[OLSR-users] LQ Routing and 802.11b Link Speed

[Bruno Randolf]

are you sure you do not NAT on every hop?

we had a similar problem once in berlin (http://olsrexperiment.de) and NAT was 
the reason: when the route changes the NAT breaks the connection. now that 
NAT is turned off, we can ssh over several (6+) hops.

bruno

On Wednesday 15 June 2005 15:30, Andrew Hodel wrote:
> In my experience, LQ is not stable.  Anything that uses a stream fails
> withing a few minutes over a 2+ hop link (even ssh).  I have tried
> different settings and still nothing.  I am going to switch the entire
> network to hysteresis and work with that next.  If I still get
> nothing, I will try IP6.
>
>
>
> Andrew
>
> On 6/15/05, Holger Mauermann <(spam-protected)> wrote:
> > Holger Mauermann wrote:
> > > What about measuring not only the packet loss, but also the round
> > > trip time to the neighbors?
> >
> > Forget my last post. The RTT depends on the link load and leads to very
> > frequent route changes...
> >
> > However, recently I read something about Packet-Pair based bandwidth
> > estimation and Expected Transmission Time (ETT) and it looks very
> > interesting. Consider the following real life example with 3 links:
> >
> > A-B: 24 Mbps, ETX 1.0
> > A-C:  1 Mbps, ETX 1.5
> > B-C: 11 Mbps, ETX 1.0
> >
> > To reach C from A olsr currenty prefers the short, bad 1 Mbps link. With
> > ETT it could use the two fast links A-B and B-C because the total ETT is
> > only 2.5 ms instead of 15 ms:
> >
> > ETT = ETX * S / B       S = Packet size, B = Bandwidth
> >
> > A-B: ETT 0.8 ms (S = 1 KByte, B = 1200 kByte/s)
> > A-C: ETT  15 ms (S = 1 KByte, B =  100 kByte/s)
> > B-C: ETT 1.7 ms (S = 1 KByte, B =  600 kByte/s)
> >
> > Any ideas if this could be implemented in olsr?
> >
> > --
> > \-- Holger Mauermann
> >   \-- (spam-protected)
> >    \-- PGP Key Id: 0x8EA8C301
> > _______________________________________________
> > olsr-users mailing list
> > (spam-protected)
> > https://www.olsr.org/mailman/listinfo/olsr-users
>
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