Wait till STIR/SHAKEN is enabled. Were going to see real quickly who isn't handling fragmentation correctly.......
On Wed, Oct 2, 2019 at 8:34 AM Saku Ytti <s...@ytti.fi> wrote: > Hey Phil, > > > At some point over night on 30th September (i.e. the night going into > 1st October), we saw a number of Spectrum (Charter) customers stop handling > fragmented UDP packets. This has manifested itself in such that the phones > of affected customers are no longer receiving UDP SIP INVITE packets which > exceed whatever their WAN side MTU is. We've so far had 6 customers report > the issue - we can see that the last call on 30th September worked and the > first and subsequent calls on 1st October failed. > > > > Is anyone aware of an update to CPE devices pushed out that night which > may have broken their ability to handle IP fragmentation? > > I don't know anything specific to this case, but you'd serve your best > interest to send small enough packets that do not need fragmentation, > particularly in the backbone. Even devices often considered SP > quality, such as ASR9k, fragment in the linecard CPU, giving very poor > service quality compared to sending two packets not fragmented. > > While we can say this should just work, the reality is, it's not very > reliably true and I would not build product or business on the > assumption that it works well. > -- > ++ytti >
