[Olsr-users] Freifunk mesh set up

Sven-Ola Tuecke (spam-protected)
Mon Oct 1 07:49:03 CEST 2007


that little howto suggests using 104.x.x.x adresses. Thats not wrong but has
a small disadvantage: They may be used in the internet one day. We use
104.x.x.x in Berlin for historic reasons and too many node owners to
convince so that IP allocation will stay in force. But I always recommend
using other IPs for a new mesh, e.g. 10.x.x.x.

You know the ping command - that's fine <ggg>. To be honest: there are
plenty of pitfalls you may stumble across. Look at the admin page (the page
displayed if you click on the top "admin" link. All entries should show a
green OK sign. 

The OLSR-DHCP function only does it's job, if you installed
the "freifunk-recommended-en" package. For a first-timer, I would not
recommend using this, because most newbies do not understand the underlying
IP calculation. They do not understand the output of the "ipcalc" command
and this alone leads to a lot confusion). Also: DHCP attracts brain-dead
software and users in the neighbourhood - which may or not may be your
intention. Simply attach a notebook to one of the LAN ports instead. Yes:
this requires the blue cable <ggg>

Do *not* change the local LAN IP address. This should stay "static" and with Do not try to set a manual default route.
Check the status page: Is the other WRT is in the neighbours list? Also
check the wireless status on the status page. All fine?

P.S.: If you cannot connect nor ping, I will need more info. Grab a PuTTY,
connect to one of the WRTs using SSH. Then enter these commands, cut-copy
the output to clipboard and send it along with your next query (if

wl status
ip a
nvram show | sort

(Latter command output may need editing to remove your passwords)

// Sven-Ola

Szili Dávid wrote:
> Hi,
> because of my German is not so good, I've decided to ask for help here
> first, before I take a look around at the Freifunk mailing lists.
> I'm pretty newbie to OLSR and Freifunk and I'm not a networking expert,
> but I'm trying to set up an experimental mesh network.
> I'm using two Linksys WRT54GS v4 routers with Freifunk 1.6.4 firmware.
> My aim is to connect to Node2 with my laptop (which has no OLSR) and
> reach the internet via Node1 (witch one is the internet gateway), so the
> network architecture is pretty simple: Laptop-->Node2-->Node1-->Internet.
> When this one works, I also would like to extend the network with new
> routers and clients (clients will not use OLSR).
> I've made the exact same settings described in this article:
> http://www.vdomck.org/2005/07/22/how-to-build-a-mesh-network-with-wrt54gs/
> The problem is, that the routers ain't communicate with each other (they
> sending out OLSR messages, but with strange message type values), they
> can't ping each other, and there's no entries at the OLSR table under
> the Status menu in the web interface.
> Can you tell me what else should I set up to get the network running?
> It would be also helpful if someone could send me a working network
> configuration (with a few details).
> Thanks in advance.
> David

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