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Emulab FAQ: Troubleshooting: My experiment is set up, but I cannot send packets between some of the nodes. Why?

Emulab FAQ: Troubleshooting: My experiment is set up, but I cannot send packets between some of the nodes. Why?

The most common reason is that your topology includes nodes which are not directly connected, and you have not setup any routing. Refer to "How can I turn on routing or set up routes automatically in my nodes?" for details. If you cannot send packets between two machines which are directly connected (via a link or a lan), then there are two possibilities: either the nodes did not properly negotiate their speed and duplex with the Cisco switch, or the physical wire is loose or bad. In these cases, you should contact us for help.