-ooption was given, then line feeds separating lines inside records are replaced with the backslash sign.
The output has the same syntax as arguments given to ip route add, so that it can be understood easily. F.e.
kuznet@amber:~ $ ip ro ls 193.233.7/24 126.96.36.199/24 dev eth0 proto gated/conn scope link \ src 188.8.131.52 realms inr.ac kuznet@amber:~ $
If you list cloned entries, the output contains other attributes which are evaluated during route calculation and updated during route lifetime. An example of the output is:
kuznet@amber:~ $ ip ro ls 184.108.40.206 tab cache 220.127.116.11 from 18.104.22.168 dev eth0 src 22.214.171.124 \ realms inr.ac/inr.ac cache <src-direct,redirect> mtu 1500 rtt 300 iif eth0 126.96.36.199 dev eth0 src 188.8.131.52 realms inr.ac cache mtu 1500 rtt 300 kuznet@amber:~ $1cm NB. The route looks a bit strange, doesn't it? Did you notice that it is a path from 184.108.40.206 back to 193.233.82? Well, you will see in the section on
ip route get(p.) how it appeared.
The second line, starting with the word
additional attributes which normal routes do not possess.
Cached flags are summarized in angle brackets:
local-- packets are delivered locally. It stands for loopback unicast routes, for broadcast routes and for multicast routes, if this host is a member of the corresponding group.
reject-- the path is bad. Any attempt to use it results in an error. See attribute
mc-- the destination is multicast.
brd-- the destination is broadcast.
src-direct-- the source is on a directly connected interface.
redirected-- the route was created by an ICMP Redirect.
redirect-- packets going via this route will trigger an ICMP redirect.
fastroute-- the route is eligible to be used for fastroute.
equalize-- make packet by packet randomization along this path.
dst-nat-- the destination address requires translation.
src-nat-- the source address requires translation.
masq-- the source address requires masquerading. This feature disappeared in linux-2.4.
notify-- (not implemented) change/deletion of this route will trigger RTNETLINK notification.
Then some optional attributes follow:
rejectroutes it is error code returned to local senders when they try to use this route. These error codes are translated into ICMP error codes, sent to remote senders, according to the rules described above in the subsection devoted to route types (p.).
expires-- this entry will expire after this timeout.
iif-- the packets for this path are expected to arrive on this interface.