Packet over SONet/SDH (POS) experience?
William Allen Simpson
wsimpson at greendragon.com
Mon Oct 20 16:47:43 UTC 1997
> From: rja at corp.home.net (Ran Atkinson)
> To: nanog at merit.edu, ietf-ppp at merit.edu
> Cc: wsimpson at greendragon.com, pppsdh at greendragon.com
> On Oct 19 8:12, William Allen Simpson wrote:
> % Has anyone (that has deployed) been having incident reports?
> There are known operational incidents where an adversary sent
> an IP packet designed to set the SONET scrambling algorithm ["f(x)"]
> to all zeros. This caused the SONET device to lose communications
> syncronisation and the circuit to go down, requiring a manual reset.
> Truly an ugly situation.
- what dates?
- which circuit paths?
- which vendor equipment?
- from whence we will derive, which vendor chipset?
> I've known about this issue ever since the PPP/SONET spec was
> published, but have withheld public comment until someone else
> mentioned the issue on a public list.
Too bad you were not involved in the discussion 3-5 years ago....
> PS: I'm not on the PPP or PPPSDH lists, so if folks on those lists
> want me to see any followups, those folks will need to Cc: me
> PPS: The followups list definitely will need trimming. Please
> edit appropriately if you followup...
Ran, the original did not have those followups, and I'm kind of annoyed
that you added them.... I really did _not_ need 4 copies, and I expect
that the other NANOG folks will be less than enthused as well!
WSimpson at UMich.edu
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