Hrm, seems like only the To: and Subject: went through the first time?!? How I do love GUI mail interfaces.......

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From: Deepak Jain Subject: Re: Peering versus Transit Date: Sunday, September 29, 1996 5:31 PM

From: Deepak Jain Subject: Re: Peering versus Transit Date: Sunday, September 29, 1996 5:31 PM

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What are the various opinions on this behavior?

Well, in most cases, the major provider will have a policy that states something like, "you are either a peer or a customer, pick one." Some providers MAY allow you to do both, under certain circumstances. As an upstream provider, allowing someone to peer while also buying transit requires special management. I would suggest two things. 1. If the ISP is using BGP for both sessions, have the ISP use two seperate AS numbers. 2. Have the ISP provide you a list of the specific routes of said ISP and ISP's customers, and implement a set of IP filters based on origin at your peer router. #1 really doesn't gain you much, but it does provide some assistance in trouble shooting a routing problem with the Peer/Customer. #2 is the big help. If the customer tries to default to you over the peer link, you would only take "peer" traffic. Also, it puts the onus of correct and sane route management on the Peer/Customer. If they don't manage thier routes correctly, they will experience some hard to trace routing problems. Chris A. Icide Nap.Net