Date: Mon, 25 Feb 2002 10:20:05 +1000 From: Greg Black <gjb@gbch.net> To: "Matthew Emmerton" <matt@gsicomp.on.ca> Cc: freebsd-net@freebsd.org Subject: Re: ppp -nat fails with adsl, but ok with modem Message-ID: <nospam-1014596405.52209@bambi.gbch.net> In-Reply-To: <001e01c1bd8a$22f347b0$1200a8c0@gsicomp.on.ca> of Sun, 24 Feb 2002 18:22:27 EST References: <nospam-1014435560.48368@bambi.gbch.net> <00ad01c1bd71$98237820$1200a8c0@gsicomp.on.ca> <nospam-1014584347.44641@bambi.gbch.net> <001e01c1bd8a$22f347b0$1200a8c0@gsicomp.on.ca>
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"Matthew Emmerton" wrote: | > | > 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. | > | | > | 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) I'll try tcpmssd first -- I have some other systems in a similar situation that are running 4.1-RELEASE and can't be upgraded, so my solution needs to work for them too. Thanks for the information. Greg To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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