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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LEARN ABOUT DEBIAN
vde_tunctl
VDE_TUNCTL(8) System Manager's Manual VDE_TUNCTL(8)
NAME
vde_tunctl -- create and manage persistent TUN/TAP interfaces
SYNOPSIS
vde_tunctl [-f tun-clone-device] [-u owner] [-t device-name]
vde_tunctl [-f tun-clone-device] -d device-name
DESCRIPTION
vde_tunctl allows the host sysadmin to preconfigure a TUN/TAP device for use by a particular user. That user may open and use the device,
but may not change any aspects of the host side of the interface.
vde_tunctl is a simple copy of tunctl done for practical purposes.
USAGE
To create an interface for use by a particular user, invoke tunctl without the -d option:
# vde_tunctl -u someuser
Set 'tap0' persistent and owned by uid 500
Then, configure the interface as normal:
# ifconfig tap0 192.168.0.254 up
# route add -host 192.168.0.253 dev tap0
# bash -c 'echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp'
# arp -Ds 192.168.0.253 eth0 pub
To delete the interface, use the -d option:
# vde_tunctl -d tap0
Set 'tap0' nonpersistent
SEE ALSO
vde_switch(1) vde_plug2tap(1)
AUTHOR
tunctl was written by Jeff Dike jdike@karaya.com
This manual page is based on tunctl manual page written by Matt Zimmerman mdz@debian.org for the Debian GNU/Linux system.
VDE_TUNCTL(8)