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Conference ozrock::x25_osf

Title:	Proudly built by the engineers of NaC Australia

Moderator:	DELNI::MUGGERIDGE

Created:	Mon Oct 12 1992
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	908
Total number of notes:	3829

871.0. "X25 over IP. How many sessions at the same time?" by RULLE::KLASSON (Sven-Olof Klasson @GOO) Wed Feb 26 1997 01:54

Hi,

A customer has a Digital-Unix system that will use TCP/IP over X25 to 
communicate with a large number of nodes. Total number of nodes will be
around 2000.

An estimate by the customer is that worst case will be 500 of these nodes 
having an open X.25 channel with the Unix system at the same time (half inbound,
half outbound).
The X.25 network is a private network that allows 4095 channels so this should
not be the limit.

The customer belive there is some limit when IP over X.25 is started with
"x25ifconfig start x y"
Were x and y limits number of outbound/inbound simultanious connections.

Is there a limit here?
Is 500 connections at the same time realistic?
Does the system need to be tuned or configured for this?

Thanks,
Sven-Olof Klasson, CSC Sweden.

T.R Title User Personal
Name Date Lines

871.1 OZROCK::HARTWIG Arthur Hartwig, TaN Engineering-Australia Wed Mar 05 1997 16:13 21

T.R	Title	User	Personal Name	Date	Lines
871.1		OZROCK::HARTWIG	Arthur Hartwig, TaN Engineering-Australia	`Wed Mar 05 1997 16:13`	21
	> The customer belive there is some limit when IP over X.25 is started > with "x25ifconfig start x y" Thats a reasonable belief since the man page for x25ifconfig says as much. > Were x and y limits number of outbound/inbound simultanious connections. Not sure what you mean by "simultaneous connections" - the man page says "calls" implying X.25 calls. (Connections could mean TCP links.) > Is there a limit here? Yes, see the man page. > Is 500 connections at the same time realistic? "Connections" meaning X.25 calls? 500 X.25 calls is realistic if the traffic is not too big, where "too big" will depend on what other activity is happening on the system, X.25 packet size, etc etc. > Does the system need to be tuned or configured for this? I expect if you want to be able to support IP over 500 X.25 calls that you will need to take some steps to ensure there is sufficient kernel memory. I believe there are some guidlines in the SPD.

> The customer belive there is some limit when IP over X.25 is started 
> with "x25ifconfig start x y"
	Thats a reasonable belief since the man page for x25ifconfig
says as much.

> Were x and y limits number of outbound/inbound simultanious connections.
	Not sure what you mean by "simultaneous connections" - the man page
says "calls" implying X.25 calls. (Connections could mean TCP links.)

> Is there a limit here?
	Yes, see the man page.

> Is 500 connections at the same time realistic?
	"Connections" meaning X.25 calls? 500 X.25 calls is realistic
if the traffic is not too big, where "too big" will depend on what
other activity is happening on the system, X.25 packet size, etc etc.

> Does the system need to be tuned or configured for this?
	I expect if you want to be able to support IP over 500 X.25 calls
that you will need to take some steps to ensure there is sufficient kernel
memory. I believe there are some guidlines in the SPD.