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Re: TELEBAHN still there


 

On Mon, Apr 10, 2023 at 12:00?PM Hans Hübner <hans.huebner@...> wrote:
Hi Mantas,

this is a bit puzzling:? If I make an outbound connection to?14704100 (on?193.219.181.219), the connection is established with the default parameters:

*Apr 10 10:54:10.993: [193.219.181.219,1998/,64238]: XOT O P2 Call (22) 8 lci 1024
*Apr 10 10:54:10.993: ? From (6): 230001 To (8): 14704100
*Apr 10 10:54:10.997: ? Facilities: (6)
*Apr 10 10:54:10.997: ? ? Packet sizes: 128 128
*Apr 10 10:54:10.997: ? ? Window sizes: 2 2
*Apr 10 10:54:10.997: ? Call User Data (4): 0x01000000 (pad)
*Apr 10 10:54:11.077: [193.219.181.219,1998/,64238]: XOT I P2 Call Confirm (11) 8 lci 1024
*Apr 10 10:54:11.077: ? From (0): ?To (0):
*Apr 10 10:54:11.077: ? Facilities: (6)
*Apr 10 10:54:11.077: ? ? Packet sizes: 128 128
*Apr 10 10:54:11.077: ? ? Window sizes: 2 2

If I add the TELEBAHN profile to xot, however, the connection is refused:

*Apr 10 10:52:20.957: [193.219.181.219,1998/,35675]: XOT O P2 Call (22) 128 lci 1024
*Apr 10 10:52:20.957: ? From (6): 230001 To (8): 14704100
*Apr 10 10:52:20.957: ? Facilities: (6)
*Apr 10 10:52:20.957: ? ? Packet sizes: 1024 1024
*Apr 10 10:52:20.957: ? ? Window sizes: 15 15
*Apr 10 10:52:20.957: ? Call User Data (4): 0x01000000 (pad)
*Apr 10 10:52:21.045: [193.219.181.219,1998/,35675]: XOT I P2 Call Confirm (11) 128 lci 1024
*Apr 10 10:52:21.045: ? From (0): ?To (0):
*Apr 10 10:52:21.045: ? Facilities: (6)
*Apr 10 10:52:21.045: ? ? Packet sizes: 1024 1024
*Apr 10 10:52:21.045: ? ? Window sizes: 15 15
*Apr 10 10:52:21.045: XOT Call Confirm packet, Bad value for facility, Window size is not within permitted range
*Apr 10 10:52:21.045: [193.219.181.219,1998/,35675]: XOT O P2 Clear (5) 128 lci 1024
*Apr 10 10:52:21.045: ? Cause 3, Diag 66 (Invalid facility request/Facility parameter not allowed)

It seems that the xot listener on?192.168.178.9 is not using the TELEBAHN profile, but I'm not sure as I'm still very new to this.

I couldn't get it to work locally before either, but strangely now it works without issues between local systems. Actually, I *think* you have to unapply and re-apply the "xot access-group" configuration for it to pick up the new profile parameters (at least in my IOS version).

(Looks like "x25 subscribe windowsize permit 2 15" in the profile would allow for dynamic negotiation?)
?

I'm wondering why it was decided to have non-standard packet and window sizes in the first place?? I understand that they improve performance, but that's not really the point of TELEBAHN or is it? :)

--
Mantas Mikul?nas

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