Internet infrastructure survey
A system for surveying Internet access quality includes a nameserver, registered to be authoritative for a domain name and configured to receive a DNS query to resolve a pseudo-hostname and to extract from the pseudo-hostname an access quality indicator, and a web portal configured to transmit a data survey code to a web browser, the data survey code being configured to access a resource, to determine the access quality indicator responsively to the resource access, to generate the pseudo-hostname including the access quality indicator and the domain name, and to initiate the DNS query.
1. A method for surveying Internet access quality, comprising:
receiving at a DNS nameserver a DNS query for the resolution of a pseudo-hostname, wherein the pseudo-hostname is a fully qualified domain name (FQDN) that comprises an indicator of an access quality measurement and a parameter identifying an infrastructure associated with the access quality measurement;
extracting, from the pseudo-hostname, data including the indicator of the access quality measurement and the parameter identifying the infrastructure associated with the access quality measurement; and
generating an access quality profile using the extracted data.
2. The method of claim 1 , further comprising:
conveying the access quality profile to a requester.
3. The method of claim 2 , further comprising determining a preferred Internet access route responsively to the profile.
4. The method of claim 3 , wherein determining a preferred Internet access route comprises determining an infrastructure at which a web client accesses a resource.
5. The method of claim 1 , wherein the access quality profile is specific to an infrastructure.
6. The method of claim 1 , wherein the access quality profile is specific to a client region.
7. The method of claim 1 , wherein the indicator is a first indicator, and wherein generating an access quality profile comprises:
receiving at the nameserver one or more additional DNS queries providing one or more additional respective indicators of access quality measurements; and
calculating an average of the first indicator and the one or more additional indicators.
8. The method of claim 1 , wherein the indicator is a first indicator, and wherein generating an access quality profile comprises:
receiving at the nameserver one or more additional DNS queries providing one or more additional respective indicators of access quality measurements; and
calculating a difference of the first indicator and the one or more additional indicators.
9. The method of claim 1 , wherein the indicator is a first indicator, and wherein generating an access quality profile comprises:
receiving at the nameserver one or more additional DNS queries providing one or more additional respective indicators of access quality measurements;
measuring times preceding receipt of the first DNS query and each of the one or more additional DNS; and
calculating a time-weighted average of the first indicator and the one or more additional indicators.
10. The method of claim 1 , wherein the type of the access quality indicated is one of a set of access quality types including: a round trip time of Internet communications, a connection delay time, a transmission speed, a variability of transmission speed, a communications error rate, and an availability of a resource.
11. The method of claim 1 , wherein receipt of the DNS query is an indication that access quality has changed.
12. A method for surveying Internet access quality, comprising:
transmitting a code to a web client, wherein the code is configured:
to execute at the web client to determine an indicator of measured access quality, the determining comprising:
issuing a request for a resource; and
obtaining the measured access quality from a time delay associated with the request;
to create a pseudo-hostname that is a fully qualified domain name (FQDN) which combines the indicator of measured access quality and a domain name; and
to initiate a DNS query to resolve the pseudo-hostname.
13. The method of claim 12 , wherein the obtaining comprises measuring a type of access quality with respect to a response.
14. The method of claim 13 , wherein the type of access quality measured is one of a set of types of access quality including: a round trip time of Internet communication, a connection delay time, a transmission speed, or a variability of transmission.
15. The method of claim 12 , wherein the resource is accessed from a cache at an infrastructure and wherein the code is configured to issue the request for the resource by issuing two requests for the resource and adding a randomly generated resource parameter to each request.
16. The method of claim 12 , wherein the resource is a first resource and the code is configured to initiate the DNS query by requesting a second resource at an address specified by the pseudo-hostname.
17. The method of claim 12 , wherein the web client is a web browser and wherein the code is configured to run within the web browser in a manner that is transparent to a user of the web browser.
18. The method of claim 12 , wherein the code is configured to round the access quality measurement to a lower precision such that the DNS request to resolve the pseudo-hostname may be resolved by a resolver.
19. A method for surveying Internet access quality, comprising:
issuing a request for a resource;
obtaining a response or a time-out for the request;
generating an access quality measurement based on the response or on the time-out;
creating a pseudo-hostname, which is a fully qualified domain name (FQDN) that encodes the access quality measurement; and
initiating a DNS query to resolve the pseudo-hostname.
20. A system for surveying Internet access quality, comprising:
a nameserver implemented on one or more first computer processors with first memory coupled thereto, the nameserver registered to be authoritative for a domain name and configured to receive a DNS query to resolve a pseudo-hostname and to extract from the pseudo-hostname an indicator of an access quality measurement; and
a web portal implemented on one or more second computer processors with second memory coupled thereto, the web portal configured to transmit a data survey code to a web browser, wherein the data survey code is configured to access a resource, to determine the access quality measurement responsively to the resource access, to generate the pseudo-hostname, which is a fully qualified domain name that includes the indicator of the access quality measurement and the domain name, and to initiate the DNS query;
wherein the data survey code is configured to run within the web browser in a manner that is transparent to a user of the web browser.
21. The system of claim 20 , wherein the DNS query is a first DNS query, and wherein load on the nameserver is reduced by resolution of a second DNS query for the pseudo-hostname, including the same indicator of the access quality measurement as in the first DNS query, in a resolver cache.