static default vs bgp default

[Hans van Kranenburg]

On 02/05/2016 01:09 PM, Anand Buddhdev wrote:
> Some Google searches later, I've discovered that Linux doesn't allow
> blackhole for IPv6 for some reason. I guess I will use "unreachable"
> instead of "blackhole" then.

That's probably a limitation of your linux kernel version.

 From the BIRD FAQ:

https://gitlab.labs.nic.cz/labs/bird/wikis/FAQ#ipv6-blackhole-and-prohibit-routes-do-not-work-on-linux

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IPv6 blackhole and prohibit routes do not work on Linux

This is a limitation of older versions of the Linux kernel, which do not 
support that route targets for IPv6 routes. A commonly used alternative 
is to use unreachable route target. If you want to blackhole traffic 
without sending out ICMP errors on linux, you can use route to a dummy 
device. Just insert kernel module dummy, this will add a dummy0 
interface to your system, so you can enable it and route traffic into 
it. In BIRD configuration this can be done using e.g. static route 
2001:db8:1337::/48 via "dummy0".
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-- 
Hans van Kranenburg - System / Network Engineer
T +31 (0)10 2760434 | hans.van.kranenburg at mendix.com | www.mendix.com