nanog mailing list archives
Re: an effect of ignoring BCP38
From: Valdis.Kletnieks () vt edu
Date: Mon, 08 Sep 2008 11:47:53 -0400
On Sat, 06 Sep 2008 06:49:05 PDT, k claffy said:
do that many networks really allow spoofing? i used to think so, based on hearsay, but rob beverly's http://spoofer.csail.mit.edu/summary.php suggests things are a lot better than they used to be, arbor's last survey echos same. are rob's numbers inconsistent with numbers anyone else believes to be true?
You can easily have a network configuration where 95% of the networks do very stringent BCP38 on their customer-facing connections, but the spoofing sources are carefully chosen to be within the 5% of places that aren't filtering... Plus, there's nothing that says that a network can't do BCP38 on 99.998% of its ports, but has a punchout for the 3 or 4 ports that need it for network monitoring/research. So a network could be reported as "non-spoofable" to the MIT project, *and* still provide a sensor machine for the reverse path project...
Attachment:
_bin
Description:
Current thread:
- Re: BCP38 dismissal, (continued)
- Re: BCP38 dismissal Paul Wall (Sep 04)
- Re: BCP38 dismissal Jo Rhett (Sep 04)
- Re: BCP38 dismissal Greg Hankins (Sep 04)
- Re: BCP38 dismissal Paul Wall (Sep 05)
- Re: BCP38 dismissal Gadi Evron (Sep 04)
- Re: BCP38 dismissal Patrick W. Gilmore (Sep 04)
- Re: BCP38 dismissal Gadi Evron (Sep 04)
- an effect of ignoring BCP38 bmanning (Sep 04)
- Re: an effect of ignoring BCP38 David Sinn (Sep 05)
- Re: an effect of ignoring BCP38 k claffy (Sep 06)
- Re: an effect of ignoring BCP38 Valdis . Kletnieks (Sep 08)
- Re: an effect of ignoring BCP38 Jo Rhett (Sep 11)
- Re: an effect of ignoring BCP38 Pekka Savola (Sep 11)
- Re: an effect of ignoring BCP38 Jo Rhett (Sep 11)
- Re: an effect of ignoring BCP38 Pekka Savola (Sep 11)
- Re: an effect of ignoring BCP38 Jo Rhett (Sep 11)
- Re: an effect of ignoring BCP38 Valdis . Kletnieks (Sep 11)
- Re: an effect of ignoring BCP38 Jo Rhett (Sep 11)
- Re: an effect of ignoring BCP38 Pekka Savola (Sep 11)
- Re: an effect of ignoring BCP38 Kevin Oberman (Sep 11)
- Re: an effect of ignoring BCP38 Kevin Oberman (Sep 11)