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100%
Intruder detection with tcpdump
30.11.2025
Home
»
Archive
»
2012
»
Issue 07: Xen v...
»
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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»
Archive
»
2021
»
Issue 61: Secur...
»
5221548db 58 seconds ago 5.67MB
80dc7d447
a
48 About a minute ago 167MB alpine 3.
9
78
a
2
ce922f86 5 months ago 5.55MB The command you really
93%
Security without firewalls
31.10.2025
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»
Archive
»
2012
»
Issue 12: NAS S...
»
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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Articles
»
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 mail
2
, 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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HPC
»
Articles
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scan results [bsr] 0x18 Protocol specific port [psp] 0x1
a
Power condition transitions [pct] 0x
2
f Informational exceptions [ie] 0x37 Cache (seagate) [c_se] 0x38 0x3e
92%
When I/O workloads don't perform
02.08.2021
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»
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»
2021
»
Issue 64: Bare...
»
.06 0.00 30.83 0.26 0.00
9
.78 0.67 0.60 nvme0
n
1 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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»
Archive
»
2016
»
Issue 32: Measu...
»
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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2019
»
Issue 53: Secur...
»
-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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»
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»
2012
»
Issue 10: Traff...
»
julia> limulus limulus limulus limulus
n
2
n
0
n
2
n
0 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
1
2
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