07-06-2012
I think That I understand the question being asked by NH2.
There's a system with two interfaces A and B connected to A and B LAN's. Interface A is up and working with an ip address and LAN A users can access it.
Interface B is down (no ip address) but is there a way that LAN B users could be told (by enquiring on the MAC address or something) that the system has an alternative address on LAN A (assuming of course that there is a gateway between LAN A and LAN B that they could go through).
The only answer that I can think of (and I'm not a networking guru) is, yes, let them call for the system by name and use a DNS server.
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LES(8) Maintenance Commands LES(8)
NAME
les, bus - ATM LAN Emulation service demons
SYNOPSIS
les [-d module] [-m module] [-f configuration_file]
bus [-d module] [-m module] [-f configuration_file]
DESCRIPTION
LE Service consists of three components: LAN Emulation Configuration Server (lecs(8)), LAN Emulation Server (les) and Broadcast and Unknown
Server (bus).
Les performs the control coordination function for the emulated LAN. LE clients register MAC addresses and/or route descriptors they rep-
resent to les, and later query it when they want to resolve MAC addresses/route descriptors into ATM addresses. Other LE control messages
which are to be distributed to every client in ELAN are also sent to les. Les forwards these messages using Control Distribute VCC which it
has set up to every client in ELAN.
Bus handles data sent by clients to broadcast and multicast MAC addresses and some of the data directed to unicast addresses. LE Client has
a possibility to send data directed to some unicast address to the bus before target's ATM address has been resolved and the Data Direct
VCC has been established.
Configuration file example for les and bus:
[main]
memdebug=True
debug=True
[load]
#memdebug=True
#debug=True
[conn]
debug=True
#S1, LE Server's ATM address
#S1=:47:00:23:00:00:00:03:00:00:01:00:02:01:00:20:ea:00:05:aa:00
S1=:47:00:23:00:00:00:03:03:00:01:00:02:01:00:20:ea:00:0a:e9:01
#S2, LAN Type
S2="802.3"
#S3, Maximum Frame Size
S3=1516
#S4, Join Timeout, s
S4=15
#S5, Maximum Frame Age, s
S5=6
#S6, BUS Atm address
S6=:47:00:23:00:00:00:03:03:00:01:00:02:01:00:20:ea:00:0a:e9:02 #viulu
#S6=0,0,170
#ELANNAME="asdf"
The configuration file contains each modules name in brackets followed by variable definitions for that module. The definitions are of form
variable=value, where value can be either an integer, a truth value (True/False), a string enclosed in double quotes ("string") or an ATM
address in hexadecimal format. Variables that can be set are the debug/memdebug for each module and variables S1-S6 as defined in LE speci-
fication.
S1=Address of the LES. This address is used in ATM
signalling.
S2=Type of the emulated LAN. Valid values is "802.3".
S3=Maximum frame size. Valid value is 1516.
S4=Join Timeout. Time in seconds which LES waits for
LE_JOIN_REQUEST before tearing down a connection.
S5=Maximum frame Age. Currently not used.
S6=Address of the BUS. This address is used in ATM signalling.
ELANNAME= Name of the emulated LAN
SIGHUP causes restart of the server. All resources are released and server is started. SIGUSR1 causes the server to dump its internal
state. SIGUSR2 shuts down the server (hopefully) gracefully.
OPTIONS
-d module
Set debugging messages on for a module. "All" sets debugging on for all modules.
-m module
Set memory debugging messages on for a module. "All" sets debugging on for all modules.
-f configuration_file
Use the specified configuration file instead of .lanevars.
FILES
.lanevars configuration file
BUGS
Servers don't establish point-to-multipoint connections to LE clients as the specification states, which means that some LE clients won't
work with these servers.
Supports only IEEE 802.3 / Ethernet type of ELANs.
This manual page is confusing.
AUTHOR
Marko Kiiskila, TUT <carnil@cs.tut.fi>
SEE ALSO
lecs(8), atmsigd(8), zeppelin(8)
Linux Sep 11, 1996 LES(8)