[Olsr-users] olsrd settling time

Eric Malkowski (spam-protected)
Wed Oct 29 18:43:49 CET 2008

You've got me curious - I've always run my mesh network with each node 
having an IP all on the same subnet with the underlying wireless being 
setup for Ad-hoc mode (Atheros MADWIFI 0.9.4 branch).  I've found that 
using the standard broadcast address for the single subnet works just fine.

i.e. If I were to do your configuration I would do something like:

Node 1:  mask  broadcast  (on 
interface ath1)
Node 2:  mask  broadcast  (on 
interface ath1)
Node 3:  mask  broadcast  (on 
interface ath1)
Node 4:  mask  broadcast  (on 
interface ath1)

I then have separate radios that are 2.4 ghz subnets configured as HNAs 
in olsr configuration.  They use the strategy 10.2.X.1 where X is the 
node number and they are each on interface ath0.  So for Node 1 he would 
use on ath0 for his presence on the 2.4 ghz subnet and hand out 
IP addresses in DHCP range - for anyone who wants 
to get on that node w/ standard 2.4 ghz gear.  I run my mesh at 5 ghz to 
stay out of the way of the 2.4 stuff.  The other nodes would realize 
through HNA that subnet is available via on the mesh.

I'm curious why you needed to set your broadcast address to an all 1's 
setup ( to make things work?

The only situation I could think of is if a bunch of ad-hoc nodes are on 
** different ** subnets but still "peering" with OLSR.

Node 1:  mask  broadcast
Node 2:  mask  broadcast
Node 3:  mask  broadcast
Node 4:  mask  broadcast

I could see the need to have a couple of different Mesh subnets to 
logically divide up the network, but if a lot of nodes are needed beyond 
a Class C for instance, a Class B setup could be used.

The above seems odd to me and note that I've never tried it -- so don't 
assume it would work.  I'll be curious to hear what the folks on the 
list think.


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