http[Illustration] How does HTTP/3 (HTTP over QUIC) work?〜Advantages of UDP, differences between versions(v1.0/v1.1/v2/v3)〜
The HTTP protocol has contributed to the...
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Windows Basic KnowledgeNTFS /MFT structure – How to set Extended Attributes,Alternate Data Stream –
NTFS File System NTFS is the standard fi...
DNS【Linux】BIND IXFR configuration – read this if it is not effect –
AXFR and IXFR AXFR and IXFR is both the ...
SELinuxSELinux basic config, list Contexts and Rules, add and delete parameters.
SELinux's basic config file SELinux's ba...
SELinux[Illustration] Introduction to SELinux – How it works? Explanation of the Basic knowledge –
What is SELinux? SELinux , Secure Enhanc...
LDAP[slapcat/slapadd] Usage,Options ~ OpenLDAP Backup/Restore and Migration, cn=config, cn=monitor, Error ~
slapcat basics and options In slapcat, y...
HP switch (H3C, 3COM)Initial setting & basic command of HPE(H3C) switch ~ VLAN configuration, ssh, snmp, ntp, syslog ~
I summarized the basic settings of HP 51...
All About robocopy “Error 5 : Access denied” is shown even with “roboocpy /B”
Windows denies access from who does not ...
TroubleshootAbout xfsaild related errors
What is xfsaild? xfsaild stands for XFS ...
HP switch (H3C, 3COM)Overview of HP stack stack technology IRF (Intelligent Resilient Framework) and setting
What is the HP Switch IRF? The technique...
NW SecurityMechanism of outgoing e-mail address impersonation [Mailsploit] ~ Basic e-mail anti-spoof technology SMTP AUTH, DKIM, SPF / SenderID overview (merit · demerit) Commentary and relation with this attack-
What is Mailsploit? Mailsploit is an att...
Can be used in fieldPing results – Difference between “Request timed out” and “Destination Host Unreachable”, General Failure –
In case Ping is success. When Ping is su...
NW SecurityIllustrate: WPA2’s vulnerability [KRACK] and Sequence of 4 way handshake
Logic that can be decrypted with KRACK I...
NW SecurityMan in the Middle attack (Channel-based MitM) in Wireless LAN
Man in the Middle attack of Wi-Fi The vu...
Can be used in field[TCP ZeroWindow], [TCP Window Update], [TCP Window Full] displayed on Wireshark – cause & countermeasure
I summarized the display related to "TCP...
HP switch (H3C, 3COM)HP switch config initialization
HP switch config initialization Execute ...
HP switch (H3C, 3COM)HP switch firmware update method (HP 5130 example)
Download firmware from HP website The HP...
Windows Basic KnowledgeWhat you can do with built-in group “BackupOperators privilege”, differences from administrators authority
What is the Built-in Group? A Built-in G...
NW SecurityIllustrate: Differences between [Specter] & [Meltdown] (Memory Protection & KPTI mechanism)
Introduction In this article "process" a...
NW SecurityIllustrate : CPU vulnerabilities [Spectre], [Meltdown] and Speculative Execution (Branch Prediction, Out of Order Execution)
Overview and scope of influence of Spect...
Grasp the network flow[Schematic] How does a Proxy server work? – http GET / https CONNECT method), DNS name order, Role, Advantage –
A proxy server a proxy response server t...
LDAPLDAP Beginners Tutorial – Examples of mechanisms , differences from AD and database –
What is LDAP? What can we do with LDAP? ...
Server Software[Illustrate]How transparent proxy works with http and https
What is a transparent proxy? Transparent...
HP switch (H3C, 3COM)The way of importing Digital Certificate to the HP switch HP5130
For the implementation of the Web authen...
Can be used in fieldWeb Login Load Test Tool “Curl-Loader”
J-Meter, etc. is famous as the Web of th...
IPAbout tracert (traceroute)
tracert (traceroute) is a tool to verify...
Server ArchitectureWhat is Virtual Memory? ~ About swap, MMU, paging table ~
What is Virtual Memory? The word virtual...
TroubleshootAbout Call Trace
The Call Trace, is a stack trace of the ...
Can be used in field“Bad TCP” Error in Wireshark
We summarize the meanings and causes of ...
TroubleshootMulticast stops halfway, switches to unicasts
Cause Host sending multicast and host re...