Switching White Papers
Estimating Router ICMP Generation Delays
Overview A number of Internet measurement techniques rely on eliciting ICMP replies from routers in-side the network. One question regarding the accuracy of these techniques concerns whether routers introduce delays when generating the ICMPs. We present a technique for estimating these delays. The approach is based on sending packets with spoofed source addresses, some with sufficient TTL to travel all the way to the destination (“direct”), others with a limited TTL that will cause them to be transformed at a given hop into an ICMP Time Exceeded (TE) packet. By spoofing the source address of the probes to match the destination, these TEs are routed identically to how the direct probes are routed. The technique thus allows us to factor out effects due to asymmetric routing or conditions on the return path from a given router back to the source.
| Publisher | ICIR (The ICSI Center for Internet Research) | File Format | PDF, requires Acrobat Rdr 5 |
|---|---|---|---|
| Date Published | February 2000 | Downloads | 4 |
| Format | White Papers | ||
| Topics | |||
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