Date: Thu, 10 Jan 2002 22:21:17 -0500 (EST) From: cmh@orange-carb.org (Colin Henein) To: freebsd-questions@freebsd.org Subject: Re: Q: ADSL connection hangs (not tcpmssfixup) Message-ID: <20020111032117.15395.qmail@mail.orange-carb.org>
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Hmmm... Seems like this question didn't see a lot of action. (Not that
I'm throwing any stones, mind you...)
Would I be better to post it to a tech list like freebsd-net?
Anyone care to take a shot in the dark before I do?
Colin
Forwarded message:
> From cmh Thu Jan 10 11:01:58 2002
> Subject: Q: ADSL connection hangs (not tcpmssfixup)
> To: freebsd-questions@freebsd.org
> Date: Thu, 10 Jan 2002 11:01:58 -0500 (EST)
> X-Mailer: ELM [version 2.5 PL3]
> Content-Length: 3457
>
> Greetings all question answering types.
>
> I have a question for you regarding some very strange TCP behaviour
> I've noticed over the last little while.
>
> I am on ADSL service (magma.ca), and the FreeBSD box is connected
> directly to my Nortel 1meg modem. I have an "inside" network as well,
> which pretty much only sends and receives web traffic. I have no ports
> that open through onto the inside network, so all incoming connection
> requests terminate on the FreeBSD box itself.
>
> I have the classic ADSL problem of not being able to get replies back
> from certain websites (whether using lynx on the FreeBSD box, or IE on
> my powerbook). I also am running an SMTP server (qmail) and have
> trouble receiving emails from certain sites.
>
> If I remove the FreeBSD box from the loop and plug my powerbook
> straight into the 1meg modem then I can hit all the websites that I
> can't hit when I'm routing through FreeBSD. This makes me suspect
> either my configuration of FreeBSD (more likely) or the OS itself
> (less likely).
>
> I understand the black hole router problem, but an upgrade to
> release-4.4 with the default tcpmssfixup option on ppp doesn't solve
> the problem. Here is my ppp.conf file:
> |magma:
> | set redial 30.120 0
> | set reconnect 120 9999999
> | set device PPPoE:ed1
> | set MRU 1492
> | set MTU 1492
> | set authname #########
> | set authkey #########
> | set log Phase
> | set dial
> | set login
> | set ifaddr 64.26.169.169 10.0.0.2/0 255.255.255.255
> | set timeout 0
> | set cd 5
> | enable lqr
> | set lqrperiod 10
> | set crtscts off
>
> The www problem I can get around with proxies, but the SMTP problems
> are more serious. I am dropping emails from a few hosts on the floor,
> and a few specific mailing list subscribers are having serious
> problems. What happens is that inbound SMTP connections hang after my
> FreeBSD box sends the 'go ahead to send data' response. Here is a
> captured dialog between my mail server (mail.orange-carb.org) and one
> of the problematic senders (tomts9-srv.bellnexxia.net):
> > 220 mail.orange-carb.org ESMTP^M
> < EHLO tomts9-srv.bellnexxia.net^M
> > 250-mail.orange-carb.org^M
> > 250-PIPELINING^M
> > 250 8BITMIME^M
> < MAIL FROM:<normand.levert@sympatico.ca>^M
> > 250 ok^M
> < RCPT TO:<members@hotrak.ca>^M
> > 250 ok^M
> < DATA^M
> > 354 go ahead^M
> > 451 timeout (#4.4.2)^M
> > [EOF]
>
> As those familiar with Canadian networks might expect, my attempts to
> contact anyone technical at bellnexxia's NOC, or sympatico's IS people
> have been met with resounding silence.
>
> I desparately need a solution to this that I can implement
> myself. Even my own ISP will be hard to convince since they explicitly
> will not support anything that isn't Mac/Windows/Linux.
>
> Is this question too specific and low-level for this forum? I can try
> to find one of the tech fora to post in, but I'm not sure of the
> netiquette on this issue...
>
> Colin
>
> p.s. I should mention up front that I've been using FreeBSD for many
> years now, and have a solid understanding of TCP. So if you think you
> can help, don't hold back the technical details on my account...
>
>
>
> Colin
>
> --
> || when we're little kids maybe we need stories
> Colin Henein || to help us go to sleep. but sooner or later we
> || need stories to help us wake up... -- Utah Phillips
>
>
Colin
--
|| when we're little kids maybe we need stories
Colin Henein || to help us go to sleep. but sooner or later we
|| need stories to help us wake up... -- Utah Phillips
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