On Friday 13 August 2010 20:18:33 Vasiliy Kulikov wrote: > d) Why do you send icmp TTL exceeded for the icmp itself? E.g. in case > of loop or/and small default TTL you'll probably get a storm of icmps. > Exactly in this case IP silently drops TTL exceeded icmps ;) These layer2 icmp packets are not ordinary icmp packets. We needed to provide a mechanism to make the network topology visible to debug tools like ping or traceroute which normally "see" no more than one hop as they operate on layer3. Hence, batman-adv does not send an icmp packet for each payload TTL exceeded but for traceroute only. I recommend reviewing the traceroute code to understand how this is supposed to work: http://www.open-mesh.org/browser/trunk/batctl/traceroute.c I'd be interested to learn about a problematic scenario in which this mechanism breaks. Regards, Marek _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
