Fw: [ILUG] Nasty isdn...

[Brendan Bradley]

Not sure if this will help, but when working with an ISP on support, the
following was noted:

( Some ) ISDN connections through the 1891 access number exhibited the
strangest behaviour, apparently at the lowest level, causing connections to
be effectively unusable for smtp of all things, reporting packet level
problems ( ? ) where ping worked fine. ( from smtp server logs )

The solution was to find out the 'true' direct dial phone number to the hunt
group ( modem banks ), and not go through the re-routed 1891 *** ****
number.

An NT server gave a 'framing error' error message at the hardware level
( ? ), but when dialled in directly using the local number, it worked every
time.

I should stress that this problem only affected SMTP, not web / ftp / ping.

I was sceptical given that ping showed 0% packet loss, until I saw it for
myself.

Hope this helps,

Brendan.




----- Original Message -----
From: Phil Trickett <phil.trickett at marine.ie>
To: 'Irish LUG list' <ilug at linux.ie>
Sent: Friday, September 15, 2000 12:29 PM
Subject: RE: [ILUG] Nasty isdn...


> Say,
>
> I have just read this.
>
> It wouldn't be a problem of the line "just hanging up for no reason" or
> "pretending that it is connected when it isn't?" would it, because if it
is,
> I have this problem too, with a LASAT external ISDN TA.
>
> Works fine under windows though.  Kind of makes a big dent in the
automated
> dial up mail grabber plans.
>
>
> Cheers,
>
> Phil
> -----Original Message-----
> From: ilug-admin at linux.ie [mailto:ilug-admin at linux.ie]On Behalf Of John
> P . Looney
> Sent: 15 September 2000 12:25
> To: Irish LUG list
> Subject: [ILUG] Nasty isdn...
>
>
>  I posted about three weeks ago about some nasty ISDN problems that I
> couldn't solve. And I still can't, and now it's really annoying me. I
> traced through on the Eircom side, and they can see the connection, and
> then it seems as if the card (HiSax based) on this side "powers off". Very
> odd. I've tryed two cards - both work in windows, not on linux.
>
>  This works *fine* in windows. On linux...I just get a
>
>  "local hangup. cause: 001B"
>
>  ... in the logs. There is some explanation in the docs about this, as to
> why it's caused, but they are in german, so they aren't as much help as
> the might be. And does anyone know what a "MSN" field is ? (Looks like a
> replacment for caller id or something).
>
>  If anyone has had loads of fun with ISDN, could they call me on 086
> 8208986, and much pints will flow your way, if I can get this fixed.
>
>  Failing that....some way of getting a win98 machine with a working ISDN
> card to forward on much needed mail from Eircom to a linux machine would
> be appriciated...this is urgent...
>
> Kate
>
> --
> The words of the unwary are apt to cause needless pain and bloody
violence.
>                                                         - Zen Master Greg
>
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