4 Aug
2007
4 Aug
'07
9:43 a.m.
Hello!
On Freitag 03 August 2007, Freifunk Dresden wrote:
Do you really think of a human-readable ascii string that you want to flood
with an arbitrary length over the mesh with content like: "Hello take a cool
beer and see my fancy cool movie torrent-server at 105.10.bla.bub". Iam not
against such communication but...
default OGM size: 10 bytes
OGM + HNA size: 15 bytes
OGM + example-TLV-ascii message: 95 bytes
... I am a bit scared about the amount of data which would be flooded over the
mesh (at every originator interval) with no means for stopping the sources.
Therefore i asked if anybody knows a decent forman for describing such
services (preferably in a short and machine readable notation).
Perhaps another approach is to just have a kind of key-to-service list
(similar to /etc/services with a 16bit key) just roughly indicating the type
of offered service together with another port/ip where further information
(of arbitrary length) about the indicated service can be retrieved.
This would also allow to outsource part of the service-discovery to another
daemon.
greetings,
axel
Hello,
I didn't get the email for this request, so the mailling list thread
my be brocken.
strange, anybody else experienced problems?
[...]
> > I'm currently checking how the HNA is
working, but until now I can not
[...]
I have checked out the rv491 and it seems working. In
my test environment I
use a laptop (i386) and two wrt54gl. The wrt shows at "-d3" that the
announced HNA is added/deleted every 1-5 seconds. The wrt that has a
greater distance (5meter 2 walls between) adds and deletes the HNA in a
highe frequency than the
wrt that is about 50cm away.
I think that HNA should not be deleted to fast because someone that is
using this "bad" connection will get often error messages during
surfing that the rout e is not found. It would be better if just the
connection slow because of transmistion errors.
that should not be the case! You say even with the stable connection to your
near-by WRT that the HNA is added/deleted every 1 - 5 SECONDS ! And even more
often at the distant WRT (so added/deleted every SECOND ?).
Can you describe the setup and parametrization in more detail?
[...]
I have looked through the code and have seen that the HNA is simply
appended to
the end of a message. if we want to send other information a TLV structure
is needed (Tag-length-value). Batmand can ignore unknown Tags and is
still working in the network. At moment the whole network needs an
update at same time, because old batmand will interpret any data as HNA.
I hope I'm not wrong :) Another Idea of the "-m" is to
differenciate this parameter to -M
<"message"> and -m <send-script>. by calling batmand -c -m
send-script,
batmand can setup stdin/stdou as binary file handle and fill a user-OGM
with binary data that is then send.
Even if such message-flooding ist not implemented I just thought of
whether there exist some standardized formats to announce such
services (maybe the community network markup language CNML idea) ?
ciao, axel