On Tue, 23 Sep 1997 bmanning@ISI.EDU wrote:
What about providers that use portions of the private address space on their network (up to and including the client's serial interface)?
Mohamad
On Tue, 23 Sep 1997 bmanning@ISI.EDU wrote:
Should I be filtering all reserved space at my border, or would it be reasonable for me to expect the big guys not to take packets with clearly inappropriate source addresses?
Yes you should. (and with kudos to Andrew)
[ access lists deleted ]
The operative phrase here is border. That means ASN border, i.e. where you BGP peer with others. At the provider/subscriber interface, within your IGP, using RFC 1918 space is ok.
I agree if BGP is running between the customer and the provider. However, if: - both the provider *and* the customer are using the same private address space *and* - the provider assigns the p2p link addresses from that same address space (according to its own subnetting plan) the question becomes: where do you apply the filters? Is it safe for the provider to assume, in the first place, that its use of private addresses should extend to customer networks? Mohamad