Networking :: Ping And Telnet In Rhel5?
Feb 3, 2011
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 ??
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Nov 25, 2010
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.
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May 20, 2011
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.
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Nov 27, 2010
I have 2 ethernet cards but when I look at the Network configuration in "Hardware Tab" I have another acx wireless network. How to delete that because In my system Idon't have wireless card..probably installed before but want delete it now.
[code]...
then windows can ping server and resolve ip address and browsing Internet but can't ping [URL]... result is Request time out. ICMP already enabled in iptables.
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Jul 15, 2011
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.
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Jun 13, 2011
I 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.
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Mar 17, 2010
We've recently created 3 new RHEL5 servers and added them to the existing workgroup which all our other 7 RHEL4 servers run on. (All servers have been added into DNS). We seem to be having a few issues pinging 3 of the RHEL5 servers.
Below is an example of our ping tests:
WinsSrv1: Can ping all but RHELSrv1
WinsSrv2: Can ping all REHL Servers
WinsSrv3: Can ping all but RHELSrv2
WinsSrv4: Can ping all but RHELSrv2 & RHELSrv4
WinsSrv5: Can ping all RHEL Servers
There is no real pattern as to what server we can ping. We can ping all RHEL4 servers with no issues. All REHL5 servers can ping themselves with no issues.
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Feb 18, 2010
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?)
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Jul 9, 2010
Ive 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?
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Jul 24, 2010
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.
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Feb 1, 2011
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:
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Apr 29, 2010
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.
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May 26, 2010
I 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.
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May 21, 2009
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.
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Apr 23, 2010
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 ?
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Jan 19, 2010
Host - Fedora 12 64bit
KVM
VM - Windows Server 2008 64 bit
bridge-utils
VM can ping host and Internet but host can't ping VM.
I set VM static IP 192.168.0.205.
It turns out dynamic IP - 192.168.0.55
On host:
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Jan 12, 2011
I have some APC UPS devices that I'm trying to log in to. They are currently configured to use telnet -- as a safety precaution, they can only be accessed from our 'bounce' machine. So because I want to do this from a script, I'm doing it like this ssh decoherence@bouncemachine telnet stupidAPCdevice
This works fine on all the other devices I'm trying this on (Cisco gear, mostly) but the APC won't take any input. I get the login prompt but when I type in my username, ssh echoes it but the APC doesn't appear to ever receive it. It just hangs there at the username prompt. I'm guessing that its telnet implementation is a bit weird (seriously, all the management stuff on APC gear really sucks but anyway
Anyway, I'm just wondering if there are any simple flags I can pass to telnet to make it cooperate. The man page talks about a 'mode' command that lets you fiddle with LINEMODE which sounds like it might be promising but I don't know how to set that in the command line as opposed to interactively.
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Sep 1, 2010
how to use telnet command
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Dec 26, 2010
install telnet in fedora 14 then how to configure telnet?
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Mar 2, 2010
I have Ubuntu 9.10 hooked up to my router through a wired NIC, and a couple of windows machines that are connected to the router through wireless cards.I want to telnet or ssh into the ubuntu box using putty on one of the windows machines. I have attempted to do this using the ubuntu ip address and the name of the box, and neither approaches have worked.
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Nov 30, 2010
I would like to write a small configuration utility that will act as a daemon on the telnet port and SSH port that will only allow access to, and modification of, specific information in a structure imposed by the utility. How do I set this utility up so that when a user opens a telnet connection (or ssh) to the device, they are actually connected to the utility?
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Dec 11, 2010
I have a doubt. If i write for instance the command "telnet myserver.mysite" and I manage to connect to the server, how many TCP connections are established?
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Aug 22, 2010
I am trying to use telnet from linux to connect to the port specified by me and trying to handle control C. But once Ctrl C is pressed the output on the client side stops showing. The server sends data but client doesnt print the same.
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Sep 29, 2009
i want to open specific port using iptables i.e 3159 Whenever i tried to telnet it generates the following error
Code:
# telnet 172.16.4.100 3195
Trying 172.16.4.100...
telnet: connect to address 172.16.4.100: No route to host
telnet: Unable to connect to remote host: No route to host
but when I stopped iptables
Code:
# service iptables stop
Its working fine
i added the ports in iptables i.e.
Code:
#iptables -A INPUT -p tcp --dport 3195 -j ACCEPT
for safe side I also added telnet port
Code:
# iptables -A INPUT -p tcp --dport 23 -j ACCEPT
but result was same.... In short telnet works without iptables but with iptables it generates the error mentioned above
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Jul 21, 2010
Hey even I'm not able to telnet to IPv6 address on port 23
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Jun 8, 2011
I'm running Telnet Server, VFTP, and VNC on a Fedora 14 box. The box's internal IP is 192.168.1.222 This machine is configured to live in the DMZ, The firewall is up on both the router and this box. I can remote in from home using our external IP. I can FTP. I can Telnet. All using our external IP. When i'm in the office, i can remote in using our external IP. I can FTP. I can Telnet. Again, all with the external IP. If i attempt to telnet 192.168.1.222 i get a connection refused. i can ping the 192.168 address
nmap tells me that all 1000 ports on 192.168.1.222 are closed
nmap tells me that my expected ports are open on the external IP.
.... This is a relatively new conundrum as it "used to work", and only appears not to since our last reboot (power outage). I know i have to be missing something simple here, but i differ to the experts.
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Jul 10, 2011
I have a sendmail daemon running on Linux, I can telnet @ port 25 from local shell, however if I telnet from a remote system @ port 25, it doesn't work. There is no firewall in between.
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Dec 16, 2010
Wrong prefix, its Ubuntu not Lubuntu. Three devices:
Laptop 1:
---Can ssh to any device.
---Accepts any internal ssh.
Desktop 1:
---Can ssh to any device.
---Accepts any internal ssh.
Desktop 2:
---Can ssh to any device.
---Can ssh to itself through localhost or 192.168.1.130.
---Any ssh(and telnet) aimed at this device times out.
All three devices recently had openssh-server installed yet only one seems deviant. I've been trying to ssh into desktop 2 to no avail, yes the machine is reachable, yes sshd is running, yes ufw is disabled, and no there is no external firewall that I know of. Anything else I can try? The router for the LAN being dd-wrt.
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Jun 16, 2011
I implemented postfix as mail gateway but i need to block the ability to send
mails via telnet
How can i achive this?
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Sep 16, 2010
I have a customer who is complaining that they can connect to prt y on IP x with telnet. They are seeing the following:
telnet x.x.x.x y
Trying x.x.x.x...
Connected to x.x.x.x.
Escape character is '^]'.
after some time the connection of course times out. Connection closed by foreign host. There is no telnet service running on this port so they cannot do anything, but they are complaining tht the fact that telnet "connects" is a security risk. I am having difficulty explaining why they are able to connect with telnet. I know it has to do with the socket layer API in Linux but I am having difficulty explaining this sufficiently. I also can't just say "this is the way linux works" to them. I am looking through "UNIX Network Programming" by W.
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