Many applications can connect to, or require connection to, remote resources on the Internet. For example, a web browser application allows a user to enter a domain name and then access a host server associated with the domain name. While the user is normally unaware of underlying processes required to connect to the host server, the user's experience is more favorable when these processes occur quickly. Unfortunately, issues like congestion stemming from rising Internet traffic (e.g., due to web innovations, globalization and increasing connectivity to billions of people in emerging markets) can increase significantly the amount of time required for underlying processes and hence diminish the user's experience.
Various exemplary methods, devices, systems, etc., described herein pertain to techniques for client-side management of domain name information that can enhance a user's Internet experience.
An exemplary method includes booting a computing device, in response to the booting, accessing a file that includes domain names and resolving at least one of the domain names by issuing a request to a server where the resolving occurs as a background process. An exemplary method includes receiving a notice to invalidate client DNS resolver cache information for a domain name, accessing a list of client subscribers to an invalidation service for the domain name and issuing an instruction to the client subscribers to invalidate their respective client DNS resolver cache information for the domain name. An exemplary method includes receiving a request to resolve a domain name, resolving the domain name and transmitting information for the resolved domain name and additional information for at least one other domain name. Other methods, devices and systems are also disclosed.
Non-limiting and non-exhaustive examples are described with reference to the following figures:
Various exemplary methods, devices, system, etc., described herein pertain to client-side management of domain name information in a Domain Name System (DNS). Domain name information may be information as included in a DNS Resource Record (RR) and/or other information associated with a domain name. An exemplary client-side mechanism prefetches domain name information as a background process, for example, at boot during empty or unused cycles. Such a mechanism can enhance a user's experience when the user wants to connect to a host server for a domain name that the user connected to in a previous session. For example, the prefetch mechanism can access a persistent record or cache of a user's frequently requested domain names and then resolve at least some of these domain names as a background process during boot. Prefetching ensures that the client resolver cache has fresh information for the domain names and allows the user to connect to one or more appropriate host servers without having to wait for resolution by a DNS server.
Another exemplary mechanism allows for invalidation of client-side domain name information. A client-side DNS cache typically caches a Resource Record for a domain name for a period of time specified by a value, referred to as “time-to-live” (TTL). When the TTL expires, a client-side DNS service (e.g., a resolver or name resolution service) makes a request to re-resolve the domain name. As short TTLs can increase network traffic, TTLs are typically long (e.g., a day). For any of a variety of reasons, relatively instantaneous invalidation of client-side domain name may be desired. An exemplary invalidation mechanism can invalidate client-side domain name information and cause a client DNS service to request fresh information. Alternatively, such a mechanism may simultaneously invalidate and refresh client-side domain name information.
Yet another exemplary mechanism allows for management of information for groups of domain names. In general, a client wants to avoid issuing requests for name resolution as such requests increase network traffic and require action by one or more servers. An exemplary grouping mechanism allows a client to acquire information for more than one domain name when issuing a request for resolution of a single domain name.
An exemplary client architecture optionally includes a failover module that fails over a client application to a new host server. An exemplary client architecture optionally includes an Internet Location Coordinate (ILC) module that operates in conjunction with an ILC enhanced DNS system with beacons that help provide information to participants about their respective “locations” in a network space. A participant in an ILC enhanced DNS system can be any resource on the network (e.g., a client, a server, etc.). In various examples, transmission of location information (e.g., ILCs) can occur via DNS and TXT records; via “Extensions to DNS” (EDNS) and explicit new record types; or entirely outside DNS but applied to select an address returned by a DNS query.
According to the method 108, in a boot block 110, a client computing device (“client”) starts-up and loads “old” DNS information from a file (e.g., written before the client shut down) into the client's DNS resolver cache. In the boot block 110, the boot time is designated T1 and the age of the “old” DNS information is designated T0, though the file will likely contain multiple domain names that were fetched at different times. In a request block 114, the client makes a request to resolve a domain name. In an access block 118, the client accesses its DNS resolver cache, which contains the “old” DNS information. A decision block 122 follows that decides if an IP address exists in the cache for the domain name. If the decision block 122 decides that no IP address exists in the cache, then the client resolves the domain name via a DNS server, per the resolution block 126 (see, e.g., description for method 102). However, if an IP address exists for the domain name in the client-side DNS resolver cache, as preloaded, then the client connects to the associated host server per the connection block 130. In this branch, the domain information will only be considered “fresh” (and hence usable) if T2−T0 is less than the TTL for that domain name, where the TTL was returned along with the domain name's IP addresses in the DNS response message.
According to the method 200, in a boot block 210, a client computing device (“client”) starts-up and loads “old” DNS information from a file into the client's DNS resolver cache. In the boot block 210, the boot time is designated T1 and the age of the “old” DNS information is designated T0. In the example of
At some time after boot, per a request block 214, the client requests resolution of a domain name. At a time T2, where T2 is greater than T1′, the client accesses its DNS resolver cache. A decision block 222 follows that decides if an IP address exists in the resolver cache for the domain name. If the decision block 222 fails to find an IP address, then a resolution block 226 resolves the domain name via a DNS server. According to this branch, the domain name was not amongst the one or more domain names resolved by the background process 211. If the decision block 222 finds an IP address for the domain name in the client's DNS resolver cache, then it is a “fresh” IP address, possibly acquired at time T1′. In other words, if the domain name specified in the request block 214 is a domain name resolved by the background process 211, then the domain name information is no older than T1′.
In comparison to the method 102, the method 200 enhances a user's experience as it can provide for quicker connections to network resources for one or more domain names. In comparison to the method 108, the method guarantees freshness of domain name information for one or more domain names.
The kernel space includes various components that operate in conjunction with a TCP/IP stack 340. Such a stack typically operates via a network driver interface specification (NDIS) to communicate with network resources via frames 390, 392. The TCP/IP stack 340 includes a transport layer, a network layer and a framing layer. As shown, frame 390 carries an IP datagram and frame 392 carries an IP datagram and Internet Location Coordinate (ILC) information (see, e.g.,
The architecture 300 may include the following APIs by which applications, services, or other system components access the TCP/IP stack 340:
A Kernel-Mode API used by KM clients.
Sockets API used by Sockets-based applications and services. The Sockets API operates through an Ancillary Function Driver (AFD) to perform Socket functions with the TCP/IP stack 340.
Transport Driver Interface (TDI) used by NetBIOS over TCP/IP (NetBT) clients and other legacy TDI clients. A translation layer exists between TDI and the TCP/IP stack 340.
The TCP/IP stack 340 exposes an inspection API 350, which provides a consistent, general-purpose interface to perform deep inspection or data modification of packet contents. The Inspection API 350 is part of a filtering platform. The TCP/IP stack 340 provides access to the packet processing path at the Network and Transport layers.
The architecture 300 includes an exemplary failover module 360, which may be configured in any of a variety of manners. For example, the failover module 360 may be configured to directly access information in the TCP/IP stack 340. The module 360 may be configured to use the inspection API 350. The failover module 360 may also be configured to expose an API for user space applications. The failover module 360 may be part of, or function cooperatively with, the DNS service 310. For example, the failover module 360 may be a separate OS service that can retrieve information from the resolver cache 312 or resolver file 314.
The architecture 300 also includes an ILC module 370, which provides for processing Internet Location Coordinate (ILC) information. Such information is described in more detail with respect to
The architecture 300 includes the exemplary prefetch module 380, which may be configured in any of a variety of manners. For example, the prefetch module 380 may be configured to directly access information in the TCP/IP stack 340. The module 380 may be configured to use the inspection API 350. The prefetch module 380 may also be configured to expose an API for user space applications. The prefetch module 380 may be part of, or function cooperatively with, the DNS service 310. For example, the prefetch module 380 may be a separate OS service that can retrieve information from the resolver cache 312 or resolver file 314. Alternatively, another cache or file may be available that maintains information between boots of a client computing device (i.e., a persistent information store).
The prefetch module 380 may be configured to operate in conjunction with the failover module 360 and/or the ILC module 370. For example, the prefetch module 380 may fetch information for use by the failover module 360 and the prefetch module 380 may fetch information based at least in part on ILC information.
The system 400 may depend on time, distance, network traffic, machine workload, bandwidth, etc. To understand better how such a system may be defined, consider a vehicle on a major interstate highway en route to an airport. At various locations along the highway, the state department of transportation transmits information to displays that provide information to vehicle operators. When the vehicle is at a display location, the department of transportation may transmit a travel time message that indicates how many minutes it will take for a vehicle at the display location to reach the airport. Such information is helpful as the vehicle operator may decide to take an alternate route. Further, the reasons for the stated travel time may be irrelevant to the vehicle operator. In other words, the vehicle operator may not care whether the travel time is lengthy due to road construction, holiday traffic, an accident, etc. While the department of transportation may choose to display a specific reason or reasons, such information may not add much value to the information conveyed by a simple travel time in minutes.
As described herein, in various examples, an Internet Location Coordinate (ILC) may be a number, a set of numbers, or a set of numbers where each one is associated with some additional information (e.g., a tuple for each beacon). An ILC may indicate a local position to a client where this position is with respect to a network logical space measuring “travel time” or congestion, and not necessarily geographic location. ILCs may be compared to estimate “travel time” or congestion between participants. Such simplicity is in-line with the DNS and such an ILC may be carried according to an existing DNS protocol.
Referring again to the system 400 of
As mentioned, an ILC participant can be any resource on a network. Hence, the web servers 430_1, 430_2 and 430_3 may be participants that can determine respective ILCs using the beacons 415. For example, the web server 430_1 may transmit packets to the beacons 415_1, 415_2 and 415_3 and receive corresponding return packets. As the web server 430_1 may know, a priori, information about the beacons 415_1, 415_2 and 415_3, it can now determine its position in the system (e.g., its ILC). While the example of
As described herein, the exemplary system 400 allows clients to determine their position in a network logical space. Such information can be used for a variety of purposes. For example, where the web servers 430_1, 430_2 and 430_3 provide essentially identical services, such information can be used to allow the client 420 to connect to the “best” web server (e.g., the “closest” server based on ILCs).
In an entry block 510, a domain name is entered (e.g., www.msn.com). In turn, a DNS server may identify a plurality of servers associated with the domain name, for example, web server 430_1, 430_2 and 430_3. As explained, each of the servers includes an ILC module to ascertain their respective ILCs. In a receipt block 520, the client 420 receives information about the group of servers along with the ILC for each of the servers in the group. In a determination block 530, the client 420 determines the optimal server based on the ILCs for the servers and its own ILC.
In the example of
In the example of
At a later time, a boot block 730 boots the computer. Upon booting, a load block 734 is initiated that loads information from the file. An analysis block 740 analyzes information in the file, for example, to determine a prefetch order, number of domain names to prefetch, etc. A prefetch block 760 prefetches domain name information for one or more domain names (e.g., based at least in part on the analysis). For example, the prefetch block 760 may simply issue one or more domain name resolution requests to a DNS server and return a Resource Record (RR) for each domain name. A load block 780 loads the domain name information to a cache such as a client DNS resolver cache (see, e.g., the cache 312 of
According to the method 940, in a requirement block 942, notice is received for invalidation of client cache information for a domain name. In response, in a call block 944, the server-side invalidation module 992 calls for invalidation of caches of client subscribers. For example, the call block 944 may force client-side TTLs for a particular domain name to be changed to “0”, which, in turn, may cause the client 920 to immediately request new information for the domain name.
In the example of
An exemplary method can include bundling invalidation of information with updated information. For example, if A sends an invalidation instruction to B for invalidating information for a domain name, and A knows that B is going to issue a request to resolve the domain name, A can jump ahead in the process by sending its response (e.g., providing new or updated resolution information for the domain name) along with the invalidation instruction.
The client-side invalidation module 1040 includes a subscription management component 1041 that can subscribe a client or respond to server-side subscription management. A subscription list component 1042 allows a client to create a list of domain names for use by an invalidation service. A DNS cache access component 1043 allows an invalidation service to access a DNS cache for overwriting entries, controlling TTL settings, etc.
The method 1140 commences in a request block 1142 where a client requests resolution of a domain name. In a transmit block 1144, the client 1120 transmits the domain name with cookie information to the DNS server 1107 where the cookie information may be managed by the grouping module 1194. The DNS server 1107 resolves the domain name and the grouping module 1192 analyzes the cookie information to determine if the DN server 1107 should transmit information for one or more additional “group” domain names to the client 1120. Per a construction block 1148, the DNS server 1107 constructs a packet with domain name information for at least the request domain name. In an update block 1150, the client 1120 updates its cache 1112 with the information received from the DNS server 1107.
The client-side grouping module 1240 includes a subscription management component 1241 that can subscribe a client or respond to server-side subscription management. A grouping services component 1242 can allow a user to select URLs, construct filters or specify filter criteria to group domain names, generate cookies, hash group information, etc. A DNS cache access component 1243 allows a grouping service to access a DNS cache for overwriting entries, controlling TTL settings, etc.
An exemplary method for grouping domain names and receiving group information upon issuing a name resolution request can include polling for changes. For example, a client may issue a request for resolution of a domain name and include a poll request for changes associated with a group of domain names. In response a receiving server may determine whether changes have occurred to any members of the group and transmit to the client information for only those members with changes.
An exemplary method optionally operates according to a cookie model where the client and server exchange a cookie. The cookie may be sent from a server to a client upon a request for resolution of a domain name. In turn, the grouping module on the client may store and populate the cookie with group information. Alternatively, a server may send a series of cookies to a client and the client-side grouping module may consolidate the cookies into a group cookie. Upon a request for resolution of a domain name in the group, the client may transmit the group cookie to the server. In turn, the grouping module on the server checks the change status of the domain name information for members of the group and returns updated information as appropriate.
An exemplary method optionally operates on an application specific basis. For example, a client may desire information for an email application and/or a messenger application. In such an example, a single request can update domain name information for both applications. In instances where a user coordinates communications using both applications, the user's experience of both applications can be enhanced.
An exemplary method optionally relies on filtering techniques to define domain name groups. For example, a user that access several governmental agencies may use a filter that includes “.gov” as a criterion. As described herein, other filtering techniques (e.g., with prefixes/suffixes, etc.) may be used. An exemplary method optionally relies on zone information, a SOA record, etc., to define group members.
Various exemplary grouping methods include client-server protocols to communicate information. An exemplary protocol optionally stores information in a packet according to a DNS protocol where a grouping module extracts the information for purposes of grouping domain names or receiving information about domain names in a group. Alternatively, a separate protocol is used where information may be extracted from a DNS packet, cache or file.
In a very basic configuration, computing device 1300 typically includes at least one processing unit 1302 and system memory 1304. Depending on the exact configuration and type of computing device, system memory 1304 may be volatile (such as RAM), non-volatile (such as ROM, flash memory, etc.) or some combination of the two. System memory 1304 typically includes an operating system 1305, one or more program modules 1306, and may include program data 1307. The operating system 1305 include a component-based framework 1320 that supports components (including properties and events), objects, inheritance, polymorphism, reflection, and provides an object-oriented component-based application programming interface (API), such as that of the .NET™ Framework marketed by Microsoft Corporation, Redmond, Wash. The device 1300 is of a very basic configuration demarcated by a dashed line 1308. Again, a terminal may have fewer components but will interact with a computing device that may have such a basic configuration.
Computing device 1300 may have additional features or functionality. For example, computing device 1300 may also include additional data storage devices (removable and/or non-removable) such as, for example, magnetic disks, optical disks, or tape. Such additional storage is illustrated in
The computing device 1300 may also contain communication connections 1316 that allow the device to communicate with other computing devices 1318, such as over a network. Communication connections 1316 are one example of communication media. Communication media may typically be embodied by computer readable instructions, data structures, program modules, or other data forms. By way of example, and not limitation, communication media includes wired media such as a wired network or direct-wired connection, and wireless media such as acoustic, RF, infrared and other wireless media.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
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Number | Date | Country | |
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20090222584 A1 | Sep 2009 | US |