Date: Thu, 21 Feb 2002 13:53:37 +0100 From: "Rogier R. Mulhuijzen" <drwilco@drwilco.net> To: Marcel de Vries <mdevries@haveityourway.nl>, Luigi Rizzo <rizzo@icir.org> Cc: freebsd-net@FreeBSD.ORG Subject: Re: network buffer problem -/- natd Message-ID: <5.1.0.14.0.20020221134511.044b1898@mail.drwilco.net> In-Reply-To: <5.1.0.14.2.20020219204129.00b5aa20@outshine> References: <20020219104432.A31233@iguana.icir.org> <5.1.0.14.2.20020219192110.01f45e48@outshine> <5.1.0.14.2.20020219154939.00bb52d8@outshine> <5.1.0.14.2.20020219192110.01f45e48@outshine>
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At 21:19 19-2-2002 +0100, Marcel de Vries wrote:
>I use mpd to setup a PPTP (gre encapsulation) connection between interface
>ep0 (public) and my Alcatel ADSL modem.
>Don't ask me why but it's the concept of a BIG telecom company we all love
>to hate in the Netherlands. KPN TELECOM.
>
>And most of the people use mpd in the Netherlands and find it a
>comfortable and more stable solution I think.
Yeah, I use it too.
>Well I guess mxstream ADSL works fine in most cases. These other paid OS
>types like w9x/me, winnt, win2k/XP all can handle PPTP VPN connections
>only with the correct DUN version for the early win versions that is. And
>almost every ordinary household who owns a computer is running one of the
>disgusting platforms mentioned above. And I think it have to work great in
>combination with ADSL or else they could flush there concept down the
>drains. Because mxstream wants to attract and provide internet for this sector.
>
>There where a lot problems in the beginning of mxstream but they changed
>there design to make it more useful for a internet user.
Such as using 10.0.0.0/8 and using NAT! =( Thanks to a few of the internet
providers that use MxStream to do ADSL that has been pushed out. (To show
you how messed up KPN is at times)
>So as most of the BSD community who are in lucky circumstances to own a
>ADSL connection would love to use FreeBSD as a router for the rest of the
>network.
>
>I know more people are dealing with packet loss and losing there
>connection in use with mxstream ADSL. People that really use there
>internet extensive that is ;-)
OK so I'm not the only one experiencing this from time to time.
I have not seen any bufferspace messages however, am I correct that you
don't get that anymore since switching to natd?
I haven't had too much time to find out what's going on, but from time to
time my connection seems to freeze up, and indeed when I look in top, natd
is eating a large chunk of the CPU time. But when I look in trafshow I see
something very strange. One connection has an enormous outbound rate. It
would be trying to push a few megabytes per second down the 256Kbit
upstream that I have (for other MxStream users, yes I have the Fast variant
and I'm loving it!). There must be some sort of loop somewhere that's
resending the same packet over and over again, as a lot of the times my
windows box will be the one responsible for the connection and it's not
pumping that data over my internal LAN.
Any natd/mpd/netgraph guru's have any hints about where to start
looking/how to debug this? If I'm not the only one having this problem I'd
like to get this out of the way ASAP.
Doc
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