Date: 26 Dec 2002 12:37:05 +0000 From: Stacey Roberts <stacey@vickiandstacey.com> To: Rostislav Krasny <rosti_bsd@yahoo.com> Cc: freebsd-net@freebsd.org, FreeBSD Questions <freebsd-questions@FreeBSD.ORG> Subject: Re: PPPoE and troubles with TCP Message-ID: <1040906224.68500.38.camel@localhost> In-Reply-To: <20021226122624.79372.qmail@web14812.mail.yahoo.com> References: <20021226122624.79372.qmail@web14812.mail.yahoo.com>
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On Thu, 2002-12-26 at 12:26, Rostislav Krasny wrote: > Hello > > I have Alcatel Speedtouch Home ADSL modem. I use PPPoE protocol for > connection with my Internet Service Provider (ISP) through this ADSL > modem. I use FreeBSD 4.7-RELEASE and ppp (a.k.a. user-ppp) for this. In > the /etc/ppp/ppp.conf file I have ' set MRU 1492' and ' set MTU 1492' > options. This is because the maximum MTU one can use with PPPoE is 1492 > according to RFC 2516. I have no problems with "dialing" to my ISP. But > after the PPPoE connection is established I have troubles with TCP > connections to some hosts. For example I can't go to > hhtp://www.ssh.com/ but to http://www.freebsd.org/ or > http://www.gnu.org/ I can. If I run 'telnet www.ssh.com 80' and enter > HTTP request according to HTTP 1.1 or 1.0 protocol I don't get any > answer. If I enter just 'GET /' I get some short answer. 'GET /' is an > HTTP request according to the old HTTP 0.9 version of the protocol and > it is rarely used today. But the problem is not HTTP, I think. If I do > HTTP request according to HTTP 1.1 from my friends' computer I do have > some long answer. Furthermore if I change the MRU and MTU to 1484 or > smaller I have no problem with www.ssh.com. So it looks like TCP packet > overflow or something like that. > Besides FreeBSD I have Windows 98 Second Edition in my computer. I use > PPPoE with Win98SE too. I use RASPPPOE driver fo it, go to > http://www.raspppoe.com/ for more information. I have no problems with > www.ssh.com when I use Win98SE with this impimentation of PPPoE > protocol. I have MTU == 1492 set by default in RASPPPOE. I don't get > error messages about fragmentation when I run 'ping -f -l 1464 > www.ssh.com' in my Win98SE (ICMP+IP=1464+28=1492). Why in FreeBSD I > cannot use MTU == 1492 without problems with some hosts like > www.ssh.com ? How to fix it in FreeBSD? > > P.S. ping have different syntax in Windows, so don't be wondered about > -f flag. -f sets "no fragmentation" flag in IP headers of all outgoing packets. > I use ADSL here on my site, but not that modem. How do you connect to that device from the FBSD box? Regards, Stacey > __________________________________________________ > Do you Yahoo!? > Yahoo! Mail Plus - Powerful. Affordable. Sign up now. > http://mailplus.yahoo.com > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message -- Stacey Roberts B.Sc (HONS) Computer Science Web: www.vickiandstacey.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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