The AX.25 Link Access Protocol for Amateur Packet Radio is a data link layer protocol derived from the ITU-T X.25 data link protocol with modifications for use by amateur radio operators. One of the authors has produced a prototype AX.25 connected mode DTN Convergence Layer (CL) based on the existing DTN2 reference implementation. Initial testing of this implementation was undertaken on Linux in order to compare the performance of the implementation with the performance of native AX.25 links. Initial results appear to indicate that the current prototype can be up to 25 percent more efficient than using the Linux TCP/IP over AX.25 implementation in certain circumstances. The experimental results also reveal situations where obvious improvements can still be made to the implementation.
Abstract-The future of network communications is moving towards deployment of an all-IP core network. This has given rise to many devices hitting the market equipped with multiple network interfaces. However, in order to really benefit from such a heterogeneous network environment, applications must experience minimum disruption as they roam from one network to another, which requires seamless mobility support. Although, some mobility proposals have emerged (Mobile IPv6, and its extensions), none of them give satisfactory performance in terms of handover between different networks. In addition, they require infrastructural changes to the network and give poor performance in case of a failure. In this paper, we propose a mechanism to support mobility through a multi homing SHIM6 layer. The results show that our proposed mechanism outperforms Route Optimized Mobile IPv6.
a b s t r a c tIn the changing landscape of the todays Internet, several solutions are under investigation to allow efficient, flexible and scalable multihoming. One of the proposals is shim6, a host-based multihoming solution based on the use of multiple IPv6 addresses on each host. In this work, we first describe the main features of this protocol, then we explain our implementation of shim6, along with the associated security mechanisms in the Linux kernel and, finally, we evaluate its performance. In particular, we analyse the performance impact of the security mechanisms used by shim6 and the impact of shim6 on the performance of end-host systems, especially heavily loaded servers. We conclude by discussing the remaining open issues for a widespread deployment of host-based multihoming techniques such as shim6.
Abstract. Several solutions are proposed to enable scalable multihoming over IPv6. One of these proposals is Shim6, a host-based multihoming solution based on the modification of the Internet Protocol stack of the host. This modification adds a layer below the transport protocols but above the forwarding layer. As this approach makes the modifications to the network stack transparent, existing applications automatically benefit from Shim6 functionality. In this paper we investigated aspects of the performance of the LinShim6 implementation from Université Catholique de Louvain. We also outline our modifications of the LinShim6 implementation to allow external software to control the locators used between hosts.
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