| | 177 | |
| | 178 | == Troubleshooting Connectivity Problems == |
| | 179 | |
| | 180 | * '''If you cannot run ''wimaxcu ron'' after loading the modules correctly:''' In order to use the WiMAX Configuration Utility, the WiMAX daemon needs to be running. Usually, the daemon initializes when the modules are loaded. However, occasionally they do not load. Always check that they are loaded by issuing ''"wimaxd"''. |
| | 181 | |
| | 182 | * '''If you can run ''wimaxcu ron'' and can assign an IP address but cannot ping the other node(s):''' Usually, this is due to a problem at either the network or physical layers, but unfortunately, it's difficult to readily know which offhand. Due to the different functions of sandbox 4, which contains both an RF Attenuator Matrix, and a programmable base station, it can sometimes be necessary to confirm both are at the desired settings before proceeding. However, the more serious networking problems both can cause cannot be quick-fixed by resetting the stations. They must be manually troubleshot. Below are some suggestions. |
| | 183 | |
| | 184 | '''Base Station IP's''': Sometimes a previous experimenter has given the base station a different set of IP addresses to permit connectivity than the recommended defaults. When this happens, the base station will reject connections from the 'foreign' nodes. Some commands of interest are below. They follow standard base station command and syntax conventions. |
| | 185 | |
| | 186 | {{{ |
| | 187 | wget -qO- http://cons-wm-01:5052/wimaxrf/client/status |
| | 188 | wget -qO- http://cons-wm-01:5052/wimaxrf/client/add... |
| | 189 | wget -qO- http://cons-wm-01:5052/wimaxrf/client/delete... |
| | 190 | }}} |
| | 191 | |
| | 192 | '''RF Attenuater Matrix Couplings''': Unique to sandbox 4, there is a hardware attenuator matrix which can physically weaken signals between the nodes of the test bed. Previous experimenters' values will be left on the matrix, and if they happened to set the matrix to a very high level of attenuation, it's likely that the affected nodes will be too attenuated to successfully transmit signals. Below are the conventions currently used to check and change the modulation between any pair of nodes. |
| | 193 | |
| | 194 | {{{ |
| | 195 | wget -qO- http://internal2dmz.orbit-lab.org:5052/instr/status |
| | 196 | wget -qO- http://internal2dmz.orbit-lab.org:5052/instr/get?portA=X\&portB=Y |
| | 197 | wget -qO- http://internal2dmz.orbit-lab.org:5052/instr/set?portA=X\&portB=Y\&att=0 |
| | 198 | }}} |
| | 199 | |
| | 200 | ---- |
