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100%
Intruder detection with tcpdump
30.11.2025
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© Monika Wisniewska, 123RF.com
expressions # tcpdump -n -I eth1 host 10.10.253.34 and host 10.10.33.10# tcpdump -n -I eht1 src net 10.10.253.0/24 and dst net 10.10.33.0/24 or 192.5.5.241# tcpdump -n -I eth1 src net 10
98%
Endlessh and tc tarpits slow down attackers
02.02.2021
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Lead Image © Yewkeo, 123RF.com
5221548db 58 seconds ago 5.67MB 80dc7d447a48 About a minute ago 167MB alpine 3.9 78a2ce922f86 5 months ago 5.55MB The command you really
93%
Security without firewalls
31.10.2025
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© rukanoga, 123RF.com
software, Postfix [2]. The story goes that the talented Venema needed to keep track of attacks on workstations at a university and wrote a piece of software capable of limiting port access by rules
92%
Secure Your Server with TCP Wrappers
02.10.2012
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addresses to connect /etc/hosts.allow , the file would simply look like this: sshd: 10.10.10.10, 1.2.3.4, 21.21.21.21 TCP Wrappers works nicely, even if you change the standard SSH port (it’s usually TCP
92%
TinyDNS
02.03.2012
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shows this for the MX entry: @domainname.com::mail.domainname.com:10:3600 If you ran a similar MX command again adding mail2 , you’d add a secondary MX with a different priority (a.k.a. delivery
92%
When I/O Workloads Don’t Perform
12.05.2021
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 scan results [bsr]     0x18        Protocol specific port [psp]     0x1a        Power condition transitions [pct]     0x2f        Informational exceptions [ie]     0x37        Cache (seagate) [c_se]     0x38     0x3e
91%
When I/O workloads don't perform
02.08.2021
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Lead Image © Viacheslav Iakobchuk, 123RF.com
.06 0.00 30.83 0.26 0.00 9.78 0.67 0.60 nvme0n1 2769.50 2682.00 29592.00 10723.25 241.00 0.00 8.01 0.00 0.11 0.02 0.01 10.68 4.00 0.14 77.60 sdb
91%
Fundamentals of I/O benchmarking
11.04.2016
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Lead Image © Kheng Ho Toh, 123RF.com
B blocks: 25.3 IO/s, 50.6 MiB/s (424.9 Mbit/s) As the block size continues to grow, the transfer rate becomes increasingly important; a track change is only possible after fully reading the current
91%
Manage OpenVPN keys with Easy-RSA
06.10.2019
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Lead Image © Orlando Rosu, 123rf.com
-server-full commands handle the request and sign procedure automatically, without requiring any intervention on the part of the admin. The scripts CharitÈ uses are based on Easy-RSA 2.2.2-2, which comes with the Debian
90%
Julia: A new language for technical computing
30.11.2025
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julia> limulus limulus limulus limulus n2 n0 n2 n0 To get a better feel for parallel computation, I can run the example from the Julia documentation [9]. First, see how it works on one node

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