clean up duff entries

networking/network_protocols.md

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+---
+title: "protocols"
+tags: [ "Documentation", "Networking" ]
+---
+# Protocols
+
+| TCP | UDP | ICMP |
+|:-----------------|:-----------------|:------------------|
+|Transmission Control Protocol | User Datagram Protocol | Internet Control Message Protocol |
+| Reliable and slow.  | Fast but unreliable, such as VOIP.  Provides checksums. | Dirty checks such as pings. |
+
+
+
+
+# Networking Addressing
+
+## IPv4
+
+Three address ranges pertain only to private Networks, so no computer looks beyond the local router to resolve them:
+
+10.0.0.0	to	10.255.255.255
+
+172.16.0.0	to	172.31.255.255
+
+192.168.0.0	to	192.168.255.255
+
+In theory, Networks should fall within one of 3 ranges, depending upon their first octet:
+
+Class A	1-127
+
+Class B	128 to 191
+
+Class C	192 to 223
+
+
+
+# Service Ports
+
+There are three types of port ranges:
+
+1 to 1023:	Well-known and established ports.
+
+1024 to 49151	ICANN registered ports, used by various products, with limited oversight.
+
+49152 to 65535	Dynamic ports for ad hoc use.
+
+View a more complete list of ports with:
+
+> less /etc/services
+
+
+# ip
+
+Show all addresses with:
+
+> ip a{dd{ress}} s{how}
+
+If a link's not present, load it with:
+
+sudo ip link set dev wlp3s0 up
+
+Add an interface to a device as so:
+
+> sudo ip a add 192.168.0.15/255.255.255.0 dev eth1
+
+See Network interfaces available on Fedora with:
+
+> less /etc/sysconfig/Network-scripts/ifcfg-enp2s0f0
+
+or on Debian with:
+
+> less /etc/Network/interfaces
+
+Mostly, interfaces will receive automatic addresses from a DHCP server.  If this hasn't happened for you, you can request a dhcp address with:
+
+> sudo dhclient eth1
+
+View your current route to the internet with:
+
+> route
+
+... although on void this is:
+
+> routel
+
+If you don't have a route to the internet, you can manually specify the default gateway with:
+
+> sudo route add default gw 192.168.0.1
+
+... or ...
+
+> sudo ip route add default via 192.168.0.1
+
+