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scp on a ppp over pptp VPN is very slow. The transfer keeps stalling. The first 128Kb is fast after that it stalls and restarts....takes about 1/2 hour to transfer ...
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  1. #1
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    scp stalls using ppp/pptp vpn


    scp on a ppp over pptp VPN is very slow. The transfer keeps stalling. The first 128Kb is fast after that it stalls and restarts....takes about 1/2 hour to transfer 500KB. The connection is over a 56k modem. Related processes ( ppp, pptpd, scp )

    Thanks for any suggestions.

  2. #2
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    How have you configured PPP over the PPTP session?

    If you end up with TCP over TCP then the connection can stall because both TCP layers try to do congestion and retransmission management. More details can be found here.

    If you can give us more specifics of what you have set up we will be able to give you more definitive information.

    Let us know how you get on,

    Chris...
    To be good, you must first be bad. "Newbie" is a rank, not a slight.

  3. #3
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    [root@dev devices]# cat /etc/pptpd.conf
    ################################################## #############################
    # $Id: pptpd.conf,v 1.8 2004/04/28 11:36:07 quozl Exp $
    #
    # Sample Poptop configuration file /etc/pptpd.conf
    #
    # Changes are effective when pptpd is restarted.
    ################################################## #############################
    option /etc/ppp/options.pptpd
    localip 192.168.1.1
    remoteip 192.168.1.2-100

    [root@dev devices]# cat /etc/ppp/options.pptpd
    name *
    lock
    mtu 1450
    mru 1450
    proxyarp
    auth
    ipcp-accept-local
    ipcp-accept-remote
    lcp-echo-failure 3
    lcp-echo-interval 5
    deflate 0

    +mschap-v2
    mppe required,stateless
    ms-dns 192.168.1.1
    debug

    [root@dev ppp]# cat options
    lock

    Is this all you need?

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  5. #4
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    more info

    I did a "ls | xargs cat " on /proc/sys/net/ipv4 which contain

    conf
    icmp_echo_ignore_all
    icmp_echo_ignore_broadcasts
    icmp_errors_use_inbound_ifaddr
    icmp_ignore_bogus_error_responses
    icmp_ratelimit
    icmp_ratemask
    igmp_max_memberships
    igmp_max_msf
    inet_peer_gc_maxtime
    inet_peer_gc_mintime
    inet_peer_maxttl
    inet_peer_minttl
    inet_peer_threshold
    ip_autoconfig
    ip_default_ttl
    ip_dynaddr
    ip_forward
    ipfrag_high_thresh
    ipfrag_low_thresh
    ipfrag_max_dist
    ipfrag_secret_interval
    ipfrag_time
    ip_local_port_range
    ip_nonlocal_bind
    ip_no_pmtu_disc
    neigh
    route
    tcp_abc
    tcp_abort_on_overflow
    tcp_adv_win_scale
    tcp_app_win
    tcp_congestion_control
    tcp_dsack
    tcp_ecn
    tcp_fack
    tcp_fin_timeout
    tcp_frto
    tcp_keepalive_intvl
    tcp_keepalive_probes
    tcp_keepalive_time
    tcp_low_latency
    tcp_max_orphans
    tcp_max_syn_backlog
    tcp_max_tw_buckets
    tcp_mem
    tcp_moderate_rcvbuf
    tcp_no_metrics_save
    tcp_orphan_retries
    tcp_reordering
    tcp_retrans_collapse
    tcp_retries1
    tcp_retries2
    tcp_rfc1337
    tcp_rmem
    tcp_sack
    tcp_stdurg
    tcp_synack_retries
    tcp_syncookies
    tcp_syn_retries
    tcp_timestamps
    tcp_tso_win_divisor
    tcp_tw_recycle
    tcp_tw_reuse
    tcp_window_scaling
    tcp_wmem

    values

    cat: conf: Is a directory
    0
    1
    0
    1
    250
    6168
    20
    10
    120
    10
    600
    120
    65664
    0
    64
    0
    0
    262144
    196608
    64
    600
    30
    32768 61000
    0
    0
    cat: neigh: Is a directory
    cat: route: Is a directory
    1
    0
    2
    31
    bic
    0
    0
    0
    60
    0
    75
    9
    7200
    0
    32768
    1024
    180000
    98304 131072 196608
    1
    0
    0
    3
    1
    3
    15
    0
    4096 87380 174760
    0
    0
    5
    1
    5
    1
    3
    0
    0
    1
    4096 16384 131072

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