Attacks on BGP Routing Ranges

Job Snijders job at
Wed Apr 18 10:44:47 UTC 2018


On Wed, 18 Apr 2018 at 11:39, Ryan Hamel <Ryan.Hamel at> wrote:

> I wanted to poll everyones thoughts on how to deal with attacks directly
> on BGP peering ranges (/30's, /127's).
> I know that sending an RTBH for our side of the upstream routing range
> does not resolve the issue, and it would actually make things worse by
> blackholing all inbound traffic on the carrier I send the null to. What are
> my options for carriers that are not willing to help investigate the
> situation or write up a firewall rule to mitigate it on the circuit? I am
> not a fan of naming and shaming because it has unintended consequences.
> Thanks in advance for everyone's suggestions.

Some carriers offer “unreachable linknets”, linknets that are carved from
netblocks that aren’t announced in the DFZ or are firewalled off.

If the carrier doesn’t want to help, your best course of action may be to
disconnect the circuit to stop the attack traffic.

Kind regards,


More information about the NANOG mailing list