Can i ask for a configuration guide for 1861 router.
You can get the configuration guide for IOS.that will be easy and it is platform independent.what is the IOS version you are running in your router.
Have a look into the below URL for quick start guide for 1861 router
1800 Configuration Guideshttp://www.cisco.com/en/US/products/ps5853/products_installation_and_configuration_guides_list.html
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