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23%
Managing Linux systems with Spacewalk
30.11.2025
Home »  Archive  »  2010  »  Issue 1: System...  » 
© patrimonio designs, Fotolia.com
of Oracle Express supports a maximum of 40 simultaneous connections, which is not enough for Spacewalk operations. The instructions in Listing 3 change the limit to a maximum of 400 connections. Listing
23%
QoS Systems for Disaster Recovery Support
06.08.2026
Home »  Archive  »  2026  »  Issue 94 OpenSt...  » 
Lead Image © crazymedia, 123RF.com
,AP_9,,100.64.0.3,fdd7:b724:0:300::/56,1.25,0.75,10.5,5.25, 4,"8493 Campfire Street, Peabody, MA 01960",4,Device 4,AP_9,,100.64.0.4,fdd7:b724:0:400::/56,25.5,12.5,100.5,50.25, 2794,"6 Littleton Drive
23%
Mandatory access control with Tomoyo Linux
30.11.2025
Home »  Archive  »  2012  »  Issue 09: Windo...  » 
© 3drenderings, 123RF.com
compared with version 1.x are noticeable in Tomoyo versions 2.2.x and 2.3.x; the current version 2.5 only lacks a couple of features. Unfortunately, version 2.5 is only available in Linux kernel 3.2, which
23%
ARP cache poisoning and packet sniffing
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
© elisanth, 123RF.com
traffic normally unavailable because of layer 2 switching. Arpspoof [3] is much simpler than ettercap for redirecting packets: # arpspoof -i eth0 -t host Specifying the interface is optional
23%
A Btrfs field test and workshop
31.10.2025
Home »  Archive  »  2012  »  Issue 11: Cloud...  » 
© Adrian Hillman, 123RF.com
. Enterprise-Level Features Btrfs is a copy-on-write (COW) filesystem. Whereas a filesystem like ext3 logs block changes in a journal, Btrfs always writes changes to a block at a new location on the disk
23%
Strategies for routing voice calls around a firewall
30.11.2025
Home »  Archive  »  2010  »  Issue 0: Active...  » 
gnohz, 123RF.com
and then rewrites the Contact header to contain the publicly reachable NAT gateway socket. Listing 3 shows an Invite request that has been modified by the SIP proxy: 18.17.16.15 is the gateway's public address; 20.22
23%
Virtualization via Zones
30.11.2025
Home »  Archive  »  2010  »  Issue 0: Active...  » 
Pei Ling Hoo, 123RF.com
directories, sets up links, and copies files into the zone to create the new system's layout (Listings 2 and 3). The installation also creates the zone's chrooted directory /zones/web1 and sets the appropriate
23%
New Approaches to DNS
02.06.2026
Home »  Archive  »  2026  »  Issue 93 Disast...  » 
Lead Image ©bowie15, 123RF.com
some recent protocols that have evolved around the need to address the security issues associated with DNS. You'll learn about: DNS over HTTPS DNS over TLS DNS over QUIC DNS over HTTP/3
23%
Beyond monitoring: Mathematical load simulation in Perl
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
© kudryashka, 123RF.com
Model"; 11 $work = "ebiz-tx"; 12 $node1 = "WebServer"; 13 $node2 = "AppServer"; 14 $node3 = "DBMServer"; 15 $think = 0.0 * 1e-3; # as per test system 16 $dtime = 2.2 * 1e-3; # dummy service time 17 18
23%
The Swiss Army knife of fault management
30.11.2025
Home »  Archive  »  2011  »  Issue 5: Pen Te...  » 
© Dmitry Rukhlenko, 123RF.com
, POP3, or DNS immediately after installation. The system is extensible thanks to configurable monitors, so administrators can quickly cook up a large collection of monitoring options that don't require

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