MLD6QUERY(8) BSD System Manager's Manual MLD6QUERY(8)NAME
mld6query -- send multicast listener query
SYNOPSIS
mld6query [-dr] intface [maddr]
DESCRIPTION
The mld6query utility sends an IPv6 multicast listener discovery (MLD) query packet toward the specified multicast address, maddr, toward
interface intface. If you omit maddr, linklocal all nodes multicast address(ff02::1) is used.
After sending a query, mld6query waits for replies for at most 10 seconds. If a reply is returned, mld6query prints it with its type and
then waits for another reply.
This program is provided only for debugging. It is not necessary for normal use.
With -d, mld6query will transmit MLD done packet instead of MLD query packet. With -r, similarly, MLD report packet will be transmitted.
-dr options are for debugging purposes only.
EXIT STATUS
The program exits with 0 on success, non-zero on failures.
HISTORY
The mld6query utility first appeared in WIDE/KAME IPv6 protocol stack kit.
BUGS
The mld6query utility does not take care of multicast addresses which have non link-local scope.
BSD May 17, 1998 BSD
Check Out this Related Man Page
MAP-MBONE(8) System Manager's Manual MAP-MBONE(8)NAME
map-mbone - Multicast connection mapper
SYNOPSIS
/usr/sbin/map-mbone [ -d debug_level ] [ -f ] [ -g ] [ -n ] [ -r retry_count ] [ -t timeout_count ] [ starting_router ]
DESCRIPTION
map-mbone attempts to display all multicast routers that are reachable from the multicast starting_router. If not specified on the command
line, the default multicast starting_router is the localhost.
map-mbone traverses neighboring multicast routers by sending the ASK_NEIGHBORS IGMP message to the multicast starting_router. If this mul-
ticast router responds, the version number and a list of their neighboring multicast router addresses is part of that response. If the
responding router has recent multicast version number, then map-mbone requests additional information such as metrics, thresholds, and
flags from the multicast router. For each new occurrence of neighboring multicast router in the reply and provided the flooding option has
been selected, then map-mbone asks each of this multicast router for a list of neighbors. This search for unique routers will continue
until no new neighboring multicast routers are reported.
INVOCATION
"-d" option sets the debug level. When the debug level is greater than the default value of 0, addition debugging messages are printed.
Regardless of the debug level, an error condition, will always write an error message and will cause map-mbone to terminate. Non-zero
debug levels have the following effects:
level 1
packet warnings are printed to stderr.
level 2
all level 1 messages plus notifications down networks are printed to stderr.
level 3
all level 2 messages plus notifications of all packet timeouts are printed to stderr.
"-f" option sets flooding option. Flooding allows the recursive search of neighboring multicast routers and is enable by default when
starting_router is not used.
"-g" option sets graphing in GraphEd format.
"-n" option disables the DNS lookup for the multicast routers names.
"-r retry_count" sets the neighbor query retry limit. Default is 1 retry.
"-t timeout_count" sets the number of seconds to wait for a neighbor query reply before retrying. Default timeout is 2 seconds.
IMPORTANT NOTE
map-mbone must be run as root.
SEE ALSO mrouted(8), mrinfo(8), mtrace(8)AUTHOR
Pavel Curtis
4.2 Berkeley DistributionMAP-MBONE(8)
Introduction
Originally, we only had one shell on unix. When ran a command, the shell would attempt to invoke one of the exec() system calls on it. It the command was an executable, the exec would succeed and the command would run. If the exec() failed, the shell would not give up, instead it... (3 Replies)
FreeBSD Kernel Internals, Dr. Marshall Kirk McKusick
nwbqBdghh6E
The first hour of Marshall Kirk McKusick's course on FreeBSD kernel internals based on his book, The Design and Implementation of the FreeBSD Operating System. (0 Replies)
Introduction
I have seen some misinformation regarding Unix file permissions. I will try to set the record straight. Take a look at this example of some output from ls:
$ ls -ld /usr/bin /usr/bin/cat
drwxrwxr-x 3 root bin 8704 Sep 23 2004 /usr/bin
-r-xr-xr-x 1 bin bin ... (6 Replies)
Suppose I have a main() function with only one malloc statement allocating say some 1 gb memory. Also say my system has 1 gb of ram.
main()
{
malloc(1gb)
return(0)
}
The program above exits without freeing the memory.
In this case will the 1 gb of heap memory be returned... (9 Replies)
I see lot of ad-hoc shell scripts in our servers which don't have a shebang at the beginning .
Does this mean that it will run on any shell ?
Is it a good practice to create scripts (even ad-hoc ones) without shebang ? (16 Replies)
Hi everyone,
I know the following questions are noobish questions but I am asking them because I am confused about the basics of history behind UNIX and LINUX.
Ok onto business, my questions are-:
Was/Is UNIX ever an open source operating system ?
If UNIX was... (21 Replies)
A shout out to Scott who gave me a helping hand to turn a simple sample Vue.js app I wrote yesterday into a Vue.js component:
Vue.component("unix-time", {
template: `<div class="time">{{unixtime}}</div>`,
data() {
return {
unixtime: ""
};
},
methods: {
... (1 Reply)
i read here that linux provides no way to determine when a directory was created.
https://www.unix.com/shell-programming-and-scripting/157874-creation-date-directory.htmlI have a directory /home/andy/scripts that had a README file in it.
That file says
I put the script in that directory and... (3 Replies)
Hello.
I can use any particular (stupid or not) format when using bash date command.
Example :
~> date --date "now" '+%Y-%m-%d %H!%M!%S'
2019-06-03 12!55!33or
~> date --date "now" '+%Y£%m£%d %H¤%M¤%S'
2019£06£03 12¤57¤36
or
~> date --date "now" '+%Y-%m-%d %H-%M-%S'
2019-06-03 12-58-51
... (4 Replies)
Morning All
So, I am starting looking into the world of UNIX for a new job (luckily not my primary function!) and I am looking to get stared. Like anything I seem to learn best by trying things out first in an environment but I have a key question:
Currently I use Oracle VirtualBox, can... (8 Replies)
I've installed Slack 14.2 on /dev/sda1 (/dev/sda2 is swap) and FreeBSD 12 on /dev/sda3 and lilo is the boot manager.
FreeBSD slices are as follows;
/ on /dev/ada0S3a, swap on /dev/ada0s3e, /var on /dev/ada0s3b, /tmp on /dev/ada0s3d and /usr on /dev/ada0s3f.
I hesitate to install Solaris 10... (2 Replies)
I'm trying to use a bash script for a psych experiment that involves listening to sound files and responding. If I have something like the code below, how can I make sure that a key press is assigned to RESPONSE only after the second echo statement?
for i in 1 2 3; do
echo "Ready?"
sleep 2
... (10 Replies)