chore(snippets): dump notes about networking commands

snippets/arp.fish

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+#!/usr/bin/fish
+
+###
+# Linux
+# ------------------
+###
+
+# Display the current entries
+arp
+arp --numeric
+
+# Answer requests for 10.0.0.2 on eth0 with the MAC address for eth1
+arp --device 'eth0' --use-device -s '10.0.0.2' 'eth1' 'pub'
+arp -i eth0 -Ds 10.0.0.2 eth1 pub
+
+# Delete the ARP table entry for 10.0.0.1 on interface eth1
+# Will match published proxy ARP entries *and* permanent entries
+arp -i 'eth1' -d '10.0.0.1'
+
+
+###
+# Mac OS X
+# ------------------
+###
+
+# Display the current entries
+arp -a
+
+# Delete entries
+arp -d -a
+arp -d -i 'en0' 'nas.lan'

snippets/route.fish

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+#!/usr/bin/fish
+
+###
+# Linux
+# ------------------
+###
+
+# Display the contents of the current routing table
+route
+route -n
+
+# Add routes
+route add -net '192.56.76.0' netmask '255.255.255.0' metric '1024' dev 'eth0'
+route add -net '192.57.66.0' netmask '255.255.255.0' gw 'astro'
+route add -net '224.0.0.0' netmask '240.0.0.0' dev 'eth1'
+route -6  add '2001:0002::/48' metric '1' dev 'eth2'
+
+# Add default routes
+# Default routes will be used when no other route matches
+# The gateway *must* be be on a directly reachable route
+route add 'default' gw 'dijkstra'
+route add 'default' gw '192.168.100.1'
+
+# Delete routes
+# Since the Linux routing kernel uses classless addressing, one pretty much always has to specify the netmask as seen in
+# 'route -n'
+route del -net '192.56.76.0' netmask '255.255.255.0'
+
+# Delete the current default route
+# It is either labeled 'default' or has '0.0.0.0' in the destination field of the current routing table
+route del 'default'
+
+
+###
+# Mac OS X
+# ------------------
+###
+
+# Flush the routing tables of all or specified gateway entries
+route flush
+route -n flush -inet6