Migrating X.25 over PSI to X.25 over TCP/IP (XOT)

Example 1 shows a sample X.25 configuration with XOT specific parameters

# Likely runstring: x25init -c /etc/x25/x25init_xot_def -X

/etc/x25/x121_to_ip_map

X.121 55555 # X.121 address

X.121_packet 55555 # use a null (i.e. length 0) packet

# address (TransPac addressing)

name xot0 # interface name for Level 3 access

# It MUST be of the format xot#<instance number>

# where "instance number" can take a value from 0 to 9

# XOT Specific Parameters

local_tcpip_address 10.0.0.2 # TCP/IP address of local XOT interface

# Level 3 Parameters

# virtual circuit parameters

# logical channel id, start num [1-4095], type, how many

lci 1 pvc 4 # 4 permanent VCs

lci 6 svc 248 # 248 two-way switched VCs

networktype TRANSPAC # CCITT 1984, DTE (see /etc/x25/x25_networks)

fast_select enabled # allow incoming calls with call user data

reverse_charge enabled # allow incoming calls requesting reverse changes

def_inpacketsize 1024 # default packetsize

def_outpacketsize 1024 # default packetsize

def_inwindow 7 # default window size

def_outwindow 7 # default window size

def_inthruputclass 19200 # default thruput class

# Flow Control Parameters, needs to be enabled as per RFC 1613

flowcontrol on # flow control negotiation allowed

neg_inpacketsize 1024 # offered packet size if using flow control

negotiation

neg_outpacketsize 1024 # offered packetsize if using flow control

negotiation

neg_inwindow 7 # offered window size if using flow control negotiation

neg_outwindow 7 # offered window size if using flow control negotiation

thruputclass on

neg_inthruputclass 19200 # offered thruput class if using thruput class

negotiation

XOT Specific Configuration File

This is an XOT specific configuration file and contains information about every participating X.25

system and their IP Addresses. It is unique to the host.

Following is the syntax of this file:

#Destination X.21 Address Destination IP Address

# Local(LCN),Remote(LCN),LocalInterfacename,RemoteInterfacename,Remoteip

It captures the routing information for SVCs and PVCs.

NOTE: The Local(LCN), Remote(LCN), LocalInterfacename, RemoteInterfacename and Remoteip

fields are applicable only for PVC setup.

16 Migrating X.25 over PSI to XOT