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David Malone is a mathematician-cum-sysadmin. He is a researcher in the Hamilton Institute in Maynooth, Ireland, working on mathematical models of communications networks. Since 1994, he's also been a member of the sysadmin team of the School of Mathematics located in Trinity College Dublin, Ireland. There he helps to maintain a Unix-like service provided by FreeBSD and Linux machines. Naturally, they all speak IPv6.