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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: On the back of other 'security' posts....
>That depends on your definition of edge, I suppose. I define it as the >port on one of my routers where the other end of the link is connected >to a machine I don't control. In those terms, edge filtering makes sense >in some cases and not in others. If it's a dial-up or T1 customer which is >a single business, it makes sense. If it's an ISP with a few fortune 500 >customers, it doesn't work out as well. I agree. In the satellite world, such filtering is extremely difficult due to the asymmetric nature of the traffic. A common scenario is that the customer will receive packets from upstream via Provider A to addresses assigned by Provider A. The customer will send packets upstream through Provider B with source addresses belonging to Provider B. If Provider B implements edge filtering, then the only way round is to use GRE tunnels, which gets messy. -- John Greenhalgh |