Date: Thu, 26 Dec 2002 05:16:45 -0800 (PST) From: Rostislav Krasny <rosti_bsd@yahoo.com> To: stacey@vickiandstacey.com Cc: freebsd-net@freebsd.org, FreeBSD Questions <freebsd-questions@FreeBSD.ORG> Subject: Re: PPPoE and troubles with TCP Message-ID: <20021226131645.94065.qmail@web14811.mail.yahoo.com> In-Reply-To: <1040906224.68500.38.camel@localhost>
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--- Stacey Roberts <stacey@vickiandstacey.com> wrote: > 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? I configured my ADSL modem to work with PPPoE. Then I changed the /etc/ppp/ppp.conf file to this one: ==== /etc/ppp/ppp.conf ==== default: set log Phase Chat LCP IPCP CCP tun command ident user-ppp VERSION (built COMPILATIONDATE) set device PPPoE:ed0 set speed sync # set MRU 1484 # set MTU 1484 set MRU maximum 1492 set MTU maximum 1492 set timeout 0 set urgent none # no priorities enable dns # request DNS info (for resolv.conf) disable ipv6 ipv6cp disable shortseq protocomp acfcomp vjcomp deflate pred1 mppe deny shortseq protocomp acfcomp vjcomp deflate pred1 mppe myisp: set authname username@ISPstring set authkey password add default HISADDR # Add a (sticky) default route ==== /etc/ppp/ppp.conf ==== The hostname of my box can be resolved through /ets/hosts , so I don't need any kind of 'set ifaddr' in /etc/ppp/ppp.conf file. ed0 is the ethernet NIC my ADSL modem is connected to. Many lines of the "default:" section of the ppp.conf file are not critical. The only ones you need are these: set device PPPoE:ed0 set MRU maximum 1492 set MTU maximum 1492 enable dns See `man 8 ppp` for more information. __________________________________________________ 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-net" in the body of the message
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