[MVMA] Tunnels .vs. RF revisited

[Tyler Gardner]

Chuck,

From what I have learned in the GitHub discussion, link cost is an estimate of expected packet loss. So it sounds like having user defined weights may produce unintended results.

Tyler Gardner
KI7ODK

> On Aug 18, 2022, at 6:56 AM, Chuck Gelm <nc8q-aredn at gelm.net> wrote:
> 
>  Testing the link latency between nc8q-services and ( w8bi-dara-services and n8jj-services )
> with and without tunnel between nc8q and n8jj:
> 
> Tunnel from nc8q to n8jj disabled:
> gelmce at nc8q-mesh:~$ mtr -w -c 9 n8jj-services
> Start: 2022-08-18T06:28:13-0400
> HOST: nc8q-mesh                                        Loss%   Snt   Last   Avg  Best  Wrst StDev
>   1.|-- localnode.local.mesh                              0.0%     9    0.5   0.5   0.5   0.6   0.0
>   2.|-- dtdlink.NC8Q-Kettering-Centerville.local.mesh     0.0%     9    0.8   0.8   0.7   0.9   0.1
>   3.|-- NC8Q-Centerville-Kettering.local.mesh             0.0%     9    1.9   2.0   1.9   2.3   0.1
>   4.|-- dtdlink.NC8Q-Centerville-HuberHeights.local.mesh  0.0%     9    2.2   2.3   2.1   2.9   0.3
>   5.|-- NC8Q-HuberHeights-Centerville.local.mesh          0.0%     9    3.5   3.8   3.4   4.9   0.5
>   6.|-- dtdlink.W8BI-DARA-Services.local.mesh             0.0%     9    3.9   4.3   3.5   7.5   1.3
>   7.|-- N8JJ-Services.local.mesh                          0.0%     9   43.5  44.3  42.9  48.6   1.9
> gelmce at nc8q-mesh:~$ 
> -----
> Tunnel from nc8q to n8jj enabled:
> gelmce at nc8q-mesh:~$ mtr -w -c 9 n8jj-services
> Start: 2022-08-18T06:31:16-0400
> HOST: nc8q-mesh                   Loss%   Snt   Last   Avg  Best  Wrst StDev
>   1.|-- localnode.local.mesh         0.0%     9    0.5   0.5   0.3   0.6   0.1
>   2.|-- dtdlink.NC8Q-hAP.local.mesh  0.0%     9    0.8   0.8   0.7   0.9   0.1
>   3.|-- 172.31.187.149               0.0%     9   45.8  44.5  42.1  47.2   1.9
>   4.|-- N8JJ-Services.local.mesh     0.0%     9   43.3  44.5  42.3  49.3   2.6
> gelmce at nc8q-mesh:~$ 
> 
> Note that the latency between nc8q and n8jj is, more or less, equal via tunnel or 3 RF hops and 3 DtD links.
> -----
> 
> Testing over a 16 mile link:
> Tunnel from nc8q to n8jj enabled:
> gelmce at nc8q-mesh:~$ mtr -w -c 9 w8bi-dara-services
> Start: 2022-08-18T06:32:34-0400
> HOST: nc8q-mesh                        Loss%   Snt   Last   Avg  Best  Wrst StDev
>   1.|-- localnode.local.mesh              0.0%     9    0.5   0.5   0.3   0.6   0.1
>   2.|-- dtdlink.NC8Q-hAP.local.mesh       0.0%     9    0.7   0.8   0.7   0.9   0.1
>   3.|-- 172.31.187.149                    0.0%     9   46.2  45.2  42.0  47.4   2.0
>   4.|-- dtdlink.N8JJ-Services.local.mesh  0.0%     9   47.0  45.5  42.6  48.6   2.2
>   5.|-- W8BI-DARA-Services.local.mesh     0.0%     9   82.2  83.9  81.4  87.6   2.3
> 
> Tunnel from nc8q to n8jj disabled:
> gelmce at nc8q-mesh:~$ mtr -w -c 9 w8bi-dara-services
> Start: 2022-08-18T06:35:30-0400
> HOST: nc8q-mesh                                        Loss%   Snt   Last   Avg  Best  Wrst StDev
>   1.|-- localnode.local.mesh                              0.0%     9    0.5   0.5   0.5   0.6   0.0
>   2.|-- dtdlink.NC8Q-Kettering-Centerville.local.mesh     0.0%     9    0.8   0.8   0.7   0.9   0.1
>   3.|-- NC8Q-Centerville-Kettering.local.mesh             0.0%     9    1.9   2.0   1.9   2.5   0.2
>   4.|-- dtdlink.NC8Q-Centerville-HuberHeights.local.mesh  0.0%     9    2.2   2.4   2.2   2.9   0.2
>   5.|-- NC8Q-HuberHeights-Centerville.local.mesh          0.0%     9    3.4   3.7   3.3   4.2   0.3
>   6.|-- W8BI-DARA-Services.local.mesh                     0.0%     9    6.5   5.0   3.7   6.8   1.3
> gelmce at nc8q-mesh:~$ 
> 
> Not that latency increases 16X with 2 tunnels .vs. 3 RF and 2 DtD hops.
> 
> IMHO and regardless of complexity,
> 99% of tunnel.vs.RF routing issues are solvable if the tunnel weight was a user editable setting.
> 
> Chuck
> 
> 
> 
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