[Olsr-dev] Propagating a default gateway OLSRv2

[Peter Emanuel]

I am working on a project that wants to use OLSR to extend the network to
villages in emerging economies. It combines very low cost Raspberry PI's
running Linux using OLSR to build out a network backbone and Android devices
that join the network to  run Android apps. The Android app that uses OLSR
to achieve this was originally using Version 1 of the protocol. For many
good reasons, Version 2 is desired. When using version 1, HNA was utilized
for a particular node to alert other nodes that it could use this node to
route packets to the Internet. A device that has the WiFi connected to the
OLSR adhoc network and has a hardwired Ethernet to the internet is a
candidate for this. A phone with a 3G or 4G cellular connection is also such
a candidate. 

 

.         I have Olsrd2 ported to Android and it is running inside an App on
the Android devices

.         I am using olsrd2_static as it just makes it simpler (at least at
this juncture)

.         I am using fixed IP addresses on the WiFi for now

o   I do really want to have the devices generate their own IP's as this is
a cool version 2 enhancement but haven't gotten that to work yet. Later!

 

The problem is best explained using a simple 2 node network example.

192.168.18.5 is a gateway device. It's hardwired address on eth0 is
192.168.1.115 and its default gateway to the Internet is the router at
192.168.1.1

There is 1 other Android node on the test network - 192.168.18.106

The gateway route on both devices looks like the following:

 

Ip route on gateway

 

default via 192.168.1.1 dev eth0 
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.115 
192.168.18.0/24 dev wlan0  proto kernel  scope link  src 192.168.18.5

192.168.18.106 via 192.168.18.106 dev wlan0  proto 100 src 192.168.18.5
metric 2 onlink

 

Ip route on Android device 192.168.18.106


192.168.18.0/24 dev wlan0 proto kernel scope link src 192.168.18.106

192.168.18.5 via 192.168.18.5 dev wlan0  proto 100 src 192.168.18.106 metric
2 onlink

 

When using HNA on OLSRDv1 with an entry in the conf file like

 

Hna4

{

# Internet gateway

0.0.0.0  0.0.0.0

}

 

a default route on the Android device is added automatically

 

default via 192.168.18.5 dev wlan0 metric 2 onlink

 

It's complete gateway now (using olsrv1) is

 

default via 192.168.18.5 dev wlan0 metric 2 onlink

192.168.18.0/24 dev wlan0 proto kernel scope link src 192.168.18.106

192.168.18.5 via 192.168.18.5 dev wlan0  proto 100 src 192.168.18.106 metric
2 onlink

 

Now the Android device can access the Internet by routing packets through
the gateway.

 

However, I am not able to replicate the same behavior on OLSRDv2. I have
tried using the lan_import plugin but am a little clueless on how to
propagate the default gateway in version 2 from the gateway devices to it's
edge devices.

 

Can someone please help me set up my gateway device properly so the Android
devices can see the Internet?

 

Here is the olsrd2_static -schema output:

 

List of section types:
(use this command with the types as parameter for more information)
    domain (named, default name)
    ff_dat_metric (unnamed)
    global (unnamed)
    http (unnamed): Settings for the http interface
    interface (named)
    lan_import (named)
    log (unnamed)
    mesh (unnamed)
    neighbor_probing (unnamed)

    nhdp (unnamed)

    nl80211_listener (unnamed)
    olsrv2 (unnamed)
    telnet (unnamed): Settings for the telnet interface

And olsrd2_static -version output

 

OLSRd2 version 0.11.1
Git commit: v0.11.1-0-g35a1f94
Visit http://www.olsr.org
Static plugin: auto_111

Static plugin: cfg_compact
Static plugin: class
Static plugin: clock
Static plugin: duplicate_set
Static plugin: ff_dat_metric
Static plugin: http
Static plugin: lan_import
Static plugin: layer2
Static plugin: layer2info
Static plugin: link_config
Static plugin: neighbor_probing
Static plugin: netjsoninfo
Static plugin: nhdp
Static plugin: nhdpinfo

Static plugin: nl80211_listener
Static plugin: olsrv2
Static plugin: olsrv2info
Static plugin: os_clock
Static plugin: os_fd
Static plugin: os_interface
Static plugin: os_routing
Static plugin: os_system
Static plugin: packet_socket
Static plugin: rfc5444
Static plugin: socket
Static plugin: stream_socket
Static plugin: systeminfo
Static plugin: telnet
Static plugin: timer
Static plugin: viewer

 

Thanks for any help forthcoming.

 

Peter Emanuel

 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.olsr.org/pipermail/olsr-dev/attachments/20160706/14949f3a/attachment.html>