Re: PMTUD for IPv4 Multicast - How?

[Masataka Ohta <mohta () necom830 hpcl titech ac jp>]

Chris Marget wrote:
> > > I'll probably come around, but I've not yet concluded that "screw it,
> > > fragment my traffic, I don't care" is the stance that a conscientious
> > > application should be taking.
> >
> > Don't you care, for routers, generating ICMP PTB is as burdensome
> > as generating fragments?
>
> I don't think so. If PMTUD is working (big IF, I know),

Yup.

> the ICMP PTB
> generation is a one-time thing (or once per 10 minutes or whatever)

A meaningful interval of retry is not 10 minutes but RTT measured
at layer 4 or above.

> Is the concern that I might DDoS myself

Or, with spoofed source addresses, someone else.

                                                Masataka Ohta