Iproute2

general

for all commands (route|rule|...) the subcommand 'show' is the default!
so if you run command e.g.: 'ip route' its the same as 'ip route show'.

routing table

Show, add, delete and manipulate routes!

show routes

ip route

or

ip route show

or

ip route show table MyFuckingROUTES

be sure to add something like this to the file where the names (they identify by number normally)
for routing tables are defined/mapped to the numbers.
so edit the file: /etc/iproute2/rt_tables and add a line like:

200   MyFuckingROUTES

the numbers 253, 254, 255 and 0 are reserved!

since iproute can handle multiple routing tables
and you can decide which table has to be used on specific packet attributes
these rules can be shown/set using ip rules command.

get routing decision

ip route get returns the routing decision based on the parameters
if such a packet would reach the system through network.

# ip route get 10.20.30.40 from 192.168.5.6

10.20.30.40 from 192.168.5.6 via 172.16.10.1 dev eth0
   cache  mtu 1500 advmss 1460 hoplimit 64

Usage:

ip route get ADDRESS [ from ADDRESS iif STRING ]
                            [ oif STRING ]  [ tos TOS ]

Usage: ip route

Usage: ip route { list | flush } SELECTOR
       ip route get ADDRESS [ from ADDRESS iif STRING ]
                            [ oif STRING ]  [ tos TOS ]
       ip route { add | del | change | append | replace | monitor } ROUTE
SELECTOR := [ root PREFIX ] [ match PREFIX ] [ exact PREFIX ]
            [ table TABLE_ID ] [ proto RTPROTO ]
            [ type TYPE ] [ scope SCOPE ]
ROUTE := NODE_SPEC [ INFO_SPEC ]
NODE_SPEC := [ TYPE ] PREFIX [ tos TOS ]
             [ table TABLE_ID ] [ proto RTPROTO ]
             [ scope SCOPE ] [ metric METRIC ]
INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...
NH := [ via ADDRESS ] [ dev STRING ] [ weight NUMBER ] NHFLAGS
OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ]
           [ rtt TIME ] [ rttvar TIME ] [ window NUMBER]
           [ cwnd NUMBER ] [ hoplimit NUMBER ] [ initcwnd NUMBER ]
           [ ssthresh NUMBER ] [ realms REALM ] [ src ADDRESS ]
           [ rto_min TIME ]
TYPE := [ unicast | local | broadcast | multicast | throw |
          unreachable | prohibit | blackhole | nat ]
TABLE_ID := [ local | main | default | all | NUMBER ]
SCOPE := [ host | link | global | NUMBER ]
FLAGS := [ equalize ]
MP_ALGO := { rr | drr | random | wrandom }
NHFLAGS := [ onlink | pervasive ]
RTPROTO := [ kernel | boot | static | NUMBER ]
TIME := NUMBER[s|ms|us|ns|j]

routing rules

ip rule show

TODO: mach et!

Usage: ip rule

Usage: ip rule [ list | add | del | flush ] SELECTOR ACTION
SELECTOR := [ not ] [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK[/MASK] ]
            [ dev STRING ] [ pref NUMBER ]
ACTION := [ table TABLE_ID ]
          [ prohibit | reject | unreachable ]
          [ realms [SRCREALM/]DSTREALM ]
          [ goto NUMBER ]
TABLE_ID := [ local | main | default | NUMBER ]