When I execute a command (ping or telnet or ssh) on ip 192.168.0.20 it is ok.
If I execute the same command on
ip 192.168.0.020, it looks for
ip 192.168.0.18 instead of
ip 192.168.0.20
And it's the same for others ip if I put a 0 ahead last byte.
I am using an virtual machine. where I need to ping from one machine to another. earlier I was able to ping. But after going to google.com once, I cannot ping back to this machine.
But if I gave ping -I eth1 <IP> then I can ping.
I cannot install any package, so tell me solution which includes not installing any package.
my company there is 1 RHEL5 server and around 50 systems connected to it( running windows ). I want to know who is pinging or telneting to the server how can I find this information on the server OR where should I look for this information in the linux.
if I want to explore on this topic (i.e. who is trying to connect to server, from where user accessing server, whats his/her ip, whats his/her os etc. ) where should I look for it on the net ??
When I ping a destination IP address, it responds. However, when I try to telnet or ftp or sftp to the same IP address, it does not connect.
I do not know the physical location of the machine.
how to use telnet command
View 3 Replies View RelatedIs there a way to execute some command and then after the command completes utomatically reboot the system and then after the system reboots execute another command ? For example look at the sequence shown below(1) Execute command-1(2) After the command-1 in (1) is completed,reboot the system (3) Execute command-2(4) After execution of command-2 reboot the sytemIs there a way i can automate this process so that i need not reboot the system manually
View 5 Replies View RelatedI am setting up Ubuntu to be a firewall type device for a windows computer. (I later want to use Internet sharing or something like that.) The Ubuntu machine has two NICs. The internet NIC works but one light is always orange (even when there is no patch cable connected to it). I can access the Internet fine from the Ubuntu machine. I have a cross over cable connected to the second NIC. This cable connects to the Windows laptop. The windows laptop can ping the Ubuntu machine. But I cannot ping the windows machine from the Ubuntu machine. When I try to telnet to the Ubuntu machine from the Windows machine (over port 23 or 80) it says "cannot connect."
From the Ubuntu machine I issued this command:
# iptables -A INPUT -p tcp --dport 80 -j ACCEPT
I used ufw status and found that the firewall was not enabled on the Ubuntu machine. The default gateway of the second NIC is the IP address of the Windows machine. The default gateway of the Windows machine is the IP address of the Ubuntu machine.
I am trying to find the difference between the above two services. Both are under xinetd and can someone please explain the difference between them (is one more secure than the other one?)
View 1 Replies View RelatedI have linux as my host OS and windows as my guest OS on vmware. is there any possible way to execute linux commands from windows the guest OS? for example create new files, view files, ssh, check processes running... etc.
View 3 Replies View RelatedI am working behind a http proxy (172.30.x.x:3128). I have configured it in my terminal. All the applications such as wget,lynx firefox etc. are working correctly.However all dns utilities like nslookup, host and even ping too are not working.Following is output of host command:
Code:
root@ding:~# host google.com
;; connection timed out; no servers could be reached
Output of host -T:
[Code]....
To connect to net I have to first run dhclient3(learnt from this forum!).It gives me my ip but where is dns address sent I don't have and idea.
If I type
Code:
$ ping [URL]
or even
Code:
$ ping google.com
should I receive a reply?
I have 2 windows PC and a linux as router in the linux there are 2 NIC eth0 and eth1. I created DHCP on eth0 and manually configured on eth1. My eth0 gateway was 192.168.26.253 and my eth1 was 192.168.22.253. I needed to ping the 192.168.26.x WinPC1 to WinPC2. What command I will use on linux so that the WinPC1 can ping to WinPC2.
View 6 Replies View RelatedLet's say I am pinging a host, and want to output to a file each reply and its timestamp of when this started.
I know that it can be done with a loop and a shell script. Something like this
DO
echo "$(date)" >> results.txt ###includes the time and outputs results to txt###
ping -c 4 HOST >> results.txt ###a total of 4 pings at a rate of 1 per second###
REPEAT UNTIL USER PRESSES CTRL-C
Now, my first issue is that I need to be able to see results real-time as well.
Is there a way one can print to BOTH a screen and output? If one uses the ">>" command, it is essentially sending everything to the file. Running another ping command in parallel is not an option.
Is it possible to log into a remote windows computer from my local linux computer and vice-versa using the "telnet" command?
View 2 Replies View RelatedI try to use the "ping -a" command for getting an audible ping. But there is just silence The command "beep" works fine, so everything should be ok with the speaker (in the konsole).
View 3 Replies View RelatedIve got a problem on my server ....installed Debian 5 , Webmin and than syscp settung up syscp ready ....
I try to ping "localhost" ansver ping: unknown host
I try to ping "localhost." there is a host with IP 127.0.0.1
I need it to change it in "localhost"
Is that the bind9 maybe?
Code: cmd='date | wc'
$cmd If this script is executed, an error is generated. The reason written was that "The execution fails because the pipe is not expanded and is passed to date as an argument".What is meant by expansion of pipe. When we execute date | wc on the command line, it goes fine.then | is not treated as an argument. Why?
I have two machines on this network, one running Ubuntu and the other running Fedora.
When I'm using the Wireless network on the Ubuntu machine, I cannot ping the Fedora machine. Everything else works. I can browse the net fine.
If I switch over to the Wired Network then I can ping the other machine.
I don't understand why ping doesn't work only over the Wireless. I can ping the router so I'm guessing it's getting blocked by the router but I didn't block ICMP traffic.
I tried asking on IRC and they ran out of ideas too to find out where the problem is.
I just installed my first EVER bind DNS server. I am running bind9 on Ubuntu 10.04. Everything seems to be working great except one thing: If I ping a host that I have set up in bind by its HOSTNAME the pings take 5-6 seconds to reply/print to the screen between each echo response. If I ping by the host's IP address, they echo back very quickly.
I have read that IPv6 can cause this, but I have disabled it in /etc/sysctl.conf and the problem still exists.
I know everyone says this can't be a DNS issue, but this never was an issue with dnsmasq (which i was using prior), and it doesn't make sense that the ping are ONLY slow when pinging by hostname and not IP.
Configs below:
Ping by hostname - there is a 5-6 second delay between each one of the responses:
Code:
Ping by IP - the responses come VERY quickly one after the other:
Code:
/etc/resolv.conf:
Code:
Code:
rev.0.168.192.in-addr.arpa:
Code:
So, I have an Virtual Machine running CentOS 5.4. It sits behind a hardware firewall which also does NAT'ing. I've set up plenty of these, so I know for sure the firewall and NAT rules are set up correctly. From the host, I can ping anything in my subnet and the gateway. But I can't ping anything else beyond the gateway. I can perform DNS queries and when I try to ping, it finds the appropriate IP address.But from the outside, I can ping the PUBLIC address (It's a 1 public to 1 private address NAT, not 1 public to multiple private). I've tried it with IPTABLES on and off, with no change.
View 11 Replies View RelatedI have Mandriva One 2009.0 (192.168.1.100) on one box and Mandriva Free 2010.0 (192.168.1.118) on the other. I can ping router (192.168.1.1) from both of these boxes but I can't ping one box to the other and the other way around. What's going on?.
Do I have to change some settings in router?. Or is it firewall issue on those two machines?. Both of these boxes are connected by cable. Symbol of the router: TL-WR340G.
I have a big bash script ,its goal is to download movie one by one . But I often get into a problem: if this script is executed in cron,it often does not completely download the movie.I often find the movies it downloaded are several KB while the movie is actually 20MB.So I think it is because it did not wait for finishing one task ,and jump to download another.So I want to know ,is there a way to force the bash script to wait until one movie downloaded completely and then start to download another movie ?
View 8 Replies View RelatedI have a script which builds a project and then runs junit tests. However, if the build fails, the junit tests fail with the same error message.Therefore the command which runs the junit tests should only be executed if the build was successful.
View 3 Replies View RelatedI want to run a command every time I log in to my Ubuntu box, but only if I'm connecting through telnet, not if I'm logging in at the console.
View 1 Replies View RelatedFrom Linux client end I can easily telnet to a remote Linux server easily , Like :
[root@apps1 ~]# telnet 192.168.1.14
Trying 192.168.1.14...
Connected to 192.168.1.14 (192.168.1.14).
Escape character is '^]'.
catalog.aibl.com (Linux release 2.6.18-8.el5 #1 SMP Tue Jun 5 23:25:19 EDT 2007) (1)
login:
But I want to disable the "telnet" command from the client end , so that I cannot telnet to a remote linux server from the Linux client end
On my ubuntu 9.10 pc i am not running a GUI.
Every thing is run from command line.
How do i start a second telnet session from command line.
Plus can i have 4 telnet session open and move from one to the next and back again.
I have a test socket on a server. If I connect to it using telnet, I get exactly the response I expect. So I know the socket works, and the script on the server works:
Code:
my-desktop:~$ telnet 192.168.1.1 3333
Trying 192.168.1.1...
Connected to 192.168.1.1.
Escape character is '^]'.
RAM: 90 % Free ( 2793 M free, 3082 M total)
Connection closed by foreign host. And if I script it, I get almost the same response from Telnet, but still a valid response from the socket. So I know that my script works:
[Code].....
I have connected xp and fedora through crossover cable . xp has ip address 192.168.0.1/24 (manually assigned) fedora has 192.168.0.2/24 with default route equal to 192.168.0.1
I can ping fedora from xp computer but i can't able to ping xp from fedora computer.
I have manully edit the /etc/sysconfig/network-scripts/ifcfg-eth0 file with correct subnet mask and ip address because when i tried to give ip address manully in network manager the subnetmask is replaced with gateway address don't know why.
Now i want to share internet through crossover cable . xp is connected to internet through wireless usb adapeter.
I try to ping with php : exec("ping -n 1 $ip",$output[],$retval); it works fine in window. but in linux i got this error : ping: icmp open socket: Operation not permitted are there any ways to solve this ?
View 5 Replies View RelatedIs it possible to allow a group/user to execute a command, where one of the parameters of the command is a group as well? example that does not work as intended:
Code:
Cmnd_alias SU=/bin/su -l %group1 This example works sortof, it treats the "%group1" literally. I know I can list out the "/bin/su -l <eachuser>", but as you can imagine that is impractical. In this example, I want people in group2(not shown for brevity sake) to be able to su to someone in group1