Test for SMTP user enumeration (RCPT TO and VRFY), internal spoofing, and relay.
Rebind is a tool that implements the multiple A record DNS rebinding attack. Although this tool was originally written to target home routers, it can be used to target any public (non RFC1918) IP address. Rebind provides an external attacker access to a target router's internal Web interface.
This tool is first an LLMNR and NBT-NS responder, it will answer to *specific* NBT-NS (NetBIOS Name Service) queries based on their name suffix (see: http://support.microsoft.com/kb/163409). By default, the tool will only answers to File Server Service request, which is for SMB. The concept behind this, is to target our answers, and be stealthier on the network.