[pptp-server] pptpd 0.9.16 / Win98 performance problem

[tmk]

So does this packet loss occur at the time of hitting the internal website,
before, after or independantly.. Will it happen if just ping is used? There
might be some sort of leak in the gre forwarding stuff.. but i need some
more info before i can check it out. Sounds like it's dropping lots of
packets.

Kevin
----- Original Message -----
From: Chris Hyde <chris at electricmail.com>
To: <pptp-server at lists.schulte.org>
Sent: Friday, September 10, 1999 6:07 PM
Subject: [pptp-server] pptpd 0.9.16 / Win98 performance problem


> Hi there,
>
> Has anything been resolved with the pptpd / Windows 98 performance
> issue? I've just read through the archives and there seems to be
> no answer.
>
> My problem:
>
> RedHat 6.0 2.2.10 kernel pptpd 0.9.16 Server on a 3Mb/s fibre
> Win98 client on a cable modem connection.
>
> Usual ping is ~25ms.
>
> Connect via VPN and start a ping on the server back to my client:
>
> PING x.x.x.x (x.x.x.x): 56 data bytes
> 64 bytes from x.x.x.x: icmp_seq=0 ttl=128 time=33.3 ms
> 64 bytes from x.x.x.x: icmp_seq=2 ttl=128 time=32.5 ms
> 64 bytes from x.x.x.x: icmp_seq=3 ttl=128 time=32.9 ms
> 64 bytes from x.x.x.x: icmp_seq=4 ttl=128 time=31.7 ms
> 64 bytes from x.x.x.x: icmp_seq=5 ttl=128 time=35.8 ms
> 64 bytes from x.x.x.x: icmp_seq=6 ttl=128 time=35.6 ms
>
> All great so far, then I actually use the connection from the client
> side (hit an internal website). Before the website is loaded I see:
>
> 64 bytes from x.x.x.x: icmp_seq=10 ttl=128 time=42.2 ms
> 64 bytes from x.x.x.x: icmp_seq=11 ttl=128 time=60.6 ms
> 64 bytes from x.x.x.x: icmp_seq=13 ttl=128 time=2690.4 ms
> 64 bytes from x.x.x.x: icmp_seq=14 ttl=128 time=4331.3 ms
> 64 bytes from x.x.x.x: icmp_seq=18 ttl=128 time=495.5 ms
> 64 bytes from x.x.x.x: icmp_seq=19 ttl=128 time=6763.5 ms
> 64 bytes from x.x.x.x: icmp_seq=20 ttl=128 time=6072.7 ms
> 64 bytes from x.x.x.x: icmp_seq=21 ttl=128 time=7075.6 ms
> 64 bytes from x.x.x.x: icmp_seq=22 ttl=128 time=6081.9 ms
> 64 bytes from x.x.x.x: icmp_seq=23 ttl=128 time=6036.2 ms
> 64 bytes from x.x.x.x: icmp_seq=24 ttl=128 time=5977.3 ms
> 64 bytes from x.x.x.x: icmp_seq=25 ttl=128 time=10531.3 ms
>
> ... and then the connection will finally break down entirely and no
> data will be transferred. There is not a connection problem between me
> and the server at all. At the time of testing I was getting <20ms and
> no packet loss.
>
> I tried tweaking the PCKT_RECV_WINDOW_SIZE and this improved performance
> but I would eventually get the same out-of-sync like behaviour where
> the pings would go through the roof and stay there.
>
> Higher WINDOW_SIZE's would just put this off for a few more pages ...
>
> Anyone have any answers for this one?
>
>
> --
> **********************************************************************
> Chris Hyde
> The Electric Mail Company
>
> Voice : (604) 482-1111                  Info  :   www.electricmail.com
> Fax   : (604) 482-1110                  Email : chris at electricmail.com
>
> Lister:  We want no muffins, no toast, no tea cakes, no buns, baps,
>          baggets or bagels. No croissants, no crumpets, no pancakes,
>          no potato cakes, and no hot cross buns. And definitely no
>          smegging flapjacks!
> Toaster: Ah! So you're a waffle man!
>
> ***********************************************************************
>
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