Date: Mon, 11 Feb 2002 02:47:07 -0500 From: "jack xiao" <jack_xiao99@hotmail.com> To: <freebsd-isp@FreeBSD.ORG>, <freebsd-net@freebsd.org> Subject: MTU problems on PPP interfaces with L2TP Message-ID: <OE62ZS2TRqf69aZbLAX000144c5@hotmail.com>
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This is a multi-part message in MIME format. ------=_NextPart_000_0080_01C1B2A6.654328E0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0081_01C1B2A6.654328E0" ------=_NextPart_001_0081_01C1B2A6.654328E0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 DQo= ------=_NextPart_001_0081_01C1B2A6.654328E0 Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: base64 PCFET0NUWVBFIEhUTUwgUFVCTElDICItLy9XM0MvL0RURCBIVE1MIDQuMCBUcmFuc2l0aW9uYWwv L0VOIj4NCjxIVE1MPjxIRUFEPg0KPE1FVEEgaHR0cC1lcXVpdj1Db250ZW50LVR5cGUgY29udGVu dD0idGV4dC9odG1sOyBjaGFyc2V0PWdiMjMxMiI+DQo8TUVUQSBjb250ZW50PSJNU0hUTUwgNi4w MC4yNjAwLjAiIG5hbWU9R0VORVJBVE9SPg0KPFNUWUxFPjwvU1RZTEU+DQo8L0hFQUQ+DQo8Qk9E WSBiZ0NvbG9yPSNmZmZmZmY+DQo8RElWPjxGT05UIGZhY2U9QXJpYWwgc2l6ZT0yPjwvRk9OVD4m bmJzcDs8L0RJVj48L0JPRFk+PC9IVE1MPg0K ------=_NextPart_001_0081_01C1B2A6.654328E0-- ------=_NextPart_000_0080_01C1B2A6.654328E0 Content-Type: text/plain; name="mtu problems on pppd interfaces with l2tp.txt" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="mtu problems on pppd interfaces with l2tp.txt" I set up L2TP tunnels between FreeBSD4.2 and Redback through VLAN = interfaces. Then ADSL clients connect to our FreeBSD server through PPP tunnel = directly.=20 Actually, the PPPd is caused by L2tpd = (http://sourceforge.net/projects/l2tpd/) to=20 genarate a PPP tunnel. Now I met some weird problems about the MTU value on PPP interfaces. Here is the values I set for all the interfaces, Ethernet:1500 Vlan:1496 PPP:1496-16(L2tp header)-20(ip-ip tunnel header)-4(ppp header)=3D1456 So I set mtu 1456 and mru 1456 for ppp interfaces I am not sure it is the right value. Any suggestion? On the PPPoE client the default value is 1492 for mru and 1454 for mtu. During the test, I found I can hit websites but can't download files = from some websites. So I droped the PPP mtu and mru to 1452 and I can download but can't hit = some websites. Does anybody have such experience as above? Any help will be = appreciated. Thanks! Jack ------=_NextPart_000_0080_01C1B2A6.654328E0-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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