AS PATH limits

Sat Sep 30 16:47:26 UTC 2017

I dont see that as the solution. Someone else will offend again.

However, I also don't see trusting major backbones as our filters (for many
other reasons). Our software should be handling what's effectively a buffer overflow
or equivalent (beware long paths that are actually shellcode).

Quagga among others seems to be subject to this bug, pre 0.99.23 or so
(.99.24+ seems ok). So upgrading is a solution.

There was also some chatter on the quagga mailing list on how it's more
pleasant to stab your eyeballs out rather than constructing extremely long
regexp's that might work as a filter.

https://lists.quagga.net/pipermail/quagga-users/2017-September/thread.html

/kc

On Sat, Sep 30, 2017 at 05:30:03PM +0200, Niels Raijer said:
  >My message to NANOG about this from 12:31 UTC today is still in the moderation queue. I had opened a support case with Cogent before writing my message to NANOG and Cogent has let me know approximately 40 minutes ago that they have contacted their customer. 
  >
  >Niels 
  >
  >
  >
  >On 30 Sep 2017, at 17:09, sthaug at nethelp.no wrote:
  >
  >>> If you're on cogent, since 22:30 UTC yesterday or so this has been happening
  >>> (or happened).
  >> 
  >> Still happening here. I count 562 prepends (563 * 262197) in the
  >> advertisement we receive from Cogent. I see no good reason why we
  >> should accept that many prepends.
  >> 
  >> Steinar Haug, Nethelp consulting, sthaug at nethelp.no
  >

-- 
Ken Chase - math at sizone.org  Guelph Canada