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Date:      Sun, 29 Dec 2002 02:52:17 -0800 (PST)
From:      Rostislav Krasny <rosti_bsd@yahoo.com>
To:        Eli Dart <dart@nersc.gov>
Cc:        freeBSD-net@freebsd.org
Subject:   Re: PPPoE and troubles with TCP 
Message-ID:  <20021229105217.13130.qmail@web14802.mail.yahoo.com>

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[-- Attachment #1 --]
I have some sniffer in Win98SE but don't know how to save its dump in
the text format to make it easy to read. So I maked a screenshot of the
first TCP/IP packet with HTTP response I got from www.ssh.com in my
Win98SE. Look at ssw_com.png file in the attachments. Draw your
attention to the "Total length" and to the "Flags" in the IP header.

--- Rostislav Krasny <rosti_bsd@yahoo.com> wrote:
> To produce these tcpdump's log files I used two terminals. In the
> first
> I ran 'tcpdump -n > filename' and in the second I ran 'links URL'. I
> ran the first command before the second one, of course. In case of
> www.ssh.com the "links" browsers maked TCP connection, sent HTTP
> request and the last thing it got from www.ssh.com was ACK packet,
> nothing more. I waited few seconds and pressed to the 'q' key so
> "links" will quit. That is why you see FIN packet sent from my host.
> If
> I stop "tcpdump" before "links" quiting there is no FIN packet in the
> log file of "tcpdump". Look at 1492-2.log and 1492-3.log new files.
> In
> case of the 1492-2.log file I just stoped tcpdump before quiting
> "links". In case of the 1492-3.log file I stoped tcpdump after
> quiting
> links but I waited more time. So you can see few PPPoE echo requests
> and responses before the FIN. That is the time I was waiting before I
> closed the "links" browser.
> I use links because it is a text mode browser, so I will not download
> images that can flood tcpdump's logs. But the problem with
> www.ssh.com
> exists when I use any browser or even simulate it by sending HTTP/1.1
> or HTTP/1.0 "GET" request manually through 'telnet www.ssh.com 80'.
> If
> I send just "GET /<newline>" (it is HTTP/0.9 request) I get some
> short
> response about that document was moved. HTTP/0.9 is not in use today
> by
> most web sites (including www.ssh.com) and browsers.
> Look at 1492-fbsd.org.log file, there is the log of successful HTTP
> connection with www.freebsd.org when MTU==MRU==1492.
> 
> Of course I can use smaller MTU and MRU (<=1484) but when I use
> Win98SE
> with RASPPPOE driver I have no troubles when MTU == 1492. Why in
> FreeBSD it is impossibly? If FreeBSD or its ppp have some bug why not
> to fix it instead? And it looks like a bug.
> 
> --- Eli Dart <dart@nersc.gov> wrote:
> > Well, I noticed one thing from the tcpdump files -- in the 1492
> case,
> > 
> > your machine is sending a FIN to www.ssh.com.  In the 1484 case, of
> 
> > course no FIN is sent.  However, if you look at the 1492 tcpdump
> > you'll 
> > see connection establishment, a packet sent to www.ssh.com (an http
> 
> > request I assume), a retransmit of that packet a second later 
> > (implying that the first did not arrive), an ack for that packet
> from
> > 
> > www.ssh.com, and a fin from your box, which is then acknowledged.
> > 
> > I don't know what's causing it, but it appears that the application
> 
> > you're using is seeing something it doesn't like, and is closing
> its 
> > socket.  I don't know why the www.ssh.com side does not send its
> own 
> > FIN -- it should (it may also not be getting to you).
> > 
> > I would look at a tcpdump of a successful connection to 
> > www.freebsd.org with the 1492 config (you said in an earlier post 
> > that this works).  You could also run with a slightly smaller MTU
> and
> > 
> > declare victory :)
> > 
> > 		--eli
> > 
> > 
> > 
> > In reply to Rostislav Krasny <rosti_bsd@yahoo.com> :
> > 
> > > 
> > > --0-2081754345-1041105297=:86278
> > > Content-Type: text/plain; charset=us-ascii
> > > Content-Disposition: inline
> > > 
> > > --- Eli Dart <dart@nersc.gov> wrote:
> > > > 
> > > > In reply to Rostislav Krasny <rosti_bsd@yahoo.com> :
> > > > 
> > > > > Thank you for your trying to help me. Your version of
> ppp.conf
> > is very
> > > > > similar to mine. I don't have LAN here, but only one box with
> > FreeBSD
> > > > > connected to the outside world through my ADSL modem. So '
> set
> > nat' and
> > > > > ' set proxy' options are not required in my case. I don't use
> > > > > ' set ifaddr' option because default arguments of it are good
> > for me.
> > > > > 
> > > > > I think that the source of my problem isn't in ppp.conf
> > probably,
> > > > > but somewhere in TCP. Nobody answered me how MTU == MRU ==
> 1484
> > solves
> > > > > my problem. Maybe there is a bug in TCP when MTU and MRU have
> > some
> > > > > unstandard value. When I use Win98SE in the same box and the
> > same ADSL
> > > > > modem with RASPPPOE driver of PPPoE I have no troubles when
> the
> > MTU is
> > > > > 1492 there. This is why I think the source of the problem is
> in
> > TCP
> > > > > implementation of FreeBSD. ppp have some dial with TCP, so
> > maybe the
> > > > > source of the problem is there but most likely not in
> ppp.conf
> > > > 
> > > > Are you blocking ICMP for "security reasons?"  If so, you can't
> > do 
> > > > path mtu discovery, and tcp will break if it needs a smaller
> mtu 
> > > > (which it appears that you do).
> > > 
> > > No, I'm not blocking ICMP. I have recently installed FreeBSD
> > 4.7-RELEASE
> > > with custom kernel that is a little simplified version of
> GENERIC.
> > There
> > > is no firewall enabled, yet. Look at CUST01 file in the
> > attachments, this
> > > is the configuration of the kernel of my system. I also ran
> > `tcpdump -n`
> > > and saved its output when I ran `links www.ssh.com` in other
> > terminal.
> > > I did it two times, the first when MRU == MTU == 1492 and the
> > second when
> > > it was 1484. Look at 1492.log and 1484.log files in the
> > attachments.
> > > 
> > > P.S. If one blocks ICMP why he have troubles when MTU == MRU ==
> > 1492 but
> > > don't have the troubles when MTU == MRU == 1484 ?
> 
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> ATTACHMENT part 2 application/octet-stream name=1492-2.log


> ATTACHMENT part 3 application/octet-stream name=1492-3.log


> ATTACHMENT part 4 application/octet-stream name=1492-fbsd.org.log



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[-- Attachment #2 --]
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