Repository : ssh://git@open-mesh.org/doc

On branches: backup-redmine/2019-09-14,master

commit 383c09fbf35cab6511af6441421aeef53ef10d37 Author: Linus Lüssing linus.luessing@c0d3.blue Date: Sat May 4 00:19:48 2019 +0000

doc: batman-adv/Broadcast

383c09fbf35cab6511af6441421aeef53ef10d37 batman-adv/Broadcast.textile | 34 +++++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 9 deletions(-)

diff --git a/batman-adv/Broadcast.textile b/batman-adv/Broadcast.textile index e6ba4b0..1275f14 100644 --- a/batman-adv/Broadcast.textile +++ b/batman-adv/Broadcast.textile @@ -21,14 +21,6 @@ Furthermore, for the second and third broadcast a delay of 5ms is applied for ea

Last but not least 802.11 broadcasts are usually performed at the lowest Wifi bitrate. If a high broadcast throughput is needed, it is therefore usually recommended to increase the Wifi rate for multicast transmissions in the wifi driver.

-h2. Gateway Feature: DHCP Optimizations - -todo - -h2. IP Multicast Optimizations - -todo - h2. Broadcast Avoidances

To reduce the number of (re-)broadcasts batman-adv tries to detect whether in a particular scenario on a specific interface a broadcast can be avoided. @@ -57,6 +49,30 @@ h3. I.III) Single Neighbor: Is Previous Sender

!bcast-avoid-single-fwd.png!

-h2. __noflood__ Firewall Tagging +_A node avoiding to echo back to its forwarder_ + +* If an interface has just one neighbor and it matches the originator that forwarded this OGM2 or broadcast packet to us, then no broadcast is necessary. + +We can avoid echoing a packet back to the originator node (not just neighor) it was forwarded from. + +h2. Non-flooding Optimizations + +Broadcast flooding comes with a cost: It bothers every node in the mesh and especially in larger mesh networks this can add up quickly. Therefore if the number of nodes interested in a specific frame is actually just a small subset of all nodes then it is usually desirable to use a more specialized approach. + +Currently, batman-adv applies such specialized treatment for DHCP, ARP and general IP multicast: + +h3. Gateway Feature: DHCP via Unicast + +todo + +h3. Distributed ARP Table: DHT and Caching + +todo + +h3. IP Multicast Optimizations + +todo + +h3. __noflood__ Firewall Tagging

todo \ No newline at end of file