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| Знайдено в інших БД: | Книжкові видання та компакт-диски (1) | Журнали та продовжувані видання (1) | Реферативна база даних (6) |
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Загальна кількість знайдених документів : 4 Представлено документи з 1 до 4 |
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| 1. | 
Davies J. N. An investigation into the effect of rule complexity in access control list [Електронний ресурс] / J. N. Davies, P. Comerford, V. Grout, N. Rvachova, O. Korkh // Радіоелектронні і комп’ютерні системи. - 2012. - № 5. - С. 33–38. - Режим доступу: http://nbuv.gov.ua/UJRN/recs_2012_5_7 An Access Control List is an ordered list of rules which specify the action to take for any packet which is tested and matched against it. The list is arranged in order of decreasing priority, therefore if a match is made on a particular rule the packet is either permitted or denied and no further rules are evaluated. When configuring firewall rules it is possible to specify varying levels of granularity when examining the fields of a packet header. The most basic form of checking is on the source Layer 3 address. However there are more complex forms of the rule which enables further fields to be checked. This paper investigates the effect on the performance of a router when using these complex rules. In particular it concentrates on the checking of the port number field in TCP/UDP. A specialized simulator was built to help understand the process undertaken by the router. There are results of the investigations and a recommendation on how to improve performance in certain areas. | ||
| 2. |
Davies J. N. Optimization principles for eliminating access control lists within a domain [Електронний ресурс] / J. N. Davies, P. Comerford, V. Grout, N. Rvachova, O. Korkh // Радіоелектронні і комп’ютерні системи. - 2012. - № 6. - С. 208–213. - Режим доступу: http://nbuv.gov.ua/UJRN/recs_2012_6_39 The infrastructure of large networks is broken down into areas that have a common security policy called a domain. Security within a domain is commonly implemented at all nodes however this can have a negative effect on performance since it introduces a delay associated with packet filtering. When Access Control Lists (ACLs) are used within a router for this purpose then a significant overhead is introduced associated with this process. It is likely that identical checks are made at multiple points within a domain prior to a packet reaching its destination therefore by eliminating ACLs within a domain by modifying the ingress/egress points with equivalent functionality an improvement in the overall performance can be obtained. | ||
| 3. |
Davies J. N. A comparison of the performance of IPv4 & IPv6 infrastructure networks [Електронний ресурс] / J. N. Davies, M. Tevkun, V. Grout, N. Rvachova // Радіоелектронні і комп’ютерні системи. - 2013. - № 5. - С. 39–44. - Режим доступу: http://nbuv.gov.ua/UJRN/recs_2013_5_7 The great increase in the number of devices connected to the Internet was not predicted at the time of creation the IPv4 protocol. Due to the fast growth of the Internet, the problem of the IPv4 addresses space exhaustion has appeared. Different technologies and solutions, such as NAT and CIDR, were proposed to solve alleviated the problem for some time but now the problem has become acute. IPv6, a modified version of the IP protocol, was introduction to solve this problem but the uptake of this has been very slow. One of the major stumbling blocks of the introduction is that the conversion has to been carried as a phased implementation requiring both IPv4 and IPv6 to be supported in the network infrastructure concurrently. Tunneling technologies, which allow IPv4 and IPV6 networks to operate simultaneously, have been developed. Unfortunately the use of these tunnels has an adverse effect on the network performance. This research was conducted to discover what performance issues are associated with converting an IPv4 network to an IPv6 network. To eliminate the uncertainties related to the Internet performance a set of experiments was conducted in the laboratory network to compare the delays experienced by packets traversing IPv4 network, IPv4 network with NAT, IPv6 network and mixed networks with utilizing tunnels. Very significant variations in the delays were found when using anything other than an IPv4 network. | ||
| 4. | 
Davies J. N. Comparison of network simulators in IP network [Електронний ресурс] / J. N. Davies, P. Comerford, V. Grout, M. V. Verovko, S. S. Stasiuk // Математичні машини і системи. - 2014. - № 4. - С. 3-11. - Режим доступу: http://nbuv.gov.ua/UJRN/MMS_2014_4_3 | ||
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