[Olsr-users] OLSR Gateway & HNA Question

[Alexander Morlang]

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Bhat, Ishwara schrieb:
> Hi,
> 
> I am continuing an old thread and I have another question in that
> context.
> 
> My scenario is as below:
> 
> I have a PC with ad-hoc link (but no OLSR, no second NIC). And I have
> nodes running OLSR within single-hop distance from this ad-hoc PC.
> 
> All are in the same SSID and same subnet.
> 
> So PC to send packet to  any OLSR node, probably it is easy.
> 
> But the question is -
> 
> How to ensure route for the backward path for the non-OLSR PC in the
> same subnet (or a different subnet?)??

set up an HNA for that PC.

> 
> 
> I understand that HNA can be setup if I had a gateway node in between
> PC and the mesh. But my case is that I have an IP address belonging
> to the same subnet but without OLSR.

usually, you have that case when you run dhcp on your wireless interface
while running olsrd on the same wireless interface.

so you have to announce the range of you dhcp-server per HNA to announce
the route back.
if your dhcp range is outside of the iprange used in the mesh network,
you might need an alias ip and and a resulting netroute to that interface.

> 
> For the OLSR node within 1-hop distance from PC, will I be able to
> force a TC announcing that it can route to the PC ?
> 

the HNA will do that.

> Please tell me how to do it.
> 
> Thanks for the help! Ishwar

n.p.

> 
> 
> 
> -----Original Message----- From: Henning Rogge [mailto:(spam-protected)]
>  Sent: Tuesday, November 18, 2008 8:50 PM To: Bhat, Ishwara Cc:
> (spam-protected) Subject: Re: [Olsr-users] OLSR Basic Block
> Diagram
> 
> Am Tuesday 18 November 2008 14:15:20 schrieb Bhat, Ishwara:
>> Thanks a lot Henning. 2 more questions.
> First just a comment... please reply mails like this back to the
> list, so anyone can read them.
> 
>> Case #1: External machine without OLSR:
>> 
>> Let us say my external machine has 802.11 interface and is in
>> ad-hoc mode. Also it has the same SSID as that of mesh nodes.
>> 
>> In this arrangement, would the packet not get into mesh through a 
>> "peripheral node"?
> You could send a package to the OLSR subnet and the OLSR nodes would
> "grab the package" and retransmit it to it's final destination, but
> unless you are in direct radio range of your target it would have no
> way to send an answer.
> 
>> For return path, do I still need to setup HNA entry ? Or would it
>> fbod the packet throughout the network (though each node does not
>> know the route ?
> Because no OLSR node has a route with gateway (next hop) for your net
> you would only get the answer if you can answer the ARP request of
> the target of your original package (direct communication range).
> 
>> Case # 2: External machine with OLSR:
>> 
>> In this case, I have one wired interface and one 802.11 interface.
>> OLSR's primary (only) interface is 802.11.
>> 
>> And I setup bridge between wired and wireless interfaces.
>> 
>> Would this solve my issue of finding routes for all cases ?
> A bridge is no router, so there would still be not multihop traffic
> flow between the two networks, unless you set a HNA entry and a route
> I think.
> 
> Henning
> 
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> 

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