Connectivity costs $1.50/minute. You pay for 20 second increments.
Speed is 2.4kbits (20KB/min)
It's a dial on demand router for a satellite based system
Any other thoughts? I'm obviously going to look at application specific
proxies, but I guess I'm hoping that someone might put me on to some
clever ideas to buffer packets or duplicate them with delay...
Thanks
Ed W
On 23/03/2013 21:11, John Lauro wrote:
Sounds like the main problem is your aggressive hangup due to
inactivity. It should be at least 4 times as the connect time, not
under half!. I suggest 6 minutes, but at least 2 minutes.
If you can't adjust that, probably the next best alternative is a
pre-emptive ping or something to wake up the modem about 25 seconds
before you want to connect, or just ping every 5 seconds until you get
a successful response
On Sat, Mar 23, 2013 at 12:33 PM, Ed W <lists@xxxxxxxxxxxxxx> wrote:
Hi, I have a dialup connection (yes they still exist) and PPP with demand
dial. I have a problem with the exponential backoff sending new SYN packets
when creating a new tcp connection. The problem is that the dialup
connection takes around 23 seconds to complete (and then hangs up 10 seconds
later due to inactivitity), but by then the gaps between SYN packets is very
long...
Unfortunately most operating systems send an initial SYN, then exponentially
backoff with intermittent resends, say after 1 sec, 2 secs, 4 secs, 8 secs,
16 secs, etc. So what we observe is that because the dialup connection
takes so long to complete, by then the tcp connection is only trying quite
intermittently to connect, eg you might well wait another 8+ seconds before
the next syn is resent, quite easily my demand dial connection will hangup
before the retransmit is even fired...
Does anyone have any suggestions on how I might fake this a little? I
effectively desire to simulate buffering syn packets before the PPP
connection comes up?
Thanks for any off the wall thoughts...
Ed W
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