Dedicated servers are used as a base to create VPSs. Dedicated server has many benefits and those benefits are utilized by virtual servers. These benefits are very much useful to increase traffic at customer’s website. An online business needs more security and reliability to serve services for longer time and dedicated server has all the features. So dedicated server is preferred for VPSs.

Benefits of VPS hosting:

1) Security

2) Isolation

3) Instantly Upgradeable

4) Dedicated Resources – VPS hosting provides you more disk space and RAM.

5) Flexibility – The freedom to choose the operating system and software you want to install on the server.

Linux VPS hosting offers an inexpensive way to get many of the features, security, reliability and flexibility of a costly dedicated server. It is better that you can search and then complete with any web hosting service provider.

 A reseller hosting is a better option for an individual to earn more from the online market. To provide reliable web hosting services for better reseller business is totally in the hands of the reseller hosting provider. So to find a reliable reseller hosting provider is must to run a reseller hosting business for a long time. Reseller hosting is available in both the web hosting platforms Windows reseller hosting and Linux reseller hosting. It is better to resell Linux web hosting services because it offers more security and reliability features then any other reseller package. Linux is an open source technology and eventually does not require the licensing like windows. The operating system and it updates are easily available with enhanced security features.

In web hosting market there are numerous types of web hosting is available like dedicated server hosting, VPS hosting but Reseller offers a number of changes to earn a good income under our own defined price tag. But remember a customer is totally depends upon you for all his/her doubts so if you want to make a quick reputed reseller image in the global market then put a small team of technical proficients to run a reseller hosting business for long time.

For most online businesses, a shared hosting solution is the ideal way to start. This type of hosting meets most of their requirements within their limited budget. And since the businesses are just establishing their presence online, there is less traffic and the resource requirement is minimal. But soon, most business owners find they have outgrown the services offered by a shared server.

The most common problems businesses face with a shared hosting are:

Limited Resources: You share a designated space on a single server with possibly hundreds of other website owners. This puts constraints on the availability of space, and bandwidth. And if another account on the server starts consuming more than its allotted resources, it affects the performance of the other accounts too. Thus, your website performance and availability can face serious problems in such scenarios.

On the other hand, you completely own a dedicated server- it also has a better configuration in terms of space, bandwidth, and processor speeds.

Security Risks: Sharing your server space with others puts your website at a security risk- Let us face the bitter truth that in shared hosting environment, it is not possible to completely cover all the loop holes. A server is never completely secure and everything that interacts with your server is a threat to you.

A dedicated server is highly secure since you can order a dedicated firewall with your server. Moreover, you can specify the access levels for the ports of your server.

No Customization: You do not have complete access to your server and thus you cannot install your own applications or files on a shared server. You have to make do with whatever your web host has installed on the sever.

Since you completely own a dedicated server, you have full access to the server enabling you to install custom applications and softwares that your website might require to perform smoothly

Backup Hassels: Data backups can be a problem with a shared hosting solution- most of the time, you are responsible for your own data backup unless your hosting company offers a data backup service along with your shared account.

You can order for a backup plan to securely store your data in a remote location or go for a RAID solution to protect your data from being lost.

A dedicated server hosting solution is the perfect answer to the above problems- it offers you the best services in terms of space, bandwidth, processor speeds, uptime, network and power backup, security and data backup services. Find yourself a reputed UK dedicated hosting provider for better services-make sure to check their SLA, terms and conditions and any other policies to make sure you get everything you are looking for.

The term Greylisting is meant to describe a general method of blocking spam based on the behavior of the sending server, rather than the content of the messages. Greylisting does not refer to any particular implementation of these methods. Consequently, there is no single Greylisting product. Instead, there are many products that incorporate some or all of the methods described here.

Greylisting relies on the fact that most spam sources do not behave in the same way as “normal” mail systems. Although it is currently very effective by itself, it will perform best when it is used in conjunction with other forms of spam prevention.

How does Greylisting Work?

Typically, a server employing greylisting will record the three pieces of data known as a “triplet” for each incoming mail message:

The IP address of the connecting host

The envelope sender address

The envelope recipient address(es)

This is checked against the mail server’s internal database. If this triplet has not been seen before (within some configurable period), the email is greylisted for a short time and it is refused with a temporary rejection with a SMTP 4xx error code. The assumption is that since temporary failures are defined in the SMTP-related RFCs, a legitimate server will try again to deliver the email.

The temporary rejection can be issued at different stages of the SMTP dialogue, allowing an implementation to store more or less data about the incoming message. The tradeoff is more work and bandwidth for more exact matching of retries with original messages. Rejecting a message after its content has been received allows the server to store a choice of headers and/or a hash of the message body.

In practice, most greylisting systems do not require an exact match on the IP address and the sender address. Because large senders often have a pool of machines that can send (and resend) email, IP addresses that have the most-significant 24 bits the same are treated as equivalent, or in some cases SPF records are used to determine the sending pool. Similarly, some e-mail systems use unique per-message return-paths, for example variable envelope return path for mailing lists, Sender Rewriting Scheme for forwarded e-mail, Bounce Address Tag Validation for backscatter protection, etc. If an exact match on the sender address is required, every e-mail from such systems will be delayed. Some greylisting systems try to avoid this delay by eliminating the variable parts of the VERP by using only the sender domain and the beginning of the local-part of the sender address.

Why it works

Greylisting is effective because many mass email tools used by spammers will not bother to retry a failed delivery, so the spam is never delivered. A spam sender may retry with a different sender, and possibly a different message, because it has a queue of victims rather than the proper queue of messages that regular mail servers maintain.

In addition, if a spammer does retry a delivery after the waiting period has expired, any one of a number of automated spamtraps will have had a good chance of identifying the spam source and listing both the source and the particular message in their databases. Thus, these subsequent attempts are more likely to be detected as spam by other mechanisms than they were before the greylisting delay.

Advantages of Greylisting

The main advantage from the users’ point of view is that greylisting requires no additional configuration from their end. If the server utilizing greylisting is configured appropriately, the end user will only notice a delay on the first message from a given sender, so long as the sending email server is identified as belonging to the same whitelisted group as earlier messages. If mail from the same sender is repeatedly greylisted it may be worth contacting the mail system administrator with detailed headers of delayed mail.

From a mail administrator’s point of view the benefit is twofold. Greylisting takes minimal configuration to get up and running with occasional modifications of any local whitelists. The second benefit is that rejecting email with a temporary 451 error (actual error code is implementation dependent) is very cheap in system resources. Most spam filtering tools are very intensive users of CPU and memory. By stopping spam before it hits filtering processes, far fewer system resources are used. This allows more layers of spam filtering or higher throughput since greylisting can easily be configured as a first line of defense with SpamAssassin etc. handling messages that go through.

Some greylisting packages support an SQL backend which allows for a distributed multiple-server frontend to be deployed with the same greylisting data on all frontends.

Disadvantages of Greylisting

Perhaps the most significant disadvantage of greylisting is the fact that, like some other spam mitigation techniques, it destroys the near-instantaneous nature of email people have come to expect. A customer of a greylisting ISP can not always rely on getting every email in a pre-determined amount of time. However, the original specification for email states that it is not a guaranteed delivery mechanism and not an instantaneous delivery mechanism. This means that greylisting is a perfectly legitimate process and does not break any protocols or rules. Traditionally, greylisting is very good at flushing out poorly configured mail servers that cannot maintain state, queue email correctly, or retry delivery within a reasonably short time. Mail servers that are properly configured and fully conform to SMTP generally have no problems with greylisting techniques and delays are very small so as not to be a problem.

If mail from a particular frequent sender is sent from any of several mail servers, mail may be delayed unless the greylisting server recognizes the different servers as belonging to the same whitelisted group.

Greylisting delays much of the mail from non-whitelisted mail servers – not just spam – until typical patterns of communication are recorded by the greylisting system. For best results, whitelisting should be used extensively.

Also, legitimate mail might not get delivered if the retry doesn’t come within the time window the greylisting software uses, or if the retry comes from a different IP address than the original attempt. When the source of an email is a server farm or goes out through an anti-spam mail relay service, it is likely that on the retry a server other than the original server will make the next attempt. Since the IP addresses will be different, the recipient’s server will fail to recognize that the two attempts are related and refuse the latest connection as well. This can continue until the message ages out of the queue if the number of servers is large enough. Such server farming techniques can be construed as breaking RFCs detailed above since the original sending machine has absolved itself of the responsibility of mail delivery by tossing it back into the pool, which breaks the state of the mail delivery process. This problem can partially be bypassed by identifying and whitelisting such server farms in advance. However, it is not possible on a distributed network the size of the Internet to maintain a complete list of all such dedicated server farms.

Greylisting can be a particular nuisance with websites that require you to create an account and confirm your email address before you can begin using them. If the sending MTA of the site is poorly configured, greylisting may delay the initial email containing your signup confirmation link, thus introducing a waiting period even though the actual website may have attempted to send out your email confirmation code immediately. Almost all stock configured Sendmail MTAs (sendmail being the most widely deployed MTA on the internet) will retry after a few minutes, leading to typical delays of under 10 minutes in most cases (still dependent on the greylisting configuration). Greylisting is particularly effective in many cases at weeding out misconfigured MTAs, and is gaining in popularity as a very effective anti-spam tool. Those MTAs that do not correctly handle greylisting will, by their very nature, become less numerous over time.

Although dedicated servers are more expensive than the other web hosting services, they are secure and reliable. Dedicated servers are a blessing for the organisation who wants to keep the continuity of the business without disturbing the workflow.

Dedicated servers can easily manage huge amount of traffic and hence reduce the high risk of server crashing or slow down. A dedicated server provides maximum security since the entire server is solely for the enterprise and it is not shared by anyone else.

How can an organisation make its dedicated server work more?

Dedicated serves have some unique features that enable the organisations to make the most of its dedicated servers.

RAM: Random Access Memory is one of the significant features of a dedicated server hosting. RAM is a form of a computer data storage that allows the user to access any memory on the server. More RAM ensures that the server will be fast in processing user’s requests and the loading time for the page will be less. The performance of the server  depends upon the amount of memory (RAM) which is allotted to the server for its use and more the RAM the organisation has on  its dedicated server, the better it is going to perform. For example if the organisation decides to run numerous processes and services on the dedicated servers then they need to have a large amount of memory (RAM) otherwise the application will fail to run or if the required RAM is not available it will lead to a server crash or server slow down which will result in losses. A dedicated server hosting will provide an adequate amount of memory which is needed for the organisation and unlike in a shared server the memory is not shared with anybody therefore there is less risk of server slow down or crash.

Bandwidth: Bandwidth refers to the data transfer rate, which means the amount of data that can transfer from one point to another in a given period.  How does the bandwidth affect the website of the organisation?  When an organisation deploys a dedicated server so they have an unlimited or a large amount of bandwidth, which enables the maximum amount of data to be transferred, and high bandwidth will enable the website to load faster unlike in other web hosting services. A good bandwidth will help the organisation to manage the website traffic effectively.

RAID: Redundant Array of Independent Disk (RAID) now RAID configuration is one of the significant reasons for the organisation to select dedicated hosting over the other web hosting. RAID 0 enhances the performance of the disk in a server by combining 2or more physical hard drives into a single drive it acts like a backup application for the data. RAID 1 is designed to provide security of the data which is stored on a dedicated server- in this the data which is stored in one disk is mirrored onto a second hard drive so that if the primary hard drive fails there is another drive available for the use that will be a carbon copy of a failed drive it act as a backup application as well as security. Although the RAID configuration is costly but it provides the best solution for the data backup.

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