[Olsr-users] olsr and the netmask

[Markus Kittenberger]

in a mesh network, neither .. /16 or /17 or /18 ... /30 or /32 is correct,
but usually anything (which is not too big) works..  (if the mesh routing
software (e.g. olsrd) does work)

e.g. with a netmask of /32 you infact define that a node has no neighbours!
(as its alone in its own network, and there is no network-route to anyone)
and u need a mesh routing software to add known neighbours,.. (and host
routes to them)

while e.g. if u use a /24, the node has a network route to this /24, and
thinks it has up to 255 neighbours (in its subnet) which are one hop away
(which is usually wrong!)
so you need to add a mesh routing software to add routes (via correct
direct neighbours) to the nodes that are multiple hops away (else this node
will try and (most often) fail to communicate directly with all neighbours
within the subnet)

main difference (regarding unwanted side effects), in the latter case you
have unwanted packets (e.g. many/repeated stupid arp-requests), while in
the first u have no change to communicate from one hop to its direct
neighbour if the mesh routing software e.g. crashed

i hope this clarified things, if not:

yes u are overthinking,... (-;

Markus

(btw did u mange to ping between 2 nodes (without olsrd) via adhoc already?)

On Fri, Feb 10, 2012 at 8:52 PM, Hans-Christoph Steiner <
(spam-protected)> wrote:

>
> Maybe I'm overthinking this, but I can't seem to wrap my head around what
> each computer should have set for its netmask. It seems to me that each
> node on the network should have a netmask of 255.255.255.255 since each
> node has an entry individually.  But then I see that mesh networks use a
> defined set, like 10.10.0.0/16.  Is that just to define an IP for a given
> mesh?  Or should each computer also have a netmask of 255.255.0.0?
>
> .hc
>
>
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