nanog mailing list archives
Re: Request for comment -- BCP38
From: Stephen Satchell <list () satchell net>
Date: Tue, 27 Sep 2016 04:34:15 -0700
I'm trying to come up with a simple picture that embraces all the comments I've seen thus far on the definition of BCP38. The example scenario I'm about to paint may be over-simplified -- but I like to start simple.
Given a single local inside network with: * multiple uplink providers (typical multi-home situation)* multiple edge routers, each connected to an upstream via a public routeable /30, and each further connected to the downstream inside network * 50 subnets (to pick a number) of routeable IP address space downstream from the edge routers, with routing announcements to the world that direct packets back to the edge routers
BCP38 demands that ANY packet leaving ANY edge router to the upstream MUST have a source address:
* within the 50 inside public route-able subnets, or * within a list of "my" addresses in the public /30 subnets. True statement? What am I missing here?(In this simplified view, I'm divorcing the BCP38 aspects from the practical effects of any policy or input filtering done by the upstreams, as I think that's a separate discussion -- important but off-topic right now for my understanding of BCP38 at its core. Those practical aspects can be added later, AFTER describing the basics.)
Current thread:
- Re: Request for comment -- BCP38, (continued)
- Re: Request for comment -- BCP38 Ken Chase (Sep 26)
- Re: Request for comment -- BCP38 Hugo Slabbert (Sep 26)
- Re: Request for comment -- BCP38 Laszlo Hanyecz (Sep 26)
- Re: Request for comment -- BCP38 Mike Hammett (Sep 26)
- Re: Request for comment -- BCP38 Baldur Norddahl (Sep 26)
- Re: Request for comment -- BCP38 Florian Weimer (Sep 26)
- Re: Request for comment -- BCP38 Baldur Norddahl (Sep 26)
- Re: Request for comment -- BCP38 Florian Weimer (Sep 27)
- Re: Request for comment -- BCP38 Jason Iannone (Sep 27)
- Re: Request for comment -- BCP38 Florian Weimer (Sep 27)
- Re: Request for comment -- BCP38 Stephen Satchell (Sep 27)
- Re: Request for comment -- BCP38 Florian Weimer (Sep 27)
- Re: Request for comment -- BCP38 Ken Chase (Sep 26)
- Re: Request for comment -- BCP38 Aled Morris (Sep 26)
- Re: Request for comment -- BCP38 John Levine (Sep 26)
- Re: Request for comment -- BCP38 Laszlo Hanyecz (Sep 26)
- Re: Request for comment -- BCP38 Eliot Lear (Sep 26)
- Re: Request for comment -- BCP38 Mark Andrews (Sep 26)
- Re: Request for comment -- BCP38 Hugo Slabbert (Sep 26)
- Re: Request for comment -- BCP38 John Levine (Sep 26)
- Re: Request for comment -- BCP38 Mike Hammett (Sep 26)
- Re: Request for comment -- BCP38 Hugo Slabbert (Sep 26)