What is a Linux guy doing at Sun?

As part of Sun Microsystems’ first CommunityOne, Ian Murdock, Sun’s chief operating system platform strategist and a self-described “Linux guy”, hosted a noteworthy session that explored a curious question: How can we make Solaris a better Linux than Linux? Murdock has a storied history in relation to Linux. A Linux user, developer, and advocate since 1993, he founded Debian in 1993, with the goal of creating a complete operating system […]

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Combined traceroute and ping utility (mtr)

MTR is a tool that combines the Unix/Linux traceroute and ping programs functionality in a single network diagnostic tool.   As mtr starts, it investigates the network connection between the host mtr runs on and certain HOSTNAME by sending packets with purposly low TTLs. It continues to send packets with low TTL, noting the response time of the intervening routers. This allows mtr to print the response percentage and response […]

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BSD Packet Filter (pf) resources

Here is list of some useful resources regarding OpenBSD Packet Filter: PF User’s Guide by by Wouter Coene NAT with pf by Jacek Artymiak Securing Small Networks with OpenBSD by Jacek Artymiak Firewalling with PF by Peter N. M. Hansteen (norwegian version, pdf, and slides available, too) A Newbie’s Guide to Setting up PF on OpenBSD by Eric Bullen A Beginner’s Guide To Firewalling with pf Guide to OpenBSD Packet […]

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Simple way to transmit files over network (nc utility)

There are many ways to transmit files between computers over the heterogeneous network (Linux, Windows, Apple MAC and other systems). I used to run SCP for my every day administrative tasks, especially when client SCP utility is available for Windows too. But here is useful tip on how to transmit files over network with no need to install and configure any service at server: just run at Linux or Unix […]

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Manage FreeBSD kernel modules on the fly

There are several utilities in FreeBSD to manage kernel modules. Among them are: kldload, kldstat, kldunload. First (kldload) would be useful for loading files *.ko into FreeBSD kernel using kernel linker. Second (kldstat) displays status of files loaded into kernel. Third (kldunload) helps to unload files which were previously loaded into kernel with kldload. This utilities are analogues of modprobe and lsmod utilities in Linux. Example: in order to enable […]

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