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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: query about determining ingress interface
"--- begin message from Dylan Greene ---" > > On Thu, Jun 20, 2002 at 05:42:23PM -0400, Rajesh Talpade wrote: > > > Is there a way for an ISP to determine the ingress router interface at > > its network border that will carry IP traffic _from_ an IP address not > > owned by it? > > > > I don't want to assume the path is the same in both directions, and tools > > such as CAIDA's skitter plot paths from specific sources. One approach > > might be deriving network paths from CAIDA's data, perhaps someone has > > already done this? > > Rajesh, > > Hi there.. > > Are you asking to determine the interface that "will" or "is" passing said > traffic? the interface that "should be" passing the traffic. in other words, given an IP address, i would like to know what interface traffic from this address should enter my network. i realize the interface may change over time, but can i at least know what interface it is without using filters or logging mechanisms on the actual routers? hence i was alluding to using existing data, such as bgp paths, or caida's database. thanks. rajesh. > I think it depends on what you're trying to do- Are you trying to track > an individual src at one given point, or collect some stats/trends on where > various srcs are entering your network? > > I.e, for an individual src/dst (maybe you're tracing a DoS, etc..) there are > a number of ways to use filters and other mechanisms to log/count packets > matching some known charachteristics (src/dst, length, etc..) > > There are various ways to do things like this, it depends on what exactly you're > trying to track though. > > ..Dylan >
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