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In recent years, there have been a large number of educational PCs in many universities with the development of computer-assisted teaching. As the number of educational PCs has increased, the burden on the administrators has also increased. In general, these educational PCs have been configured from one or a few model disk images to reduce this burden. This method, however, lacks flexibility of administration...
With the wide spread of the Internet and the increasing of the Internet users, the fact of concentrated accesses to a specific server becomes a critical problem and it is important to process those accesses effectively. Multihomed network is attracted much attention to provide stable and efficient Internet services. In this paper, we focus on the multihoming method in the IPv6 environment. In the...
In the research institutes such as universities or companies, they contract electronic journals for document retrieval and document collection. When an organization contracts electronic journals, the site license is preferred. Because of terms of a site license include location or affiliation of users, available electronic journals differ from users. On the other hand, the user and the terminal are...
In recent years, spam mails intending for ``One-click fraud" or ``Phishing" have become increasing. As one anti-spam technology, DNSBL based on the URLs or their corresponding IP addresses in the messages is well used. However, some spam mails that cannot be filtered by conventional DNSBLs get appearing since the spammers create websites using various techniques such as botnet, fast-flux...
With the popularity of the Internet services, network security becomes critical issue in the Internet world. Especially, the threats of malicious accesses make the firewall systems have to low down performance due to strict inspections. In this paper, we propose an adaptive firewall system in collaboration with DNS (Domain Name System) which introduces querier's IP address notification feature. With...
NAT (Network Address Translation) is widely used as a technique that shares a single IP address in several PCs, and is widely used for alleviating the IPv4 address exhaustion and as a security solution. However, when a backbone network has access control function for PCs based on their IP addresses, it can not identify the PCs behind a NAT router since their original IP addresses are hidden by the...
NAT (Network Address Translation) is well-known as one of the short-term solutions of IPv4 address exhaustion. NAT is a technique that shares a single IP address in several PCs, and is widely used for alleviating the IPv4 address exhaustion and as a security solution. However, when a backbone network has access control function for PCs based on their IP addresses, it cannot identify the PCs under...
Recently one of sender authentication methods called SPF is getting popularized as an anti-spam technology. However, SPF has a problem in terms of that the forwarded e-mails can not be authenticated correctly. In this paper, we propose a solution for SPF on forwarded e-mails by tracing recipient addresses in "Received" fields of e-mail header without customization on forwarding MTA. The...
With the explosive widespread of the Internet, many fundamental and popular Internet services such as WWW and e-mail are becoming more and more important and are indispensable for the human's social activities. As one technique to operate the systems reliably and efficiently, the way of introducing multihomed networks attracts much attention. However, conventional route selection mechanisms on multihomed...
To operate e-mail systems stably multihomed networks are well used. As an operation method on multihomed networks, we have proposed a dynamic route selection method considering status of networks. However, status of Mail Transfer Agents(MTAs) have not been considered in this method so that a heavily loaded MTA would be possibly selected. In this paper, we propose a new dynamic route selection method...
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