sinkyh@xxxxxxxxxxxxx wrote:
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.
Hello,
without being a network/routing guru, imho if there's not route to host
X, you should see a message like 'no route to host'...
Did you flush the cache?
`ip route flush cache` - should clear it, so old records are removed.
btw: bit offtopic here.... (not netfilter, tc, related)
Hope it helps.
regards
Mart
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