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100%
ARP cache poisoning and packet sniffing
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
© elisanth, 123RF.com
Destination MAC address Listing 1 Nemesis arp Packets 01 $ while true 02 > do 03 > sudo nemesis arp -v -r -d eth0 -S 192.168.1.2 -D 192.168.1.133 -h 00:22:6E:71:04:BB -m 00:0C:29:B2
99%
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
98%
Monitoring daemons with shell tools
30.11.2025
Home »  Archive  »  2010  »  Issue 1: System...  » 
© Shariff Che'Lah, 123RF.com
is not accessible! ****************" >> dba.log 15 /usr/local/etc/rc.d/002pgsql.sh start 16 sleep 15 17 psql -U monitor -d monitor -c "select * from watch;" 18 19 if [ $? -eq 0 ]; 20 21 then 22
98%
Data acquisition with shell tools
30.11.2025
Home »  Archive  »  2010  »  Issue 2: Backup...  » 
Dmitriy Syechin, 123RF
# If the line already exists .... 13 if [ $back -eq 0 ]; 14 then 15 echo "############### Line already exists! #############" 16 grep $keyfield $newdat 17 echo
97%
Monitoring your cluster with a home-grown OCF agent
30.11.2025
Home »  Archive  »  2012  »  Issue 07: Xen v...  » 
© Aleksey Mnogosmyslov, 123RF.com
License (GPL) 13 # 14 # (c) 2011 hastexo Professional Services GmbH 15 # 16 # This resource agent is losely derived from the MySQL resource 17 # agent, which itself is made available to the public
97%
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
96%
Targeted defense against brute force attacks
30.11.2025
Home »  Archive  »  2011  »  Issue 3: Are yo...  » 
Andrii IURLOV, 123RF.com
, although it is the older version 1.4; you can get the improved 1.5 version from the sshguard website [2]. When this magazine went to press, the latest version was a release candidate, but the final version
96%
An IT nomad's diary
30.11.2025
Home »  Archive  »  2011  »  Issue 5: Pen Te...  » 
© Jasmin Merdan, 123RF.com
software repository on your computer. Listing 1 shows you the Yum repository file for Fedora 14/15, or RHEL 6; the OpenShift website has installation how-tos for other systems (including Windows and Mac OS X
96%
Single sign-on with SSSD, LDAP, and Kerberos
30.11.2025
Home »  Archive  »  2010  »  Issue 2: Backup...  » 
Anja Kaiser; Fotolia
: tscherf@TUXGEEK.DE 15 SASL SSF: 56 16 SASL data security layer installed. 17 dn: uid=TScherf,ou=People,dc=tuxgeek, dc=de 18 givenName: Thorsten 19 sn: Scherf 20 loginShell: /bin/bash 21 uidNumber: 9999 22
95%
Boost performance of your Python programs
30.11.2025
Home »  Archive  »  2010  »  Issue 2: Backup...  » 
Eric Isselée, 123RF
() 15 p1.start() 16 p3.start() 17 18 p1.join() 19 p2.join() 20 p3.join() To see that multiprocessing creates multiple subprocesses, run the code shown in Listing 2 (counting

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