dear users,
we use vtun 3.0.2 on openWRT to reduce airtime-usage
between wireless links. So we have enabled UDP/tun tunnels
with lzo:9 and shaping. everything is working fine.
what is not written on documentation: if lzo compresses good
and we have enabled shaping, than the user behind the tunnel gets
a higher bandwidth than exspected. so the shaping works not before
the data goes into the tunnel. (means: on the inner side, but not on
the outer side). So if the tunneled user downloads a textfile but is shaped
to 50K, than he can exspect to download with 200K. It's not a problem,
just want to mention this, haven't found an answer on this, till i just tried
it.
In the manpages is a MTU of 1450 for UDP/tun proposed - why?
Is'nt it just an ipip-tunnel with an UDP-header?
Meaning 20 bytes IP-header and 8 bytes UDP-header? so if our
wireless link has an MTU of 1500, wo can stick the tunnel to
1500 - 20 - 8 = 1472 bytes MTU?
I have read something about header compression, there was a patch
on a mailinglist. Is it already included? if yes, how does it change the
MTU problem?
Another thing to mention:
if a program in the up or down-section fails, we don't see this in the logs,
so we have to care for ourselfs. maybe a sentence worth in the doc.
Another thing:
what is the best thing to get the PID of a specific tunnel? (for sending a
SIGHUP)
whould'nt it be good to have a placeholder in the up-section to
have the chance to write it to a file? something like "%pid" or "%i"?
this is too hackish and not fast:
line="$( ps ax | fgrep "vtund[c]: ${tunnel_name} connecting to" | fgrep -v
"fgrep" | head -n1 )"
set $line
pid="$1"
Another thing:
i propose a pre-up section. because we dynamically create the config-files,
and there es an error, we have no chance to make an (automatic) change,
before the daemon tries to establish the connection.
our workaround is, to regulary check all established conns and rewrite some
rules, if some conns are missing...
bye, Bastian
------------------------------------------------------------------------------
Get a FREE DOWNLOAD! and learn more about uberSVN rich system,
user administration capabilities and model configuration. Take
the hassle out of deploying and managing Subversion and the
tools developers use with it.
http://p.sf.net/sfu/wandisco-dev2dev
_______________________________________________
Vtun-Users mailing list
Vtun-Users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/vtun-users
