Re: AT&T carrying rfc1918 on the as7018 backbone?

RFC1918 addresses are unpredictable on any network other than your own. You shouldn't make assumptions about them. Anyone may use them for any purpose on their network. If you send packets into their network using RFC1918 addresses, you get whatever you get. If you require certaintity its up to you to impose your policy at your edge.

Does sending packets to RFC1918 addresses on other networks meet the "be conservative in what you send" credo?

I understand all that. We're working with the customer to harden the border (ACLs) and possibly take a bogon feed, etc. I was just having a hard time believing AT&T was leaking 10/8 and that any other large provider was accepting it so wanted to verify. -b