====== Network ======

===== Check IPs =====
  * [[https://aruljohn.com/|Arul's Utilities (IP tracking, MAC address)]]
  * [[https://www.whatismyip.com/|What is my IP]]
  * [[http://whatismyipaddress.com/|What is my IP address]]
  * [[http://whois.domaintools.com/|Whois Lookup]]
  * [[https://www.whatismybrowser.com/detect/what-is-my-user-agent|What is my User Agent]]
  * [[https://www.sslshopper.com/ssl-checker.html|SSL checker]]
  * [[http://amibehindaproxy.com/|Am I Behind A Proxy?]]
  * [[http://www.iplocation.net/|IP Location Finder]]
  * [[http://tools.tracemyip.org/search--org/true+internet|TRUE IP address ranges]]
  * [[https://support.microsoft.com/en-my/help/164015/understanding-tcp-ip-addressing-and-subnetting-basics|Understanding TCP/IP addressing and subnetting basics]]
  * [[https://macvendors.com/|Find MAC Address Vendors]]
  * [[https://dmarcian.com/|Check Email protection]]

===== DNS & Mail =====
  * [[net:tvbox|Watch TV which is restricted to domestic IP]]
  * [[https://easydmarc.com/tools|SPF, DKIM, DMARC]]
  * [[http://www.whatsmydnsserver.com/|What's My DNS Server?]]
  * [[https://dnssec-analyzer.verisignlabs.com/|Verify DNS]]
  * [[http://simpledns.com/lookup-dg.aspx|Trace DNS Delegation]]
  * [[https://www.grc.com/dns/dns.htm|DNS Nameserver Spoofability Test]]
  * [[https://www.whatsmydns.net/#CNAME/|DNS propagation checker]]
  * [[https://dnsleaktest.com/|Check nameservers used]]
  * [[http://www.digwebinterface.com/?hostnames=&type=Reverse&ns=resolver&useresolver=8.8.4.4&nameservers=|Dig web interface]]
  * [[https://www.youtube.com/watch?v=nlvJ6ZaaWLU|How to run your own DNS Resolving Server]]
  * [[https://now-dns.com/?p=home|Now-DNS: Free DynDNS service and clients]]
  * [[net:dns|DNS Servers]]

===== SSL & Ports =====
  * [[https://www.sslshopper.com/ssl-checker.html|SSL Checker]]
  * [[http://www.yougetsignal.com/tools/open-ports/|Port Forwarding Tester]]
  * [[http://canyouseeme.org/|Open Port Check Tool]]
  * [[https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/3/html/Security_Guide/s1-server-ports.html|Verifying Which Ports Are Listening]]

===== Email =====
  * [[:net:yahoo|Yahoo]]
  * [[:net:gmail|Google Mail]]
  * [[:net:mail|Mail Settings]]
  * [[:net:mailserver|Mail Server]]
  * [[https://support.google.com/a/answer/174126?hl=en|Enhance security for outgoing email (DKIM)]]
  * [[https://www.dmarcanalyzer.com/dkim/dkim-check/|DKIM Record Check]]
  * [[https://www.mailjet.com/blog/news/setting-up-dkim-step-by-step-a7d0a0ec-c4aa-4b5b-aeb5-a06361aa2e51/|How to Set Up DKIM in 3 Simple Steps]]

===== Speed =====
  * [[http://speedtest.3bb.co.th/|3BB Speed Test]]
  * [[https://www.jeffgeerling.com/blog/2023/testing-iperf-through-ssh-tunnel|Testing iperf through an SSH tunnel]]
  * [[https://tools.pingdom.com|Pingdom Website Speed Test]]
  * [[http://www.whatsmyua.com/|What is my browser's User Agent]]
  * [[https://msdn.microsoft.com/en-us/library/ms537503%28v=vs.85%29.aspx|Internet Explorer User Agents]]
  * [[https://gtmetrix.com|GTmetrix]]

===== Block Access =====
  * [[http://www.wizcrafts.net/chinese-blocklist.html#my-cat|Block China and Korea From Apache Based Servers or Forums with a .htaccess Blocklist]]
  * [[https://neverendingsecurity.wordpress.com/2015/04/13/iptables-blacklist-script/|iptables blacklist script]]
  * [[https://www.howtogeek.com/177621/the-beginners-guide-to-iptables-the-linux-firewall/|The Beginner’s Guide to iptables, the Linux Firewall]]
  * [[http://www.parkansky.com/china.htm|Stop Traffic From China IP Addresses To
Protect Your Web Server From Chinese Hackers]]
  * [[https://bobcares.com/blog/fix-mysql-high-cpu-usage/|How to fix MySQL high CPU usage]]
  * [[http://www.ipdeny.com/ipblocks/|IPdeny country block downloads]]
  * [[https://supportforums.cisco.com/t5/firewalling/block-all-russia-public-ip-addresses/td-p/2094303|Block all Russia Public IP Addresses]]
  * [[http://www.thegeekstuff.com/2009/03/4-ways-to-identify-who-is-logged-in-on-your-linux-system/|4 Ways to Identify Who is Logged-In on Your Linux System]]