On 12.01.2016 16:34, Hannes Frederic Sowa wrote:

On 29.12.2015 11:54, Stas Sergeev wrote:

quoted

Hello.

I was hitting a strange problem when some internet hosts
suddenly stops responding until I reboot. ping to these
host gives "Destination Host Unreachable". After the
initial confusion, I've finally got to
ip route get
and got something quite strange.


Example for GOOD address (the one that I can ping):

ip route get 91.189.89.237
91.189.89.237 via 192.168.8.1 dev eth0  src 192.168.10.202
     cache


Example for BAD address (the one that stopped responding):

ip route get 91.189.89.238
91.189.89.238 via 192.168.0.1 dev eth0  src 192.168.10.202
     cache <redirected>

I tried to understand this thread and now wonder why this redirect route
isn't there always. Can you please summarize again why this shouldn't
happen? It looks totally fine to me from the configuration of your
router and the subnet masks.

Just an addendum:

In IPv6 a redirect is seen as a notification telling hosts, this new 
address is on the same link as you. I think this semantic is the same 
for IPv4, so we are informing you that in essence you are getting a /32 
route installed to your new interface and can do link layer resolving of 
the new host.

I do think this is valid and fine.

Bye,
Hannes