ndsend(8) Containers ndsend(8)NAME
ndsend - send a Neighbor Advertisement NDP packet
SYNOPSIS
ndsend address interface
DESCRIPTION
The ndsend utility is called by arpsend(8) for IPv6 addresses to send an unsolicited Neighbor Advertisement ICMPv6 multicast packet
announcing a given IPv6 address to all IPv6 nodes as per RFC4861.
OPTIONS
address
Specify the IPv6 address to be advertised.
interface
Specify the network interface to send an advertisement from.
EXIT STATUS
ndsend returns 0 upon successful execution. If something goes wrong, it returns an appropriate error code:
1 EXC_USAGE
Usage error
2 EXC_SYSTEM
System error
EXAMPLES
To send a Neighbor Advertisement ICMPv6 on interface eth0 with IPv6 address 2001:DB8::1:
ndsend 2001:DB8::1 eth0
SEE ALSO arpsend(8), vzctl(8).
LICENSE
Copyright (C) 2000-2011, Parallels, Inc. Licensed under GNU GPL.
AUTHOR
This manual page was initially written by Thorsten Schifferdecker <tsd@debian.systs.org> for the Debian GNU/Linux system (but may be used
by others).
OpenVZ 28 Jun 2011 ndsend(8)
Check Out this Related Man Page
NDISC6(8) System Manager's Manual NDISC6(8)NAME
ndisc6 - ICMPv6 Neighbor Discovery tool
SYNOPSIS
ndisc6 [-1mnqv] [-r attempts] [-w wait_ms] < IPv6 address> <iface>
DESCRIPTON
NDisc6 is an Unix program which implements the ICMPv6 Neighbor Discovery in userland (it is normally done by the kernel). It is used to
lookup the link-layer address (layer 2 address, MAC in the case of Ethernet) of any on-link IPv6 node.
The IPv6 address of the node must be specified, as well as the networking interface on which to perform the lookup.
OPTIONS -1 or --single
Exit as soon as the first advertisement is received (default).
-h or --help
Display some help and exit.
-m or --multiple
Wait for possible duplicate advertisements and print all of them.
-n or --numeric
If the first parameter is not a valid IPv6 address, do not try to resolve it as a DNS hostname.
-q or --quiet
Only display link-layer address. Display nothing in case of failure. That is mostly useful when calling the program from a shell
script.
-r attempts or --retry attempts
Send ICMPv6 Neighbor Discovery that many times until a reply is received, or abort. By default, ndisc6 will try 3 times before
aborting (MAX_MULTICAST_SOLICIT and MAX_UNICAST_SOLICIT from RFC2461).
-V or --version
Display program version and license and exit.
-v or --verbose
Display verbose information. That is the default.
-w wait_ms or --wait wait_ms
Wait wait_ms milliseconds for a response before retrying. By default, ndisc6 waits 1 second between each attempts (RETRANS_TIMER
from RFC2461).
DIAGNOSTICS
If you get no response while you know the remote host is up, it is most likely that it is not on-link, that is to say, you must cross one
or more routers to reach it. By design, IPv6 nodes ignore ICMPv6 Neighbor Discovery packets received from nodes not on the same link (i.e.
Ethernet segment), for the sake of security. Technically, that is done by ensuring that the Hop limit (TTL) is 255.
Note that you cannot use ndisc6 to lookup the local host's link-layer address.
SECURITY
ndisc6 should be setuid root to allow use by non privileged users. It will drop its root privileges before any attempt is made to send or
receive data from the network to reduce the possible impact of a security vulnerability.
SEE ALSO ping6(8), rdisc6(8), ipv6(7)AUTHOR
Remi Denis-Courmont <remi at remlab dot net>
$Id: ndisc6.8 658 2010-10-31 20:56:30Z remi $
http://www.remlab.net/ndisc6/
ndisc6 $Date: 2010-10-31 22:56:30 +0200 (dim. 31 oct. 2010) $ NDISC6(8)