Date: Sun, 24 Feb 2002 15:26:46 -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: <00ad01c1bd71$98237820$1200a8c0@gsicomp.on.ca> References: <nospam-1014435560.48368@bambi.gbch.net>
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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. Matt ----- Original Message ----- 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 > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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