80 lines
3 KiB
Markdown
80 lines
3 KiB
Markdown
# EMANE Procomputed
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* Table of Contents
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{:toc}
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## Overview
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Introduction to using the precomputed propagation model.
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[EMANE Demo 1](https://github.com/adjacentlink/emane-tutorial/wiki/Demonstration-1)
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for more specifics.
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## Run Demo
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1. Select `Open...` within the GUI
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1. Load `emane-demo-precomputed.xml`
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1. Click 
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1. After startup completes, double click n1 to bring up the nodes terminal
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## Example Demo
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This demo is uing the RF Pipe model witht he propagation model set to
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precomputed.
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### Failed Pings
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Due to using precomputed and having not sent any pathloss events, the nodes
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cannot ping eachother yet.
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Open a terminal on n1.
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```shell
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root@n1:/tmp/pycore.46777/n1.conf# ping 10.0.0.2
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connect: Network is unreachable
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```
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### EMANE Shell
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You can leverage `emanesh` to investigate why packets are being dropped.
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```shell
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root@n1:/tmp/pycore.46777/n1.conf# emanesh localhost get table nems phy BroadcastPacketDropTable0 UnicastPacketDropTable0
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nem 1 phy BroadcastPacketDropTable0
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| NEM | Out-of-Band | Rx Sensitivity | Propagation Model | Gain Location | Gain Horizon | Gain Profile | Not FOI | Spectrum Clamp | Fade Location | Fade Algorithm | Fade Select |
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| 2 | 0 | 0 | 169 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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nem 1 phy UnicastPacketDropTable0
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| NEM | Out-of-Band | Rx Sensitivity | Propagation Model | Gain Location | Gain Horizon | Gain Profile | Not FOI | Spectrum Clamp | Fade Location | Fade Algorithm | Fade Select |
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```
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In the example above we can see that the reason packets are being dropped is due to
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the propogation model and that is because we have not issued any pathloss events.
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You can run another command to validate if you have received any pathloss events.
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```shell
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root@n1:/tmp/pycore.46777/n1.conf# emanesh localhost get table nems phy PathlossEventInfoTable
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nem 1 phy PathlossEventInfoTable
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| NEM | Forward Pathloss | Reverse Pathloss |
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```
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### Pathloss Events
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On the host we will send pathloss events from all nems to all other nems.
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> **NOTE:** make sure properly specify the right control network device
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```shell
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emaneevent-pathloss 1:2 90 -i <controlnet device>
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```
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Now if we check for pathloss events on n2 we will see what was just sent above.
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```shell
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root@n1:/tmp/pycore.46777/n1.conf# emanesh localhost get table nems phy PathlossEventInfoTable
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nem 1 phy PathlossEventInfoTable
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| NEM | Forward Pathloss | Reverse Pathloss |
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| 2 | 90.0 | 90.0
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```
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You should also now be able to ping n1 from n2.
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```shell
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root@n1:/tmp/pycore.46777/n1.conf# ping -c 3 10.0.0.2
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PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.
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64 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=3.06 ms
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64 bytes from 10.0.0.2: icmp_seq=2 ttl=64 time=2.12 ms
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64 bytes from 10.0.0.2: icmp_seq=3 ttl=64 time=1.99 ms
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--- 10.0.0.2 ping statistics ---
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3 packets transmitted, 3 received, 0% packet loss, time 2001ms
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rtt min/avg/max/mdev = 1.991/2.393/3.062/0.479 ms
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```
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