Resolving host names based on a partial names using name imputing on ProxySG

Products

• ProxySG Software - SGOS

Issue/Introduction

Resolving host names based on a partial names using name imputing on ProxySG.

In some network environments, you may want to resolve host names based on a partial names using name imputing. This is usually the case when you may have to append the internal domain names for successful DNS resolution. On the appliance, you can configure a list of suffixes to help with DNS resolution. In the event that the host name is not found, these suffixes are appended to the host name provided by the client.

Resolution

Name Imputing allows the ProxySG to resolve partial host names using an imputing list.

The ProxySG appliance queries the original hostname before checking imputing suffixes unless there is no period in the hostname. If there is no period in the hostname, imputing is applied first.

The appliance uses name imputing to resolve hostnames based on a partial name specification (DNS name imputing suffix). When the appliance submits a hostname to the DNS server, the DNS server resolves the hostname to an IP
address. The appliance then tries each entry in the name-imputing suffixes list until the name is resolved or it reaches the end of the list. If by the end of the list the name is not resolved, the appliance returns a DNS failure.

For example, if the name-imputing list contains the entries example.com and com, and a user submits the URL http://www.eedept , the appliance resolves the host names in the following order.

www.eedept
www.eedept.example.com
www.eedept.com

The ProxySG uses imputing suffixes in the order displayed in the imputing suffixes list.

You can configure Imputing in the Management Console by going to Configuration>Network>DNS>Imputing.

You can add Imputing suffixes in the CLI using the following command:
SGOS#(config)dns imputing suffix