Date: Tue, 9 Sep 2003 10:17:31 +0100 From: "Dan Hardiker" <dhardiker@eorigen.com> To: "Michael Bretterklieber" <mbretter@a-quadrat.at> Cc: freebsd-net@freebsd.org Subject: Re: MPD Issues - Errors and Mysterious Packet Loss Message-ID: <008e01c376b3$32944ff0$3601a8c0@ws4> References: <024601c37607$7de4ef70$3601a8c0@ws4><Pine.WNT.4.56.0309091021040.3872@BRUTUS> <005b01c376af$c60693a0$3601a8c0@ws4>
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> [Dan Hardiker] > I have since managed to find (on the source forge mpd mailing list not > mentioned on the mpd homepages) someone else with an identical problem (who > was advised to install a TCP-MSS patch). It appears that the problem lies > with XP connected to MPD using a VPN. Actually on reflection - it was you > who suggested it! > > For reference: > http://sourceforge.net/mailarchive/forum.php?thread_id=3083368&forum_id=32902 The patch was faulty - a number of hunks failed (all down to incorrect line numbers) ... and in any case, the patch doesnt appear to work. Same problem exactly. I did, however, run TCP dump and found that all pings I sent got a reply ... but only 30% of them made it back to the client [10:09:13][root@armadillo]:~$ tcpdump -i ng0 tcpdump: listening on ng0 10:09:20.164094 192.168.1.101 > 192.168.1.3: icmp: echo request 10:09:20.164111 192.168.1.3 > 192.168.1.101: icmp: echo reply 10:09:21.165665 192.168.1.101 > 192.168.1.3: icmp: echo request 10:09:21.165682 192.168.1.3 > 192.168.1.101: icmp: echo reply 10:09:26.173258 192.168.1.101 > 192.168.1.3: icmp: echo request 10:09:26.173276 192.168.1.3 > 192.168.1.101: icmp: echo reply 10:09:31.180864 192.168.1.101 > 192.168.1.3: icmp: echo request 10:09:31.180882 192.168.1.3 > 192.168.1.101: icmp: echo reply etc This is what I get when listening to the public interface: I have replaced the public ip of the xp box with $XP$ and the public ip of the mpd server with $MPD$ to protect their identities on the lists. 10:13:05.507078 $XP$.dsl.in-addr.zen.co.uk > $MPD$.dsl.in-addr.zen.co.uk: gre [KSv1] ID:d4d6 S:149 ppp: 10:13:05.507233 $MPD$.dsl.in-addr.zen.co.uk > $XP$.dsl.in-addr.zen.co.uk: gre [KSAv1] ID:c000 S:74 A:149 ppp: 10:13:06.508585 $XP$.dsl.in-addr.zen.co.uk > $MPD$.dsl.in-addr.zen.co.uk: gre [KSv1] ID:d4d6 S:150 ppp: 10:13:07.007718 $MPD$.dsl.in-addr.zen.co.uk > $XP$.dsl.in-addr.zen.co.uk: gre [KAv1] ID:c000 A:150 [|gre] 10:13:07.438692 $MPD$.dsl.in-addr.zen.co.uk.pptp > $XP$.dsl.in-addr.zen.co.uk.3015: P 3213034689:3213034705(16) ack 781309220 win 58400: pptp CTRL_MSGTYPE=ECHORQ ID(5) (DF) 10:13:07.439050 $XP$.dsl.in-addr.zen.co.uk.3015 > $MPD$.dsl.in-addr.zen.co.uk.pptp: P 1:21(20) ack 16 win 63952: pptp CTRL_MSGTYPE=ECHORP ID(5) RESULT_CODE(1) ERR_CODE(0) (DF) 10:13:07.538639 $MPD$.dsl.in-addr.zen.co.uk.pptp > $XP$.dsl.in-addr.zen.co.uk.3015: . ack 21 win 58400 (DF) 10:13:11.516195 $XP$.dsl.in-addr.zen.co.uk > $MPD$.dsl.in-addr.zen.co.uk: gre [KSv1] ID:d4d6 S:151 ppp: 10:13:12.015955 $MPD$.dsl.in-addr.zen.co.uk > $XP$.dsl.in-addr.zen.co.uk: gre [KAv1] ID:c000 A:151 [|gre] 10:13:16.523867 $XP$.dsl.in-addr.zen.co.uk > $MPD$.dsl.in-addr.zen.co.uk: gre [KSv1] ID:d4d6 S:152 ppp: 10:13:16.524018 $MPD$.dsl.in-addr.zen.co.uk > $XP$.dsl.in-addr.zen.co.uk: gre [KSAv1] ID:c000 S:75 A:152 ppp: 10:13:17.525379 $XP$.dsl.in-addr.zen.co.uk > $MPD$.dsl.in-addr.zen.co.uk: gre [KSv1] ID:d4d6 S:153 ppp: 10:13:18.025044 $MPD$.dsl.in-addr.zen.co.uk > $XP$.dsl.in-addr.zen.co.uk: gre [KAv1] ID:c000 A:153 [|gre] 10:13:22.533079 $XP$.dsl.in-addr.zen.co.uk > $MPD$.dsl.in-addr.zen.co.uk: gre [KSv1] ID:d4d6 S:154 ppp: 10:13:23.032273 $MPD$.dsl.in-addr.zen.co.uk > $XP$.dsl.in-addr.zen.co.uk: gre [KAv1] ID:c000 A:154 [|gre] 10:13:27.540633 $XP$.dsl.in-addr.zen.co.uk > $MPD$.dsl.in-addr.zen.co.uk: gre [KSv1] ID:d4d6 S:155 ppp: 10:13:27.540786 $MPD$.dsl.in-addr.zen.co.uk > $XP$.dsl.in-addr.zen.co.uk: gre [KSAv1] ID:c000 S:76 A:155 ppp: 10:13:28.542216 $XP$.dsl.in-addr.zen.co.uk > $MPD$.dsl.in-addr.zen.co.uk: gre [KSv1] ID:d4d6 S:156 ppp: 10:13:29.041353 $MPD$.dsl.in-addr.zen.co.uk > $XP$.dsl.in-addr.zen.co.uk: gre [KAv1] ID:c000 A:156 [|gre] Notice the pptp ECHORQ ID(5) ... maybe that can help us in some way? Thanks for any help you can give. -- Dan Hardiker [dhardiker@eorigen.com] ADAM Systems Engineer eOrigen Ltd
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