I'm not saying anyone is wrong here. I merely want to point out eventual incompatabilities. So please don't get me wrong. Regards, Marc
On 1 juin 2016, at 23:46, William Herrin <bill@herrin.us> wrote:
On Wed, Jun 1, 2016 at 3:16 PM, Marc Storck <mstorck@voipgate.com> wrote:
.-----------------. | | | B |--------- D S ---------| A R | | C |--------- (toward S) | | `-----------------'
With BCP38 in mind, could there be situations where Router R is not allowed to source packets with address A out of interface C?
Hi Marc,
I think you're right. Address A in a /30 from ISP A. ISP C accepts source addresses from your /24 but not the A /30. So if the router does not follow the RFC (sends an ICMP packet out C with a source address from A), typical asynchronous routing can result in black-holding the ICMP error message.
You've hit on a good reason to follow the RFC by default instead of doing what Randy wants. ;)
-Bill
-- William Herrin ................ herrin@dirtside.com bill@herrin.us Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>