[OLSR-users] Regular data broadcasting in ad hoc networks

Sven-Ola Tuecke (spam-protected)
Sat Dec 18 16:00:14 CET 2004


long answers may be found in RFC 922 (google for rfc-922). The relevant 
statement is: <cite>The primary rule for avoiding loops is "never broadcast 
a datagram on the hardware network it was received on"</cite>. Because every 
routing protocol (such as OLSR) only configure the underlying network 
layers, the RFC 922 rules are still valid.

Moreover: ETH/Wlan-bridged devices may have broadcasting loops, if you 
connect them with an ethernet cable. A broadcast packet will loop through 
WLAN->eth->eth->WLAN->WLAN->eth->eth etc. until the TTL is used up. TTL is 
ususally above 30.


"lolo" <(spam-protected)> schrieb im Newsbeitrag 
> Hi all
> This maybe has been answered many times and everywhere but i can't find a 
> short and final answer to that basic question :
> In an ad hoc network, with a routing protocol installed on every node, all 
> the nodes having a valid address in the same common subnetwork, 
> for example, would a basic broadcast message will be 
> (re)transmitted to every member of the subnet as in a wired network 
> segment ? a crude command sample could be ping -b or more 
> useful ones like iperf or netperf
> I would accept long answers too... ;-)
> Regards
> Laurent
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