Category: F5 smtp virtual server configuration

There is also an appendix with manual configuration tables for users who prefer to create each individual object. When the BIG-IP system relieves web servers from tasks such as compression, caching, and SSL processing, each server is able to devote more resources to running applications and can service more user requests.

The iApp template for HTTP applications acts as the single-point interface for building, managing, and monitoring these servers. To take advantage of these modules, they must be licensed and provisioned before starting the iApp template. For more information on licensing modules, contact your sales representative.

You can also configure the BIG-IP system for different system scenarios using the options found in the iApp, as described in this section. The system is placed in the network between the clients and the servers.

f5 smtp virtual server configuration

Incoming requests are handled by the BIG-IP, which interacts on behalf of the client with the desired server or service on the server. This allows the BIG-IP system to provide scalability, availability, server offload, and much more, all completely transparent to the client. To configure the system for this scenario, at a minimum you must answer the following questions with the appropriate answers in the iApp template as shown in the following table.

Typically you would leave this at the default for this scenario Do not use a poolhowever you could create a pool of local servers to use as a fallback in case the WAN becomes unavailable. This deployment guide is intended to help users deploy web-based applications using the BIG-IP system. The majority of this guide describes the iApp template and the different options the template provides for configuring the system for HTTP applications. The iApp template configuration portion of this guide walks you through the entire iApp, giving detailed information not found in the iApp or inline help.

The questions in the UI for the iApp template itself are all displayed in a table and at the same level. In this guide, we have grouped related questions and answers in a series of lists.

Questions are part of an ordered list and are underlined and in italics or bold italics.

f5 smtp virtual server configuration

Options or answers are part of a bulleted list, and in bold. Questions with dependencies on other questions are shown nested under the top level question, as shown in the following example:.

These configuration tables only show the configuration objects and any non-default settings recommended by F5, and do not contain procedures on specifically how to configure those options in the Configuration utility.

In order to use the iApp for HTTP applications, it is helpful to have some information, such as server IP addresses and domain information before you begin. Use the following table for information you may need to complete the template. The table does not contain every question in the template, but rather includes the information that is helpful to have in advance. More information on specific template questions can be found on the individual pages.

Advanced mode allows configuring the BIG-IP system on a much more granular level, configuring specific options, or using your own pre-built profiles or iRules. If they are on different subnets, you need to know if the web servers have a route through the BIG-IP system. If there is not a route, you need to know the number of concurrent connections. You have the option of also using an Intermediate chain certificate as well if required in your implementation. When the BIG-IP system encrypts traffic to the servers, it is acting as an SSL client and by default we assume the servers do not expect the system to present its client certificate on behalf of clients traversing the virtual server.

If your servers expect the BIG-IP system to present a client certificate, you must create a custom Server SSL profile outside of the template with the appropriate certificate and key. F5 recommends using the profiles created by the iApp ; however you also have the option of creating your own custom profile outside the iApp and selecting it from the list.

The iApp gives the option of selecting the following profiles some only in Advanced mode. Any profiles must be present on the system before you can select them in the iApp. Also in advanced mode, the monitor can attempt to authenticate to the web servers as a part of the health check. If you want the monitor to require credentials, create a user account specifically for this monitor that has no additional permissions and is set to never expire.

Account maintenance becomes a part of the health monitor, as if the account is deleted or otherwise changed, the monitor will fail and the servers will be marked down.Image Source — www. It provides general best practices in setting up F5 Big-IP Load balancer to provide proper configuration. Some configurations will vary depending on the environment and use case. This is a general guideline and not to be used as a definitive guide. In this article, we will use the following example, where node1 and node2 both runs only HTTP and Https services.

Enterprise Server IP address: Node 1 — Services — Http and Https 80 and Virtual server receives the request from external users and then directs the traffic to virtual nodes behind the F5 Load Balancer according to the configuration instructions. A Pool is a set of virtual servers or Nodes with running same application and services such as web services. Pool is configured and integrated with Virtual server on F5 Load Balancer. So, any request come to virtual servers, F5 BIG-IP then serves that request to servers that are members of that pool as per load balancing method.

When you need to ensure that server responses always return through the BIG-IP system, or when you want to hide the source addresses of server-initiated requests from external devices, you can implement a SNAT.

The destination node then uses that new source address as its destination address when responding to the request.

SMTP relay control through SNAT using F5 BIG-IP iRules

Because a SNAT causes the server to send the response back through the BIG-IP system, the client sees that the response came from the address to which the client sent the request, and consequently accepts the response. For outbound connectionsthat is, connections initiated by a server node, SNATs ensure that the internal IP address of the server node remains hidden to an external host when the server initiates a connection to that host. Create a http and https Pool containing the three web servers one for http and https.

Fill in the appropriate fields with the following. Click Add for each entry Leave empty Illustrate 1. Fill in the appropriate fields with the following:. We want to reassure our reader stay safe and Healthy. Stay Home and Be Safe.

Standard virtual server behavior when no pool members are available

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Leaving your computer onunattended. Opening email attachment from strangers PC. Not installing anti-virus software. Laptop on the loose 6. Blabber mounts File access open to the world 6.Unofficial - A Certification Exam Resources:.

Unofficial - B Certification Exam Resources:. Version notice:. Before we get into the study points of this section, there is some basic information you should know about virtual servers and the BIG-IP platform. Virtual Server Intro. This means that the device will not accept traffic and process it unless you have configured it to do so.

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Clients on an external network can send application traffic to a virtual server, which then directs the traffic according to your configuration instructions.

The main purpose of a virtual server is often to balance traffic load across a pool of servers on an internal network.

Virtual servers increase the availability of resources for processing client requests. Not only do virtual servers distribute traffic across multiple servers, they also treat varying types of traffic differently, depending on your traffic-management needs. A virtual server can also enable session persistence for a specific traffic type. Finally, a virtual server can apply an iRule, which is a user-written script designed to inspect and direct individual connections in specific ways.

For example, you can create an iRule that searches the content of a TCP connection for a specific string and, if found, directs the virtual server to send the connection to a specific pool or pool member.

A Standard virtual server also known as a load balancing virtual server directs client traffic to a load balancing pool and is the most basic type of virtual server.

When you first create the virtual server, you assign an existing default pool to it. From then on, the virtual server automatically directs traffic to that default pool. To do this, you must perform some additional configuration tasks. A Forwarding IP virtual server is just like other virtual servers, except that a forwarding virtual server has no pool members to load balance. The virtual server simply forwards the packet directly to the destination IP address specified in the client request.

When you use a forwarding virtual server to direct a request to its originally specified destination IP address, Local Traffic Manager adds, tracks, and reaps these connections just as with other virtual servers.


You can also view statistics for a forwarding virtual server. Together, the virtual server and profile increase the speed at which the virtual server processes HTTP requests.

HOW TO: Configure the SMTP Virtual Server for Message Delivery

A Performance Layer 4 virtual server is a virtual server with which you associate a Fast L4 profile. Together, the virtual server and profile increase the speed at which the virtual server processes Layer 4 requests.

When you create a virtual server, you specify the pool or pools that you want to serve as the destination for any traffic coming from that virtual server. You also configure its general properties, some configuration options, and other resources you want to assign to it, such as iRules or session persistence types. In version 4. The order of virtual server precedence was from the highest precedence to the lowest precedence as follows:.

In Version 9. Changes in the order of precedence applied to new inbound connections are in Version Complete details can be found at the following location:. SOL Order of precedence for virtual server matching The BIG-IP system uses the destination address, source address, and service port configuration to determine the order of precedence applied to new inbound connections.

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When a connection matches multiple virtual servers, the BIG-IP system uses an algorithm that places virtual server precedence in the following order:. With the addition of the Source Address matching on the virtual server, you can now have more than one virtual server listening on the same IP:port combination, as long as the source IP filter is different on each listener.

There is a good example in the linked SOL for this section. Although certain client information such as the source IP address or source TCP port, may be re-used on the server side of the connection; the BIG-IP LTM system manages the two sessions independently, making itself transparent to the client and server. A Standard virtual server processes connections using the full proxy architecture. This blueprint topic is related to choosing the correct answer for a scenario type of question.

For most questions like these you must have exposure to supporting the BIG-IP platform in a production environment or understand many of the different issues that may arise around the topic and the best practice method of solving the issue.My Support.

Manual Chapter : Configuring Virtual Servers. Introducing virtual servers with Access Policy Manager. Configuring virtual servers for access policies. Configuring a local traffic virtual server with an access policy.

For web access management, you configure an existing Local Traffic Manager virtual server to use an access policy, or you can create a new virtual server for this purpose. When creating a virtual server, specify that the virtual server is a host virtual server for Access Policy Manager, and not a network virtual server.

In either case, you need only configure a few settings: a unique name for the virtual server, a destination address, and a service port. Important: When you create a virtual server, the BIG-IP system places the virtual server into your current administrative partition. For production deployment of your configuration, you should either edit the clientssl profile to use your imported certificate and key, or create a new profile based on the clientssl profile that uses your own certificate and key.

For more information, see Configuring a clientssl profile. This default profile does not contain a valid SSL server certificate, but it can be used for initial Access Policy Manager evaluation and testing. The following interactions apply to SNAT settings with access policies. You create a virtual server to provide a portal for user logons to Access Policy Manager resources. At a minimum, you must create one virtual server on which your users can log on. To create a virtual server for a secure connection.

The Virtual Server List screen opens. Click Create. The New Virtual Server screen opens. In the Name box, type a name for the virtual server. In the Destination area, select host. In the Address box, type the virtual server host IP address.

If you are configuring a virtual server that will forward traffic to another server or is forwarded to by another server, from the Source Port list, select Change. This option only appears when you select Advanced for the Configuration section.April 23, All PostsExchangeExchange Lets see how to configure it. As a first step your f5 should act as a router. Now whatever is your default gateway Cisco Router or Firewall.

Create a static route to route back the traffic to f5 floating ip. So you are making sure all the traffic via exchange servers goes to f5 and comes via f5. As you have a f5 account. I want to keep the design and configuration minimal so that when you import or replace or upgrade templates. Also note that X-Forward-For is enabled by default on the http profile which will remain untouched.

Choose the fqdn for smtp and choose no authentication required and no message submitted as Exchange will handle the rest.

Anonymous Application relay connectors in Exchange Hope it will help many. As I wasted too much time on this. F5 deployment guides are huge. I will be sharing the F5 asm configurations on my next blog. Save my name, email, and website in this browser for the next time I comment. Redo the same process of choosing the same cert. Now you have a client ssl and server ssl profile. It will be a clean design Choose the maximum number of concurrent users fewer than Choose create new pool and add the mailbox servers Choose the fqdn for smtp and choose no authentication required and no message submitted as Exchange will handle the rest.This implementation describes how to secure SMTP traffic.

When you enable a security check, the system either generates an alarm for, or blocks, any requests that trigger the security check. My Support. Validate incoming mail using several criteria. Inspect email and attachments for viruses. Apply rate limits to the number of messages. Prevent directory harvesting attacks. Reject the first message from a sender, because legitimate senders retry sending the message, and spam senders typically do not. This process is known as greylisting.

The system does not reject subsequent messages from the same sender to the same recipient. Task summary. Enabling anti-virus protection for email You can warn or block against email attachments containing a suspected virus. Modifying associations between service profiles and security profiles Before you can modify associations between service profiles and security profiles, you must have created at least one security profile.

You can review and modify the current associations between the service profiles and the security profiles for each protocol. When the virtual server receives SMTP traffic, the SMTP security profile created in Application Security Manager scans for security vulnerabilities, and then the virtual server can be configured to perform other actions such as load balancing on traffic that passes the scan. Reviewing violation statistics for security profiles You can view statistics and transaction information for each security profile that triggers security violations.

Have a Question? Follow Us. F5 Sites F5. All rights reserved. Policies Privacy Trademarks.When building an email solution it is absolutely critical to avoid becoming an open SMTP relay. Aside from contributing to the spam problem, it can take a long time to get off blacklists such as DNSBLs and be a serious disruption to your business.

This breaks the most common method of relay control, which is to have the SMTP server compare the client IP address against its own list of relay-allowed addresses or subnets. All relaying is denied or — worse — the administrator adds the SNAT address to the relay allow list and your site becomes an open relay. Then all you need to do is configure your backend servers to only allow relay from that SNAT address.

The command in that case is snatpool. Moving the IP restrictions for authorized relay hosts to the F5 load balancer is only part of the solution.

You would have to rely on F5 source IP logging to see who is sending the majority of traffic through the F5 to try and guess who the culprit is. It seems like the default gateway solution, and possibly a back-end SMTP system that respects the X-Forwarded-For type of additional header, is the only solution to maintain the relevant information on the connections to the SMTP relays.

f5 smtp virtual server configuration

Then there is L3 nPath which works even with remote servers. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email.

This is the best solution, and requires reconfiguration of the servers to use the BIG-IP as their route back to clients. The servers can now see the real client IP, and the old methods keep working. The servers may not even be on the same subnet as each other, as may be the case with most DR sites. Use inline bridging. This is not a good solution in my view. Bridging is something you might do when you need to retrofit load balancing to an existing environment without reconfiguring servers or clients.

The solution is complex and non-obvious, and still suffers from the subnetting problem of the routed solution above.

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