Hello,
I'm Matthias and I'm new to this list. I just signed up, to ask the
following question.
I have a configuration like this:
root@des1 ~ # ip rule
0: from all lookup local
32765: from all iif lo lookup ffnet suppress_prefixlength 0
32766: from all lookup main
32767: from all lookup default
(ffnet is table 42)
root@des1 ~ # ip r s
default via 5.9.86.151 dev eth0
5.9.86.151 dev eth0 proto kernel scope link src 5.9.86.144
root@des1 ~ # ip r s t 42
blackhole default
I have the default routing table, and a routing table number 42. I could
use an ip rule filtering by destination ip, but I wanted to try
suppress_prefixlength.
Let's say I want to ping 8.8.8.8. What I expect is, that the package is
put into routing table 42 by the ip rule 32765. As there is no more
specific route for 8.8.8.8 than the default route in table 42, I expect
the suppress_prefixlength 0 option to put it back to the default routing
table and then to be send out through eth0.
Instead this configuration takes the whole machine offline:
root@des1 ~ # ping 8.8.8.8
connect: Invalid argument
When I delete the ip rule 32765 containing the suppress_prefixlength,
the machine is back online.
Do I not understand the suppress_prefixlength-feature correctly or is
this a bug? I tested with Kernel 4.7 and 4.6, both show the same
behaviour as described above.
Thanks for any replies in advance.
Regards,
Matthias
