Not announcing (to the greater internet) loopbacks/PTP/infra - how ?

Radu-Adrian Feurdean nanog at
Sat Oct 6 08:24:46 UTC 2018

On Thu, Oct 4, 2018, at 21:53, William Herrin wrote:
> On Thu, Oct 4, 2018 at 3:10 PM Brandon Applegate <brandon at> wrote:
> >   - Traceroutes are miserable.
> Also breaks PMTUD which can break TCP for everybody whose packets
> transit your router. So don't do this.

... unless you happen to provide a "MTU1500" service over a jumboframe (more than 9100) backbone, which you can very easily do these days. In which case fragmentation/packet too big should never occur.

Traceroutes remain miserable, at least from outside towards your network. 

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