle assignments.
Lack of fool-proofing makes it possible to inadvertently block your personal IP address, that could simply lock you out of your own gadget.
VERDICT:large-IP is an excellent piece of hardware that offers excessive-availability load balancing, quickly and intensely clever layer 7 switching, granular interactive control, DoS insurance policy, resource pooling and a couple of other facets to support give protection to an business's web presence.
about the creator:Scott Sidel, CISSP, is a technical editor for assistance security and a senior security engineer at computer Sciences Corp.
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Application switching and load balancing are crucial for scaling heavily used databases, Web server farms and IP-based networks. Traffic management appliances generally incorporate some form of inspection at layers 2 through 7, SSL acceleration and high-availability failover options.
F5 Networks, a giant in the world of traffic management, recognized that load balancers can play a significant role in an enterprise's security framework. With that in mind, it beefed up its BIG-IP 5000 Series Application Switch with several new features that complement and enhance existing security solutions.
A FIPS 140-2 Level 3 certified appliance, BIG-IP is a supercharged 24-port 10/100 switch with four gigabit fiber ports. Powered by Broadcom ASICs that work as a switch-on-a-chip and contain their own memory, BIG-IP's speeds and feeds are impressive. The switch fabric is capable of 8 Gbps in one direction and 16 Gbps aggregate. Even using gigabit connections and a packet generator, I was unable to reach the box's theoretical performance limits.
BIG-IP can easily terminate more than 800 SSL sessions, which includes session setups and bulk encryptions. With software add-ons, it can handle 800 transactions per second (including the backend SSL connection requests). It will store certificates from a CA or generate temporary certificates. It's an impressive piece of hardware, but it's BIG-IP's software--now at version 4.5--that separates it from other switches.
Built-in Security Functionality
The F5's Universal Inspection Engine (UIE) and integrated rules--or "iRules"--drive BIG-IP's new software package. These features allow BIG-IP to inspect, switch and maintain client connections based on any portion of the HTTP header.
Most load balancers that do standard layer 7 switching can only inspect the HTTP header or examine cookies. UIE can inspect any part of the header or payload, and can make switching decisions based on rule matching. For example, UIE routes traffic to an appropriate application by looking for specific XML tags; or it can lighten the load on SQL databases by splitting data writing and reading among different servers.
iRules are used to help BIG-IP decide how traffic is balanced. They compare TCP information to admin-created signatures, which then trigger a routing action. For instance, security admins can create iRules for finding and filtering Nimda or Slammer worm traffic.
Prior to v4.5, BIG-IP's decision-making process was text based and not much different from competing solutions. Now, BIG-IP's UIE can inspect much deeper--looking at the protocol, port and the payload--for bytes with specific offsets, substrings and fields. This combination of the UIE and iRules gives the BIG-IP a great deal of flexibility for load balancing firewalls and IDS devices.
And while the ability to inspect payloads may overlap into the functionality of a rudimentary IDS, lookups only occur on the first 16K of data, since providing a full proxy--such as found in firewalls--is too intensive for a load balancer. BIG-IP's focus remains fast switching--particularly at the application layer.
BIG-IP complements existing security solutions with its Intelligent Port Mirroring. Without disrupting traffic flow, BIG-IP can direct traffic to the appropriate security device for intrusion detection, e-mail scanning, virus checking and other application-level security services.
BIG-IP allows enterprises to "pool" multiple backend resources into a single virtual server (similar to a Web server farm) for processing efficiency. The appliance directs traffic to specified pools through its 16 algorithms--including round robin, ratio, least connections, predictive and fastest node address. (F5's TripleDNS add-on module allows for DNS-based load balancing.) Once the iRules are established, BIG-IP can distribute heavy traffic loads to specific processing pools--such as specific IDSes.
Enterprises can create "clone" pools that mirror established pools, allowing for out-of-band security processing, such as an IDS inspecting traffic that's already been parsed by its load balancer. This gives BIG-IP the ability to perform near real-time traffic inspection on fast connections.
F5 includes iControl SDK, an open API based on SOAP/XML. It's C-like and fully scriptable to perform actions identical to what you'd do in the GUI or command line. The iControl SDK includes code samples with prewritten rules that work with specific IDSes and firewalls. With iControl, enterprises can integrate BIG-IP with their security devices, which can share critical information using a secure form of SOAP (or CORBA) to automatically make rule and configuration changes based on feedback sent to BIG-IP. Manual activation is also an option, since it will take a sea change before security admins start allowing automated policy changes.
Dynamic rebinding is also a good example of iControl's capabilities. BIG-IP can copy the state table used by OPSEC-certified firewalls. Should that firewall fail, F5 will take the existing state table, move it to another firewall, and rebind state to the next firewall to take over.
Integration plays an important role in network maintenance and availability. Devices can tell BIG-IP that they're going out of service for software upgrades or patch installations. BIG-IP will redirect traffic until they signal that they're back online. This function also is useful as an intrusion prevention tool, enabling enterprises to direct suspected malicious traffic to a honeypot.
BIG-IP can play a significant role in mitigating denial-of-service (DoS) attacks. Typically, a switch/router can be set to a low timeout for discarding connections, but the appliance's DoS protection has multiple settings that work to intelligently reap connections. Even under a simulation of a heavy load, I averaged 10 percent of BIG-IP's 2 GB memory. Nonetheless, by setting a "low-water mark," and simulating a DDoS attack, I was able to trigger an aggressive reaping of connections in the SYN state.
As the attack intensified and I got closer to the "high-water mark," BIG-IP got more aggressive and looked at open connections and how long the connection had been open. Within 1 to 2 percent of the high-water mark, BIG-IP began terminating idle connections. Only by creating a large number of active sessions and by setting the high-water mark unusually low was it possible to reach BIG-IP's limit at which it no longer allows new connections.
Another feature that can save servers from DoS is BIG-IP's inclusion of "dynamic ratio" load balancing. By looking at a server's load using the Windows Management Instrumentation (WMI) Perfmon agent or via SNMP, admins can weight various performance metrics to help the BIG-IP determine the load passed to specific servers. F5 provides predefined and customizable scripts for testing everything from servers to routers.
Inspection and setup is somewhat harder than it needs to be, mostly due to interface quirks. F5 provides on-site installation support to all customers. But even with F5's engineers' help, I still stumbled across quirks in the Web-based interface that caused minor configuration problems. A lack of configuration foolproofing makes it possible for admins to incorrectly assign IP addresses and effectively lock themselves out of their own system. Additionally, BIG-IP balked when the configuring client machine ran ZoneAlarm. It took a session with TCP Dump to work out the issue, which was resolved by turning off ZoneAlarm.
With a little elbow grease, enterprises can use this high-end load balancer to enhance their security and reap greater performance from existing security solutions.
Snapshot: BIG-IP 5000 Series Application Switch v4.5F5 NetworksPrice: $15,000-$32,000
PURPOSE:BIG-IP is a supercharged 24-port 10/100 switch with four gigabit fiber ports. Version 4.5 performs load balancing, application switching, SSL management and other security functions.
Universal Inspection Engine checks packets at the bit level.
Provides SSL acceleration, DoS protection and certificate support.
iControl provides dynamic interactive control of OPSEC-compliant firewalls and IDSes. APIs available for unsupported solutions.
Blazingly fast switching.
Extensible XML scriptable interface for granular, interactive control.
On-site setup support provided as part of sales agreement.
Pools and mirrors resources to handle security inspection at high speeds and under heavy loads.
A good value for the long haul, but can be pricey to implement.
Minor GUI quirks slowed setup and caused incorrect port address assignments.
Lack of idiot-proofing makes it possible to inadvertently block your own IP address, which can effectively lock you out of your own system.
VERDICT:BIG-IP is an amazing piece of hardware that provides high-availability load balancing, fast and extremely intelligent layer 7 switching, granular interactive control, DoS protection, resource pooling and a number of other features to help protect an enterprise's Internet presence.
About the author:Scott Sidel, CISSP, is a technical editor for Information Security and a senior security engineer at Computer Sciences Corp.
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