Hello all,
I have, I hope, a simple question. From my understanding, by default
ping looks up up the IP address in the Linux kernel routing tables.
What happens if the IP is not in the routing table? Is the ping packet
simply dropped?
The reason I ask this is that I have a few wireless devices for
testing purposes and I am using iptables to mimic a particular
topology. Mainly forcing the presence of only two possible routes from
a source to a destination over a series of hops. These devices have
their own routing protocol and basically routes are added/ deleted
from the Linux kernel routing tables based on metric measurements bla
bla bla. That is just fine and normal.
However, since the devices are all in range of each other (due to
space restriction), if lets say the destination node IP is temporarily
lost from the source's routing table, for some reason the source is
still able to ping the destination directly. I assumed that if an IP
is not in the source's routing table that the outgoing ping would be
dropped/ ignored until the IP reappears. Not continue on ignoring
routing tables....
Can anyone shed some light on this?
Thanks for your help and suggestions.
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