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- Pinging the routers along the route to see if any of them respond with duplicates. Examples: Duplicate pings from SLAC to realimage.realnet.co.sz , www.lonab.bf.
- Capture the ping packets and look to see if all the packets are returned from the same Ethernet address. See the example examples of SLAC to CERN and SLAC to www.lonab.bf where in both cases all responses are from the same IP address 137.138.144.168.
- Do multiple hosts at a site/network domain/subnet return duplicate packets? For example www.cern.ch (137.138.144.16) gives 3 pings in response to each one sent, while ping.cern.ch (137.138.28.176) and pinger.cern.ch (192.91.244.6) see no duplicate pings.
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