[Babel-users] ad-hoc networks behave like mesh using babel?

Matthieu Boutier boutier at pps.univ-paris-diderot.fr
Tue Jan 7 12:53:19 UTC 2014


Hi,

>> Ad-hoc networks do not provide transitive connectivity
>> i.e. if A can see B, B can see C and A cannot see C directly, there will be
>> no automatic route from A to C via B.
> 
> That is correct.  Ad-hoc is a specific mode of 802.11 (Wi-Fi), which
> operates at layer 2 and does not deal at all with routing.

As Baptiste say, "Ad-hoc" is a layer 2 concept: there is no IP address, so there is no route.  (Recall IP is at layer 3.)
	http://en.wikipedia.org/wiki/Wireless_ad_hoc_network

>> What is the role of babel?
>> Does it help provide transitive routing capabilities to ad-hoc networks or
>> does it help improve the routing within a mesh network.
> 
> Babel is a routing protocol.

Note that a routing protocol does not provide IP addresses, but just compute and install the routes in the routers.  IP addresses can be set manually (static addresses), or automatically (you can use ahcpd for mesh networks).

Matthieu




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