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72%
Intruder detection with tcpdump
30.11.2025
Home »  Archive  »  2012  »  Issue 07: Xen v...  » 
© Monika Wisniewska, 123RF.com
. -n Do not resolve IP addresses to domain names or port numbers to service names. -nn Don't resolve hostnames or port names. -X Show packet's content in both hex
72%
Targeted defense against brute force attacks
30.11.2025
Home »  Archive  »  2011  »  Issue 3: Are yo...  » 
Andrii IURLOV, 123RF.com
, most likely, (3/2) x 15 seconds. Finally, -s defines the number of seconds to wait before sshguard "forgets" the attacker's IP address. The line sshguard -l /var/log/auth.log -s 20 instructs sshguard
72%
Generating information with the touch of a button
30.11.2025
Home »  Archive  »  2010  »  Issue 2: Backup...  » 
on their website is for version 2.0. Each package also contains a PDF version of the install guide, as well as the admin guide, which can also be downloaded separately from SourceForge. Neither has much detail
71%
A simple approach to the OCFS2 cluster filesystem
30.11.2025
Home »  Archive  »  2010  »  Issue 1: System...  » 
© Kheng Ho Toh, 123RF.com
_dlm] root 3467 7 0 20:07 ? 00:00:00 [o2net] root 3965 7 0 20:24 ? 00:00:00 [ocfs2_wq] root 7921 7 0 22:40 ? 00:00:00 [o2hb-BD5A574EC8] root 7935 7
71%
Dispatches from the world of IT
30.11.2025
Home »  Archive  »  2011  »  Issue 4: Secure...  » 
 
a supportable release available for Ubuntu 12.04. According to the blueprint, the plan is "to achieve a high quality level under functional and load conditions for the identified use cases. The Ubuntu team plans
71%
Virtualization with KVM
30.11.2025
Home »  Archive  »  2010  »  Issue 2: Backup...  » 
systems on your virtual machines, the Linux host system must provide a 64-bit kernel. To determine this, run the uname -m command, and it should output a value of x86_64 or amd64. You can run virtual
71%
Data acquisition with shell tools
30.11.2025
Home »  Archive  »  2010  »  Issue 2: Backup...  » 
Dmitriy Syechin, 123RF
"------------------------------------------------------" 18 echo -n "Replace stored data line (y)? ";read we 19 if [ "$we" = "y" ]; 20 then 21 22 # Delete line and write to 23 # temporary file 24 25 # Build sed instruction 26
71%
Troubleshooting SELinux
30.11.2025
Home »  Archive  »  2010  »  Issue 0: Active...  » 
Sapsiwai, Fotolia
SELinux Information with -Z 01 # id -Z 02 user_u:system_r:unconfined_t 03 # ls -dZ /var/www/html 04 drwxr-xr-x root root system_u:object_r:httpd_sys_content_t /var/www/html 05 # ps -efZ | grep httpd 06
71%
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
71%
The next generation of Internet connectivity
30.11.2025
Home »  Archive  »  2011  »  Issue 3: Are yo...  » 
ktsdesign, 123RF.com
:%02x%02x\n' 19 83 20 235 Note that 6to4 relays (the machines that handle your traffic) use the anycast address of 192.88.99.1 (2002:c058:6301::), so finding out who is actually handling your traffic

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