[Olsr-users] Routing problem with bad ETX

[Saverio Proto]

You need to adjust your multicast rate.
Btw 0.6.3 olsrd is very old. Please use this feed to compile latest version:

https://github.com/openwrt-routing/packages

best regards

Saverio Proto


2013/4/30 Simon Ebnicher <(spam-protected)>:
> Hi,
> we have set up a small OLSR mesh network with three routers (TP-Link
> TL-WDR3600 running OpenWrt 12.09rc1, olsrd 0.6.3). We placed two routers
> near to each other, and the third router at quite some distance.
> R1 <----ETX:~1----> R2 <---------------ETX: 1.x to 2.x-----------> R3
>
> The ETX on the direct link between R1 and R3 is usually below 2 (about
> 1.3 to 1.7), so the direct route is preferred. However, the direct route
> is completely unusable for data transfer (e.g., ping reports >95% packet
> loss). As soon as two hop route via R2 is used, ping and other traffic
> works fine.
> We are wondering why the unreliable link is rated too optimistically. We
> suspect that the Hello and TC multicast packets (which are used to
> calculate the ETX) may have a better reception probability than unicast
> packets (e.g., because they are sent at lower rates, no RTS/CTS). This
> would lead to ETX values that do not reflect the link accurately.
>
> Can anyone confirm or explain this behaviour and maybe offer a solution?
>
> Best regards,
> Simon Ebnicher
>
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