Date: Sun, 24 Feb 2002 18:22:27 -0500 From: "Matthew Emmerton" <matt@gsicomp.on.ca> To: "Greg Black" <gjb@gbch.net> Cc: <freebsd-net@freebsd.org> Subject: Re: ppp -nat fails with adsl, but ok with modem Message-ID: <001e01c1bd8a$22f347b0$1200a8c0@gsicomp.on.ca> References: <nospam-1014435560.48368@bambi.gbch.net> <00ad01c1bd71$98237820$1200a8c0@gsicomp.on.ca> <nospam-1014584347.44641@bambi.gbch.net>
next in thread | previous in thread | raw e-mail | index | archive | help
> "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 > | > > | > To Unsubscribe: send mail to majordomo@FreeBSD.org > | > with "unsubscribe freebsd-net" in the body of the message > | > | 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) -- Matt Emmerton To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?001e01c1bd8a$22f347b0$1200a8c0>