[LARTC] A complicated routing scenario (for me at least)

[Andrew andrewd@uccsda.org]

<PRE>Hey, I'm working on the rules and routes to implement what I've been talking
about, and I've got a small question about the ip rule add.

I'm trying to add a blackhole route, and ip rule add seems to insist that I
provide a lookup table with the route.

For instance If I execute the command:

&quot;ip rule add from 0.0.0.0/0 type blackhole.&quot;

when I look at what it did with &quot;ip rule ls&quot; I see

&quot;from all lookup main blackhole&quot;

The only way it seems to get rid of main in the example above is
to define a dummy table and re-add the route like so:

&quot;ip rule add from 0.0.0.0/0 lookup bit-bucket type blackhole.&quot;

Then when I see what's done with &quot;ip rule ls&quot; it says:

&quot;from all lookup bit-bucket blackhole&quot;

I suppose that's OK. Just seems a bit stilted. Does it matter that the
bit-bucket table might not contain any routes? In the case of a blackhole route,
does the kernel even perform the table lookup? Would leaving the default main in
have been OK?

-Andrew


</PRE>