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networking [2014/03/30 16:31] – created skipidarnetworking [2020/12/27 20:35] (current) – external edit 127.0.0.1
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 +===== Networking =====
 +
 +== DMZ ==
 +Demilitarized Zone. The Network-Area, which contains Computers accessable from outside. \\
 +The Computers in DMZ can NOT access Computers in local net.
 +The Computers in local net CAN access Computers in DMZ, so that they are forwarded to the internet.
 +
 +== SSH ==
 +SSH is an application, which encrypts network traffic (packages) and redirects them to the receiver SSH applicaiton. \\
 +The receiver SSH decrypts the packages and redirects them to the initial Ports. \\
 +So any port may be bypassed thrpugh an ssh tunnel
 +
 +
 +
 +==== Tools ====
 +
 +== ping ==
 +Checks whether the network can be reached.
 +Resolves the ip by domain.
 +
 +== nslookup ==
 +Checks the domain by ip. Can use a concrete DNS server (e.g. the domain DNS server to resolve the domain controller ip in AWS)
 +
 +<code>
 +nslookup google.com
 +Server:         21.1.0.2
 +Address:        21.1.0.2#53
 +
 +Non-authoritative answer:
 +Name:   google.com
 +Address: 216.58.211.174
 +
 +
 +
 +
 +nslookup basic.local 21.1.2.35
 +Server:         21.1.2.35
 +Address:        21.1.2.35#53
 +
 +Name:   basic.local
 +Address: 21.1.3.174
 +Name:   basic.local
 +Address: 21.1.2.35
 +
 +</code>
 +
 +
 +== traceroute ==
 +traceroute - print the route packets take to network host  
 +
 +https://www.lifewire.com/traceroute-linux-command-4092586
 +
 +<code>
 +traceroute google.com
 +traceroute to google.com (216.58.211.174), 30 hops max, 60 byte packets
 + 1  ec2-79-125-0-176.eu-west-1.compute.amazonaws.com (79.125.0.176)  12.416 ms e                                                                   c2-79-125-0-178.eu-west-1.compute.amazonaws.com (79.125.0.178)  18.128 ms ec2-79                                                                   -125-0-182.eu-west-1.compute.amazonaws.com (79.125.0.182)  21.017 ms
 + 2  100.66.8.118 (100.66.8.118)  13.014 ms 100.66.8.106 (100.66.8.106)  16.647 m                                                                   s 100.66.8.112 (100.66.8.112)  19.972 ms
 + 3  100.66.10.204 (100.66.10.204)  19.664 ms 100.66.10.6 (100.66.10.6)  14.013 m                                                                   s 100.66.11.106 (100.66.11.106)  16.720 ms
 + 4  100.66.6.3 (100.66.6.3)  22.333 ms 100.66.7.139 (100.66.7.139)  14.137 ms 10                                                                   0.66.7.169 (100.66.7.169)  20.096 ms
 + 5  100.66.4.125 (100.66.4.125)  16.902 ms 100.66.4.99 (100.66.4.99)  16.893 ms                                                                    100.66.4.201 (100.66.4.201)  20.315 ms
 + 6  100.65.11.161 (100.65.11.161)  0.708 ms 100.65.9.1 (100.65.9.1)  3.319 ms 10                                                                   0.65.10.33 (100.65.10.33)  1.580 ms
 + 7  176.32.106.204 (176.32.106.204)  1.021 ms  1.016 ms  1.009 ms
 + 8  * * *
 + 9  52.93.7.156 (52.93.7.156)  13.002 ms * *
 +10  52.93.7.37 (52.93.7.37)  1.274 ms 52.93.7.150 (52.93.7.150)  2.957 ms 52.93.7.144 (52.93.7.144)  45.110 ms
 +11  72.14.204.244 (72.14.204.244)  1.107 ms  1.083 ms 52.93.7.45 (52.93.7.45)  1.216 ms
 +12  209.85.252.196 (209.85.252.196)  1.254 ms 72.14.204.244 (72.14.204.244)  1.193 ms 209.85.252.196 (209.85.252.196)  1.264 ms
 +13  209.85.241.139 (209.85.241.139)  1.307 ms 209.85.252.196 (209.85.252.196)  1.039 ms 209.85.241.139 (209.85.241.139)  1.046 ms
 +14  209.85.241.139 (209.85.241.139)  1.014 ms dub08s01-in-f14.1e100.net (216.58.211.174)  0.942 ms 209.85.241.139 (209.85.241.139)  1.014 ms
 +
 +</code>