[H-GEN] Mail problems.......

[Michael Anthon]

On Tuesday, September 23, 1997 12:17 AM, Robert Brockway 
[SMTP:robert at zen.humbug.org.au] wrote:
><snip>
>
> For a modem using hw compression, the computer modem speed should
> be >= 4 times the modem bps rate.  for 28k8, use 115k, for 14k4 use 56k,
> etc.

Modem<->computer rate is 56k.  Doesn't seem to work reliably at 115k.  I 
think this is a limitation of the modem as I also have problems at that 
speed on my Cyrix 166+.  Well, just explained that one, the modem manual 
says the terminal speed is 300-56k.  It does actually work at 115k, but not 
very well.

> > 	- Can your ISP really cope with such a large MTU? Robert's
> > 	  scripts uses a (somewhat low) value of 296, the default is
>
> Ah, yes.  I have been using 296 for sometime, so it ended up as default
> in the script.  I'll be changing this.
>
> > 	  (I think) 1005, and that's also want Prentice (UQ)
> > 	  recommends (I think). I'd try dropping it to ~500, at least.
> > 	  (move it gradually back up once you get it working)
>
> I thought alot of places were going 1500 for all modems connections,
> but not sure what prenticeis doing, so this is probably right on the
> money.

My ISP uses Linux and the MTU is negotiated, so I would assume that 1500 is 
ok.  I set mine to 552 a little while ago and no obvious improvement was 
forthcoming

>
> > 	- What is your MRU set to? Changing this _may_ affect the
> > 	  error rate (my guess would be the smaller, the less that
> > 	  errors will affect your throughput). 1500 has worked for me
> > 	  quite pleasantly, although again Robert's script uses 296.
>
> Easy to change.  find the references to 296 and change them to 1500 
(there
> are two of them on the same line - one for mtu anf one for mru).
>

Can you use a different value for MRU and MTU?  Most documentation 
indicates you can, but I can find no way to determine what the MRU actually 
is.  ifconfig gives the MTU only.

<snip>

> > Another hint is to add the argument "debug" to the pppd line, and look
> > at what appears in /var/log/debug for anything useful. This might give
> > you a clue as to when the RX errors are happening.
>
Tried that..... i get the following errors and these seem to coincide with 
the initial connection to the smtp server

Sep 22 23:30:19 linux pppd[18500]: Unknown protocol (0x7) received
Sep 22 23:30:19 linux pppd[18500]: Unknown protocol (0xd) received
Sep 22 23:30:19 linux pppd[18500]: Unknown protocol (0x4d) received
Sep 22 23:30:19 linux pppd[18500]: Unknown protocol (0x5468) received
Sep 22 23:30:19 linux pppd[18500]: Unknown protocol (0x666f) received
Sep 22 23:30:19 linux pppd[18500]: Unknown protocol (0x7) received


Regards

Michael Anthon

PS  Thanks for the help on thsi guys
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