Date: Wed, 13 Mar 2002 09:48:42 +0000 From: Brian Somers <brian@freebsd-services.com> To: Greg Black <gjb@gbch.net> Cc: Brian Somers <brian@freebsd-services.com>, "Matthew Emmerton" <matt@gsicomp.on.ca>, freebsd-net@FreeBSD.ORG, brian@freebsd-services.com Subject: Re: ppp -nat fails with adsl, but ok with modem Message-ID: <200203130948.g2D9mgGd003975@hak.lan.Awfulhak.org> In-Reply-To: Message from Greg Black <gjb@gbch.net> of "Wed, 13 Mar 2002 12:59:59 %2B1000." <nospam-1015988399.86245@bambi.gbch.net>
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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 be. > Should I still use the following lines in my ppp.conf? > > set mru 1492 > set mtu 1492 These shouldn't be required any more. > Thanks in advance, > > Greg -- Brian <brian@freebsd-services.com> <brian@Awfulhak.org> http://www.freebsd-services.com/ <brian@[uk.]FreeBSD.org> Don't _EVER_ lose your sense of humour ! <brian@[uk.]OpenBSD.org> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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