# US 2010/0161771 A1 · Internet protocol (ip) address virtualization for terminal server sessions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0161771 A1 - Document ID: US20100161771A1 - Status: Published application - Kind: A1 - Application number: 12/341,523 - Filed: 2008-12-22 - Published: 2010-06-24 - Earliest claimed: 2008-12-22 - Assignees: Microsoft Corporation - Inventors: Huei Wang; NK Srinivas; Ashwin Palekar; Olga B. Ivanova; Costin Hagiu; Rouslan Beletski; Sriram Sampath; Seema J. Lukose - Web page: https://patentgrep.com/patent/US20100161771A1 ## CPC - H04L 61/5014: using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP] - H04L 45/745: Address table lookup; Address filtering - H04L 61/103: across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP] - H04L 65/1045: Proxies, e.g. for session initiation protocol [SIP] - H04L 65/61: for supporting one-way streaming services, e.g. Internet radio - H04L 67/146: Markers for unambiguous identification of a particular session, e.g. session cookie or URL-encoding - H04L 67/51: Discovery or management thereof, e.g. service location protocol [SLP] or web services - H04L 61/4511: using domain name system [DNS] - H04L 67/306: User profiles - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Techniques are disclosed for virtualizing internet protocol (IP) addresses in terminal server sessions. A client component comprises a layer service provider (LSP) and a name service provider (NSP) that intercept a socket call to associate a port with a socket for a terminal server session. The client component queries a server component for a virtual IP address, and the server component determines whether the terminal server session can use a virtual IP address. Where the session can use a virtual IP address, the server returns a virtual IP address and the client component binds the socket call to the virtual IP address. Where the session cannot use a virtual IP address, the server returns an indication of that, and the client component acts as a proxy for that socket call and any future calls for that socket. ## Claims ### Claim 1 A method for virtualizing internet protocol (IP) addresses in terminal server sessions, comprising: intercepting a request to associate a port number and a socket destined for a destination; sending a request for a virtual IP address to an IP virtualization server; receiving a requested virtual IP address; modifying the request to associate the port number and the socket to include the requested virtual IP address; and associating the requested virtual IP address with the socket. ### Claim 2 (depends on 1) The method of claim 1, where the request to associate the port number with the socket is a bind request and is received across a communications network. ### Claim 3 (depends on 1) The method of claim 1, where the request to associate the port number with the socket is a connect request and is received from a local application. ### Claim 4 (depends on 1) The method of claim 1, wherein the request to associate the port number with the socket is received by a layered service provider (LSP). ### Claim 5 (depends on 1) The method of claim 1, wherein the requested virtual IP address is a unique IP address. ### Claim 6 (depends on 1) The method of claim 1, wherein a terminal server session corresponds to the requested virtual IP address. ### Claim 7 (depends on 1) The method of claim 1, wherein an application within the terminal server session corresponds to the requested virtual IP address. ### Claim 8 (depends on 1) The method of claim 1, further comprising: receiving a request to resolve a domain name service (DNS) hostname into an IP address; and returning a machine IP address and the requested virtual IP address. ### Claim 9 (depends on 1) The method of claim 1, further comprising receiving a request to provide host information corresponding to a host name from a host database; and returning a machine IP address and the requested virtual IP address that correspond to the host name from the host database. ### Claim 10 (depends on 1) The method of claim 1, wherein the request is received from a terminal server session. ### Claim 11 (depends on 10) The method of claim 10, wherein the request is received from the terminal server session when the session logs into a host. ### Claim 12 A method for virtualizing internet protocol (IP) addresses in terminal server sessions, comprising: receiving a request from a requester for a virtual IP address; determining whether the requester can use a virtual IP address; and sending a requested virtual IP address to the requester when the requester can use a virtual IP address. ### Claim 13 (depends on 12) The method of claim 12, further comprising: sending an indication that the requester cannot use a virtual IP address to the requester when the requester cannot use a virtual IP address. ### Claim 14 (depends on 12) The method of claim 12, wherein determining includes attempting to retrieve a IP route entry for the best route to the a destination IP address corresponding to the request. ### Claim 15 (depends on 12) The method of claim 12, further comprising: pre-allocating a pool of addresses comprising at least one virtual IP address; and wherein the pool of addresses comprises the requested virtual IP address. ### Claim 16 (depends on 12) The method of claim 12, further comprising: selecting the requested virtual IP address via a dynamic configuration protocol (DHCP). ### Claim 17 (depends on 12) The method of claim 12, further comprising: when a allocating a pool of addresses is not enabled, generating a MAC address that comprises a session ID; sending the MAC address to a DHCP server in a request for a virtual IP address; and receiving the virtual IP address. ### Claim 18 (depends on 12) The method of claim 12, wherein determining whether the requestor can use a virtual IP address includes: determining that the requestor cannot use a virtual IP address when the requestor corresponds to a service process or a system process. ### Claim 19 (depends on 12) The method of claim 12, wherein determining whether the requestor can use a virtual IP address includes: determining that the requestor cannot use a virtual IP address when the requestor is included in an exclude list, the exclude list comprising applications that cannot use a virtual IP address. ### Claim 20 A computer readable storage medium, comprising computer readable instructions that, when executed on a processor perform operations comprising: intercepting a request from a terminal server session to associate a port number and a socket destined for a destination, the request comprising either a bind request or a connect request; sending a request for a virtual IP address to a IP virtualization server, the virtual IP address comprising a unique IP address; receiving the requested virtual IP address when the terminal server session can use the requested virtual IP address; modifying the request to associate the port number and the socket to include the virtual IP address; and associating the virtual IP address with the socket.