17 Apr
2003
17 Apr
'03
12:17 p.m.
Hi all,
I have following setup. One Linux server (192.168.0) catering to various
windoze/Linux clients. DHCP is handling the leases. I want to find out which
all machines are in the network(alive) at any given point of time. Also, I
may have another sub-network(s) and a router.
Is there a reliable and efficient way to get "all" those machines (IP) that
are there?
Please help.
Thanks in advance.
--
regards,
~~~~~~~~~~~~~~~~~~~~~~~~~
Amit A. Redij
In a world without fences and walls, who needs Windows and Gates?
17 Apr
17 Apr
1:08 p.m.
On Thu, 17 Apr 2003, Amit Redij wrote:
Is there a reliable and efficient way to get
"all" those machines (IP)
that are there?
do a broadcast ping for about 1 second and then do arp.
Philip
--
What if everything is an illusion and nothing exists? In that case, I
definitely overpaid for my carpet.
-- Woody Allen, "Without Feathers"
1:26 p.m.
On 17/04/03 11:53 +0530, Amit Redij wrote:
I have following setup. One Linux server (192.168.0)
catering to various
windoze/Linux clients. DHCP is handling the leases. I want to find out which
all machines are in the network(alive) at any given point of time. Also, I
may have another sub-network(s) and a router.
Is there a reliable and efficient way to get "all" those machines (IP) that
are there?
man nmap.
Devdas Bhagat
5:06 p.m.
Hi,
Thanks for the info. It is working.
But broadcast ping and arp didnt work.
Thanks again.
On Thursday 17 April 2003 01:00 pm, Devdas Bhagat wrote:
On 17/04/03 11:53 +0530, Amit Redij wrote:
--
regards,
~~~~~~~~~~~~~~~~~~~~~~~~~
Amit A. Redij
In a world without fences and walls, who needs windows and gates?
I have following setup. One Linux server
(192.168.0) catering to various
windoze/Linux clients. DHCP is handling the leases. I want to find out
which all machines are in the network(alive) at any given point of time.
Also, I may have another sub-network(s) and a router.
Is there a reliable and efficient way to get "all" those machines (IP)
that are there?
man nmap.
Devdas Bhagat
5 May
5 May
4:33 p.m.
New subject: exclusive file locking
Hello,
I am facing a problem with file locking.
I have process A & process B, writing & reading a plain text data file
respectively. I can implement exclusive lock using fcntl() so that when A is
in the process of writing the file, B should not read at that instance.
However, I noticed that even if process A has got an exclusive lock on the
file, I can open the file manually (say vi) and modify the file.
I tried searching on the net and found an article at
http://www.security.nnov.ru/advisories/filelock.asp
which says Unix/linux has this problem.
Can someone help me plz?
thanks a lot.
regards,
Amit Redij
In a world without fences and walls, who needs windows and gates?
5:55 p.m.
New subject: exclusive file locking
Amit Redij wrote:
I have process A & process B, writing &
reading a plain text data file
respectively. I can implement exclusive lock using fcntl() so that when A is
in the process of writing the file, B should not read at that instance.
However, I noticed that even if process A has got an exclusive lock on the
file, I can open the file manually (say vi) and modify the file.
fcntl gives you _discretionary_ locking. Both process A and
process B need to cooperate on the use of locks. So, if you're
able to open (and write, though you haven't menioned this) the
file, it's probably because vi isn't checking for the lock.
See also flock (which has different semantics than fcntl) and
search for unix/linux file locking mechanisms on google.
-Manish
--
"The statements and opinions expressed here are my own and do
not necessarily represent those of Oracle Corporation."
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days inactive
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6 comments
4 participants
participants (4)
-
Amit Redij -
Devdas Bhagat -
Manish Jethani -
Philip S Tellis