RE: Help needed: cannot send packets larger 230 bytes via vodafone umts

-----Original Message-----
From: Andrew Gordon [mailto:[email protected]] 
Sent: Tuesday, October 11, 2005 2:55 PM
To: Rehsack Jens (ext)
Cc: [email protected]
Subject: RE: Help needed: cannot send packets larger 230 bytes via
vodafone umts

> On Tue, 11 Oct 2005, Rehsack Jens (ext) wrote:
> > > >
> > > > So I figured out how to configure ppp (it's not trivial! ;-))
and
> > > > after around 5 or 6 hours I get it run that way, that nslookup
> > > > & ping works ...
> 
> Your ppp.conf looks a bit more complex than needed, but on the other
hand
> doesn't seem to contain the "AT_opsys=3,2" to request UMTS (versus
GPRS).
> Maybe your card defaults to UMTS.

My cards answers with "ERROR" to the at_opsys command.

> Mine looks like:

[SNIP]

I seen in the logs and tried even - wont work for me.

> Note that this is for the Vodafone-branded 'Option' cardbus card,
which
> contains a USB controller and a USB serial port (as discussed on this
> mailing list a week or so ago).  I use the '2g' entry in ppp.conf to
avoid
> roaming onto 3G networks which have voice interworking with Vodafone
but
> not data (this may not be as much a problem now as it was last year,
but
> in any case with roaming charges so high, slowing down to GPRS rates
when
> roaming is no bad thing).

Hmm - when I get in run, I'll think about roaming ;)
Anyway I will keep in mind - thanks for that explanation.

> > And horribly I had to see, that traceroute seems to transport even
> > larger packets an get's the wanted answers. I also tried after that
> > shock >traceroute -P TCP< and seen, that it works, too.
> >
> > But an >echo "GET /
> > " | telnet www.uni-halle.de 80< didn't get any answer (keeps empty).
> 
> I'm fairly sure that Vodafone have a transparent proxy on port 80.  It
> used to be a specialised one that replaced graphics files in web pages
> with more-heavily-compressed versions of the original file, though
that
> might be only when using GPRS rather than 3G.
> 
> Did you try something like ssh?

Yes, I tried. I even tried IRC. It's the same :-(

> Note also that Vodafone are certainly doing NAT.

That shouldn't bother me. As long as they do it fine ;)

> [All the above based on Vodafone UK behaviour, and roaming to various
> places; I've not actually tried it in Germany].

The problem is, that vodafone wont give support for anything
except windows and macosx.

So finally I'm nearly helpless with this situation :/

Best regards,
Jens
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