North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Packets from net 10 (no, not the lyrics)
On Tue, 23 Sep 1997 [email protected] 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 [email protected] 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
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