DA-DA: a method to ease ipv6 rollout at non-slaac sites

The exhaustion of IPv4 addresses is handled in version 6 of the IP suite of protocols via a massive (x296) increase of the available address space. EUI-64 based automatic addressing (SLAAC) becomes possible, but it is not the only option for address allocation in this wide space - in certain cases it may not be an option at all. A mechanism (DA-DA: DNS-driven Allocation of DHCPv6 Addresses) is proposed to provide public addresses to dual-stack IPv4/v6 hosts via DHCPv6 and to populate the DHCPv6 configuration database in the course of the IPv4 ® IPv6 transition. Address assignment is driven by the DNS contents only and (similarly to SLAAC) provides hosts with access to the public IPv6 Internet with no user intervention. A reference implementation (in the form of an ISC DHCPv6 patch) is available

Configuration of User/Node affinity in a Sendmail+Dovecot+Squirrelmail e-mail cluster

The storage of user e-mail boxes on a shared filesystem and their read/write access on multiple cluster nodes requires special care to benefit from file persistence in the filesystem cache on each node and to prevent system response to be significantly degraded by frequent file synchronisations onto physical storage. The simplest measure towards this goal is to divide access to nodes on a per-user basis, while keeping the cluster failsafe. In this paper we share a few non-obvious details for the configuration of such user/node affinity in sendmail, dovecot, squirrelmail

BriXs ultra high fluxinverse compton source based on modified push-pull energy recovery linacs

We present a conceptual design for a compact X-ray Source BriXS (Bright and compact X-ray Source). BriXS, the first stage of the Marix project, is an Inverse Compton Source (ICS) of X-ray based on superconducting cavities technology for the electron beam with energy recirculation and on a laser system in Fabry-Pérot cavity at a repetition rate of 100 MHz, producing 20–180 keV monochromatic X-Rays devoted mainly to medical applications. An energy recovery scheme based on a modified folded push-pull CW-SC twin Energy Recovery Linac (ERL) ensemble allows us to sustain an MW-class beam power with almost one hundred kW active power dissipation/consumption

Utilizzo di BSD sendmail come relay centralizzato

Published by SIS-Pubblicazioni - Laboratori Nazionali di FrascatiConsiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7 Rome / CNR - Consiglio Nazionale delle RichercheSIGLEITItal

BriXs Ultra High Flux Inverse Compton Source Based on Modified Push-Pull Energy Recovery Linacs

We present a conceptual design for a compact X-ray Source BriXS (Bright and compact X-ray Source). BriXS, the first stage of the Marix project, is an Inverse Compton Source (ICS) of X-ray based on superconducting cavities technology for the electron beam with energy recirculation and on a laser system in Fabry-Pérot cavity at a repetition rate of 100 MHz, producing 20–180 keV monochromatic X-Rays devoted mainly to medical applications. An energy recovery scheme based on a modified folded push-pull CW-SC twin Energy Recovery Linac (ERL) ensemble allows us to sustain an MW-class beam power with almost one hundred kW active power dissipation/consumption

The MariX source (Multidisciplinary Advanced Research Infrastructure with X-rays)

MariX (Multidisciplinary advanced research infra-structure with X-rays) is a joint project of INFN and University of Milan, aiming at developing a twin X-ray Source of advanced characteristics for the future Sci-entific Campus of the University of Milan. Presently in its design study phase, it will be built in the post Expo area located in north-west Milan district. The first component of the X-source MariX is BriXS (Bright and compact X-ray Source), a Compton X-ray source based on superconducting cavities technology for the electron beam with energy recirculation and on a laser system in Fabry-Pérot cavity at a repetition rate of 100 MHz, producing 20-180 keV radiation for medical applications. The BriXS accelerator is also serving as injector of a 3.8 GeV superconductive linac, driving a X-ray FEL at 1 MHz, for providing coherent, moderate flux radiation at 0.3-10 KeV at 1 MHz. Scientific case, layout and typical parameters of MariX will be discussed