Re: MPD Issues - Errors and Mysterious Packet Loss

From: Dan Hardiker (dhardiker_at_eorigen.com)
Date: 09/09/03

  • Next message: Michael Bretterklieber: "Re: MPD Issues - Errors and Mysterious Packet Loss" 
    To: "Michael Bretterklieber" <mbretter@a-quadrat.at>
Date: Tue, 9 Sep 2003 09:53:00 +0100

    > > [Dan Hardiker]
    > > When I connect to the VPN I get a connection status box in my XP sys
    tray.
    > > If I open that up I get a list of bytes sent and received, as well as
    the
    > > compression % and number of errors. Compression is always 0% even
    through I
    > > tell mpd to use compression and have checked its enabled in the VPN
    > > connection settings.

    > [Michael Bretterklieber]
    > MPD (netgraph) doesen't support compression, because it's proprietary and
    > patentet, if you realy wan't to have compression (=STAC Compression) then
    > you have to buy the sources from www.hifn.com, but usualy you don't need
    > compression.

    Not having compression is perfectly fine - I was unsure if this was
    symtematic of my problem, but its not.

    > > If I sit the machine pinging the LAN IP of the MPD server when connected
    to
    > > the VPN, I start racking up lots of errors. Ive only been pinging for 15
    > > mins and the errors is up to 58. Unfortunatly it doesnt tell me WHAT
    those
    > > errors are, or where to start looking to resolve them.
    > >
    > > The short of it is that the VPN works, but its paralysingly slow
    (throughput
    > > has been logged via trafshow as being 300 bytes > 3k a sec on a 256kbit
    ADSL
    > > upstream ... averaging mostly around 300-400 bps) and could really do
    with
    > > some pointers as to where to start looking.

    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

    > can you please post you configuration and mpd's logfile?

    [MPD.CONF]
    #
    # Default configuration is "myisp"
    #

    default:
    # log +ccp +ccp2 +ccp3 +chat2 +echo +frame +mp +mp2 +pptp2 +pptp3
            load zen

    # Net Connection A
    zen:
            load pptpClient0
            load pptpClient1
            load pptpClient2
            load pptpClient3
            load pptpClient4

    # Net Connection B
    demon:
            load pptpClient5
            load pptpClient6
            load pptpClient7
            load pptpClient8
            load pptpClient9

    #
    # Mpd as a PPTP server compatible with Microsoft Dial-Up Networking clients.
    #

    pptpClient0:
            new -i ng0 pptp0 pptp0
            set ipcp ranges 192.168.1.3/24 192.168.1.101/24
            load pptp

    pptpClient1:
            new -i ng1 pptp1 pptp1
            set ipcp ranges 192.168.1.3/24 192.168.1.102/24
            load pptp

    pptpClient2:
            new -i ng2 pptp2 pptp2
            set ipcp ranges 192.168.1.3/24 192.168.1.103/24
            load pptp

    pptpClient3:
            new -i ng3 pptp3 pptp3
            set ipcp ranges 192.168.1.3/24 192.168.1.104/24
            load pptp

    pptpClient4:
            new -i ng4 pptp4 pptp4
            set ipcp ranges 192.168.1.3/24 192.168.1.105/24
            load pptp

    pptpClient5:
            new -i ng5 pptp5 pptp5
            set ipcp ranges 192.168.1.3/24 192.168.1.105/24
            load pptp

    pptpClient6:
            new -i ng6 pptp6 pptp6
            set ipcp ranges 192.168.1.3/24 192.168.1.105/24
            load pptp

    pptpClient7:
            new -i ng7 pptp7 pptp7
            set ipcp ranges 192.168.1.3/24 192.168.1.105/24
            load pptp

    pptpClient8:
            new -i ng8 pptp8 pptp8
            set ipcp ranges 192.168.1.3/24 192.168.1.105/24
            load pptp

    pptpClient9:
            new -i ng9 pptp9 pptp9
            set ipcp ranges 192.168.1.3/24 192.168.1.105/24
            load pptp

    pptp:
            set iface disable on-demand
            set iface enable proxy-arp
            set iface idle 3600
            set iface mtu 1500
            set iface enable tcpmssfix

            set bundle enable multilink
            set bundle enable round-robin
            set bundle enable crypt-reqd

            set link yes acfcomp protocomp
            set link no pap chap
            set link enable chap
            set link keep-alive 10 60
            set link mtu 1500

            set ipcp yes vjcomp
            set ipcp dns 192.168.1.250
            set ipcp nbns 192.168.1.11

            set bundle enable compression
            set ccp yes mppc
            set ccp yes mpp-e40
            set ccp yes mpp-e128
            set ccp yes mpp-stateless

    [MPD.LINKS]
    #
    # For our PPTP server
    # (Local DNS provides the public IPs for the 2 net connections, zen being
    public2 and demon being public)
    # I have so far been unsuccessful in getting mpd to listen to 2 IPs at the
    same time on the same links

    pptp0:
            set link type pptp
            set pptp self armadillo.public2.lan.eorigen.com
            set pptp enable incoming
            set pptp disable originate

    pptp1:
            set link type pptp
            set pptp self armadillo.public2.lan.eorigen.com
            set pptp enable incoming
            set pptp disable originate
    pptp2:
            set link type pptp
            set pptp self armadillo.public2.lan.eorigen.com
            set pptp enable incoming
            set pptp disable originate
    pptp3:
            set link type pptp
            set pptp self armadillo.public2.lan.eorigen.com
            set pptp enable incoming
            set pptp disable originate
    pptp4:
            set link type pptp
            set pptp self armadillo.public2.lan.eorigen.com
            set pptp enable incoming
            set pptp disable originate
    pptp5:
            set link type pptp
            set pptp self armadillo.public.lan.eorigen.com
            set pptp enable incoming
            set pptp disable originate
    pptp6:
            set link type pptp
            set pptp self armadillo.public.lan.eorigen.com
            set pptp enable incoming
            set pptp disable originate
    pptp7:
            set link type pptp
            set pptp self armadillo.public.lan.eorigen.com
            set pptp enable incoming
            set pptp disable originate
    pptp8:
            set link type pptp
            set pptp self armadillo.public.lan.eorigen.com
            set pptp enable incoming
            set pptp disable originate
    pptp9:
            set link type pptp
            set pptp self armadillo.public.lan.eorigen.com
            set pptp enable incoming
            set pptp disable originate

    [MPD Log File]
    I havent yet worked out how to get mpd into its own log file - have to
    modify syslog.conf I believe. My current all.log file is very very big and
    has lots of mpd stuff in, but would consitute a 10mb file. Is there anything
    in particular you are looking for or would you like me to upload it to a
    webserver somewhere?

    Thanks for your help - going to try the patch now, will let you know the
    results. 

    --
Dan Hardiker [dhardiker@eorigen.com]
ADAM Systems Engineer
eOrigen Ltd
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  • Next message: Michael Bretterklieber: "Re: MPD Issues - Errors and Mysterious Packet Loss"

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