[c-nsp] question on s/rtbh 6500 with sup720-3cxl

[Rati B. Jokhadze]

Route back that packets to provider and loop them

On 02/09/2015 08:39 AM, John Brown wrote:
> Quick dumb question on S/RTBH.
> I get all the foo around the dynamic nature of using BGP to inject the
> bad prefix (source or dest) we want to drop.
>
> At present we do this with destination dropping / blackholing.   I
> want to drop RFC 1918 sourced packets coming to me at my edge towards
> providers / peers.  I've got one provider sending me nearly 80Mb/s
> worth traffic with the source IP being in Net-10.  Their answer is for
> me to ACL it. ICK
>
> My thought was to enable loose uRPF on the interface  and create a
> static route for net-10 pointing to null0
>
> interface te4/1
>     ip verify unicast source reachable-via any
>
> ip route 10.0.0.0 255.0.0.0 null0
>
> shouldn't that cause net-10 into the FIB with a ptr to null0 and thus
> uRPF will discard ??
>
> Netflow still shows traffic on that interface with source's in Net-10.
>
> I'm either brain dead, my sup720-3cxl is, or ???
>
> thanks
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