Date: Wed, 13 Mar 2002 12:59:59 +1000 From: Greg Black <gjb@gbch.net> To: Brian Somers <brian@freebsd-services.com> Cc: "Matthew Emmerton" <matt@gsicomp.on.ca>, freebsd-net@FreeBSD.ORG Subject: Re: ppp -nat fails with adsl, but ok with modem Message-ID: <nospam-1015988399.86245@bambi.gbch.net> In-Reply-To: <200203071339.g27DdQH6073865@hak.lan.Awfulhak.org> of Thu, 07 Mar 2002 13:39:26 GMT References: <200203071339.g27DdQH6073865@hak.lan.Awfulhak.org>
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Brian Somers wrote: | > > "Matthew Emmerton" wrote: | > > | From: "Greg Black" <gjb@gbch.net> | > > | To: <net@FreeBSD.ORG> | > > | Sent: Friday, February 22, 2002 10:39 PM | > > | Subject: ppp -nat fails with adsl, but ok with modem | > > | | > > | > I've had ppp -nat working just fine over a normal modem link, | > > | > but it is not working at all well on my ADSL link to the same | > > | > provider. | > > | > | > > | > To quantify "not working at all well", although I can ping and | > > | > traceroute ok from the hosts on my LAN, HTTP and FTP traffic is | > > | > so slow and bursty as to be useless. Clicking on a link with | > > | > Netscape will see short bursts of data with long periods (of a | > > | > minute or more) where it says "stalled". | > > | > | > > | > Clicking on <http://www.freebsd.org/gnome/newsflash.html>; from | > > | > my gateway host gets the page in an eye-blink, but on the NAT | > > | > hosts, it will take 40 seconds to load the top banner and the | > > | > "FreeBSD GNOME News Flash" heading, then another delay of 40 or | > > | > so seconds before the rest of the page will be displayed. Even | > > | > then, Netscape thinks it has stalled and keeps waiting for the | > > | > last bit of data. | > > | > | > > | > With FTP, a small transfer (e.g., a directory listing of / on | > > | > ftp.freebsd.org) will complete normally; but something slightly | > > | > larger (e.g., a listing of /pub/FreeBSD on the same server), | > > | > will produce: | > > | > | > > | > ftp> cd /pub/FreeBSD | > > | > 250 CWD command successful. | > > | > ftp> dir | > > | > 200 PORT command successful. | > > | > 150 Opening ASCII mode data connection for '/bin/ls'. | > > | > ftp: netin: Connection reset by peer | > > | > 226 Transfer complete. | > > | > ftp> quit | > > | > 421 Timeout (60 seconds): closing control connection. | > > | > | > > | > If I do the same things from the host that is connected to the | > > | > modem(s), everything works fine, for both types of connections. | > > | > | > > | > I'm finding this very frustrating, and I'm wondering if there's | > > | > something weird about PPPoE with the ADSL link that needs some | > > | > special magic in order for things to work properly. | > > | > | > > | > If anybody can point me at the truth, I'd be most grateful. | > > | > | > > | > Alternatively, if anybody can suggest steps I could take to | > > | > identify the nature of the problem, that would also be most | > > | > welcome. | > > | > | > > | > Greg Black | > > | > | > > | What version of FreeBSD are you using? The ppp included in early 4.x | > > | distributions doesn't have the TCP MSS fixup code that is required to | > > | make | > > | things work properly with a PPPoE connection, and cause the kinds of | > > | symptoms that you describe. | > > | > > The NAT box is running 4.2-RELEASE -- is that a problem? | > | > Yes. This problem was first fixed in 4.2-STABLE. There are two safe ways to | > fix this: | > - upgrade to a newer -RELEASE or -STABLE | > - run the tcpmssd program (which is in the ports collection - | > /usr/ports/net/tcpmssd) | | - Install the latest version of ppp from http://www.Awfulahk.org/ppp.html OK, I'll grab it and give it a try. Will it be OK to install that on a 4.1-RELEASE box? Should I still use the following lines in my ppp.conf? set mru 1492 set mtu 1492 Thanks in advance, Greg To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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