Browsing by Author "Amunugama, D"

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Embargo
A Method to Generalize DNS TTL Value Calculation
(IEEE, 2018-08-08) Peiris, N; Amunugama, D; Wijekoon, J
The domain name service (DNS) is the service that resolves IP address(es) for a given fully qualified domain name (FQDN). The DNS is implemented as a hierarchical distributed cache system that stores the IP addresses of the FQDNs for a certain amount of time which is specified in time to live (TTL) value. The TTL value is a arbitrary value set by the authoritative name servers, aka service providers, and hence, the calculation of the TTL value is not defined in any literature the authors referred incurring that calculation of the TTL value is a mysterious part about the DNS service. To this end, this paper proposes a generalized method to calculate the TTL value of the DNS record using the performance of web server (i.e., authoritative name server) where an actual web request has to wait to until it is get served. This paper explains the proposed mathematical method of calculating the TTL values of DNS records and provides a detailed explanation of the used parameters with the reasons of selecting those parameters to calculate the TTL value.
Embargo
On the effectiveness of using network device state information for network path selection
(Elsevier, 2018-01-01) Wijekoon, J; Amunugama, D; Nishi, H
Network path selection defines the methodology of selecting the best routes and forwarding traffic in a network service provider (NSP). NSPs use routing protocols that are optimized for a single arbitrary metric (i.e., administrative weight), which is commonly calculated according to the link state information, to select network paths. Despite the advantages, link-state protocols lack the ability to select network paths by considering the states of network devices such as the effect of routers for network path selection. Apparently, studying possible techniques for selecting network paths based on the state information of network devices, e.g., routers, has become obligatory. This paper studies the effectiveness of using network device state information for network path selection by presenting the Extended Server Link Router state Routing Protocol (ESLR). ESLR uses the state information of network devices as parameters to calculate a composite route metric; ESLR selects the network paths based on the cumulative propagation delay. By simulating ESLR using an ISP topology, the proposed protocol is examined for the effectiveness of using network device state information for network path selection.