I tried searching for my answer on google and then just stackoverflow but clearly I am not using the right keywords.
Problem: I have two windows 10 laptops on my LAN, both wireless connections (if that matters). And the "main" laptop seems to have forgotten the "spare" laptops name. I could two days ago "ping SPARE" and it would work. Today MAIN cannot ping (or tracert) SPARE. And yes I did power down MAIN between the two sessions.
Addition clue: MAIN could not ping the IP of SPARE - until I had SPARE Ping MAIN. and THEN main knew how to ping the IP of spare
Does anyone out there recognize this situation? and can you help a programmer who's in over his head with networking details?
Thanks
Harry
When the computer can ping with the IP it means there is no connections errors between them , the problem is in the DNS server used by the comupters , DNS ( Domain Name System ) is the protocol used to translate the SPARE name to the PC's actual ip address .
You can ping another PC using both
host name and
ipaddress.
If you can not ping using both then please see solution provided by me on this link of stackoverflow.
However if you can ping using IP address but not by host name then there are other options to try as well like
create entry in host file (most common location of this file is C:\Windows\System32\drivers\etc\hosts)
execute command ipconfig /flushdns and ipconfig /registerdns on HP8 pc
Related
I have a bit of a bizarre problem. I have a Hyper-V VM and I cannot connect to it via IP address on the host computer.
I intend to use it as an SQL server to host a database for a website while I test it, and the first step I can see in this endeavour is to make sure the IP addresses work externally.
Other PCs on the LAN appear to be able to connect just fine via the IP address on Remote Desktop. I cannot do so. I also cannot connect through SQL Management Studio (named pipes or TCP/IP). Although named pipes gives an error relating to being denied access as opposed to IPs which are just not found.
I have tried pinging both ways:
VM => Host : Always gives a "Destination Host Unreachable" error
Host => VM: Always gives a "Request Timed Out" error
As for netstat -a -n, I can see that the VM is listening to 3389 (default Hyper V port, which makes sense).
Regarding Firewalls, all have been turned off on all machines. I can tell that the firewall is not the issue.
If you need any more information to help me to diagnose and treat the problem, please ask me as I would like to get this sorted as quickly as possible.
Thanks a lot in advance.
Which windows server version do you use?
Windows Server 2016 blocks insecure RDP connections (https://support.microsoft.com/en-us/help/4295591/credssp-encryption-oracle-remediation-error-when-to-rdp-to-azure-vm).
Since RDP uses CredSSP you have to install the current Windows Patches.
Do you can ping the DNS server by IP address from your VM?
Is ICMP (ICMP = the thing you need for ping) on your host enabled?
Here is a Checklist for ICMP:
https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc749323(v=ws.10)
Solved,
Just switched to another physical computer and it was fine.
i have 'LAMP' server in my 'ubuntu' 15.10 OS.my local network ip like 192.168.1.25
(my computer = like eg:http://192.168.1.25/test.php out="hello"; .but from
another computer different network enter above address 'not found')
my question is how to open my localhost webpages on another computer from different networks over internet.
Any body help to solve my problem.
Yes it possible.
You have to adjust port forwarding or create VPN connection between you and another computer.
I am running a Windows 8 VM inside of vmware Fusion. It runs inside a Mac running OSX 10.10 (Yosemite). The VM has a computer name of "Proud". When I ping the VM from within itself, i.e. ping -a 192.168.0.138 I get a response like:
Pinging Proud [192.168.0.138] with 32 bytes of data:
Reply from 192.168.0.138: bytes=32 time<1ms TTL=128
However whenever I ping Proud from Yosemite, i.e. ping Proud I get a response like:
PING proud (199.101.28.130): 56 data bytes
64 bytes from 199.101.28.130: icmp_seq=0 ttl=46 time=418.646 ms
The VM is using bridged networking.
Why does Proud resolve to that IP address? It is not correct and means I am unable to use the hostname (a necessity) so that I can connect to it from the Mac.
First, test and check with IP_address typed for ping from OSX 10.10 <host> terminal, so as to be independent of any DNS-service, that is responsible for a hostname translation of your <hostname> to a pre-configured IP_adress
Second, You say bridged -- thus check, that the VM has the very same network-part of the IP_address ( boundary is given by non-zero bits in subnet-mask
Check details with ifconfig resp. ipconfig
-------------------------|-----------------------------|||--------|||.|||.|||.|||
VM/w8 connected to VMnet? has IP_address := 192.168.0.??? subnet ???.???.???.???
RM/OSX connected to VMnet? has IP_address := 192.168.0.??? subnet ???.???.???.???
EDIT#12014-08-20 15:30 [UTC+0000]:
-------------------------?-----------------------------???--------255.255.255.0
-------------------------|-----------------------------|||
Best to post PrintScreens from {OSX|w8} terminals {ping|ipconfig|ifconfig} and the setup of VMnet
This seems to be a 'feature' of Mac OS. If I attempt to ping any hostname it will return the ping from this IP address - even if the hostname is fictional. I do not know why OS X does this.
This is called DNS hijacking and is done by a lot of ISPs out there to redirect you on incomplete or wrong browser address inputs and show you these custom pages with advertisment 'Hey, we couldn't find your webpage Aple.com but maybe you look for Apple.com?'
Maybe this is whats happening here. Btw, ISPs break RFCs here.
You need to check on your own /etc/host file. See if you might have done any changes to this file, to indicate the machine "Proud" comes as 192.168.0.138 or x.x.x.130? Next thing to ensure (user3666197 is actually right), you need to check on ifconfig to check if you have any connection have the IP address pointing to x.x.x.130 or x.x.x.138.
Last but not least, is there any virtual appliance or instance running of "proud" which might have caused confusion as it is possible for any virtual appliance or instance to get a IP address from the same segment as well, hence having "two" machines on the network?
Hope this helps. Check on your WINS config too...
I am trying to share the internet with the Beaglebone Black from my laptop. Here is what I tried till now-
I connected Beaglebone Black to my laptop running Windows 8 via USB cable. Then, I went to network and sharing center. Then, the network which I want to share, I shared it with the Beaglebone(It says Local Area Connection). Now, I went to the Gate one SSH on Beaglebone and wrote - "ping www.google.com". But it said "Unknown Host".
Now, since the above didn't work, I connected the Beaglebone Black with the standard ethernet cable and again tried sharing my network, but it still didn't work.
Here is what I am trying to do-
If I am able to connect to internet, I want to set up VNC server and through that I want to load the GUI of linux on my laptop.
Any help will be greatly appreciated. If there is any other method to accomplish this, please tell me about it. I have tried most of the tutorials on the internet, but didn't succeed.
Here is the detailed answer, after long long waiting I finally figured out how to share internet on BBB. This question is being seen at least 10 times everyday so I though I should answer it by my own. (Also SO gave me Popular question badge for this!)
First thing I tried was:
I connected the BBB(running angstrom) to laptop (running windows 8). The laptop recognized the device and I was able to SSH it through putty.
Now, I tried to ping my computer back whose IP address is 192.168.7.1 .. This step never worked for me, my BBB was never able to ping my computer back but, I was able to ping the beaglebone itself through the provided IP that is 192.168.7.2 (which is obvious)
I searched everywhere on internet and did everything to overcome this glitch such as:
I made the default gateway in BBB to 192.168.7.1
/sbin/route add default gw 192.168.7.1
but that also didn't worked.
I previously thought that it is necessary for me to ping 192.168.7.1 in order to get the internet on BBB.
Since nothing was working I decided to skip this step.
I simply connected the BBB, and then went to network and sharing center in windows 8 and from there, I shared the internet connection from my wifi connection to the beaglebone.
As you will do this, you will see that BB will loose its connection from the putty (if you started putty before network sharing), This is because computer assigns an IP to the BB which you have to change to 'Obtain the IP automatially'
To do this right click and go to properties of the BB connection and then from the list select the IPV4 tcp/IP and go to its properties. In that, you will see the option 'Obtain IP automatically'
Now again start putty (as previous connection will get terminated) and you will see that BB is able to connect.
Now simply add the default gateway as I showed above and then you will be able to ping 8.8.8.8 or any other IP address. Now, simply add the nameserver like this:
cd /etc
more resolv.conf
nano resolv.conf
and add this line below nameserver 127.0.0.1
nameserver 8.8.8.8
and save it, you will be able to ping google.com.
Now comes the VNC server part. For that case also I was wrong. To connect to VNC server you do not need internet connection on the BBB. Yes, you will need that for installing the VNC server on it but not afterwards. Once it is installed, you have to simple do this in BB:
x11vnc -bg -o %HOME/.x11vnc.log.%VNCDISPLAY -auth /var/run/gdm/auth-for-gdm*/database -display :0 -forever
and press enter and BB will reply with VNC started at port 5900
Thats it, now comeback to windows and start VNC server, add the address 192.168.7.2 and you can see the GUI on the screen. I am also able surf internet on the beaglebone.
Thank you for the support and if I am wrong here in my question then please notify me.
Also if you have any doubt, refer to this awesome video my derek molloy: He has explained it very well and remember to skip the step of pinging back 192.168.7.1 if it is not working.
I have not yet figured it out. I will edit the answer once I get it.
1) On your Beaglebone:
sudo su
ifconfig usb0 192.168.7.2
route add default gw 192.168.7.1
2) Now share the network and make sure your pc's ip is 192.168.7.1 after you do
connect beaglebone black to router via ethernet
now use
adb tcpip 5555
adb connect bbb_ip:5555 then use adb shell
The problem you're facing is of resolving nameservers. If you're able to access the device through SSH (using PuTTy, for example), then you can provide it internet too- but the device needs to know where to look for.
The BeagleBone Black has a utility called Connman that manages its connections.
/usr/lib/connman/test has functions related to it.
Use ./set-ipv4-method in there to set different values. Be sure to set the nameservers right. If in doubt, use 8.8.8.8 as the only entry. Also note that the gateway for your BeagleBone must be your computer.
If you're not a newbie and need more detailed instructions, see this.
To continue from the answer provide by Vikas Arora, 3 things you have to do primarily to provide ethernet over usb connection to your Beaglebone. Firstly, share your PC internet connection with the local network made with Beaglebone, a process well explained above. And also setting up the IP address to be obtained automatically.
Secondly, setting up the nameserver to the public DNS server address 8.8.8.8 also explained above. But this setting is not persistent i.e. once you reboot, the settings will be lost. It is because the network manager on Angstrom 'connman' resets the etc/resolv.conf on startup. To correct that I disabled the connman service on my device by going to /lib/systemd/system and
firing commands
systemctl stop connman.service
systemctl disable connman.service
This will make your nameserver file persistent and you can always start connman service again if you need.
Thirdly you have to set your gateway to the address of your internet sharing machine also explained above. But this setting is also not persistent. To do that make a script like below in your home directory
echo "********Setting up the default gateway"
route add default gw 192.168.7.1
and make a service that will kick off on startup and trigger your script. A process well explained at
https://askubuntu.com/questions/506167/how-do-you-save-the-routing-table-on-the-beaglebone-blackangstrom
and
http://mattrichardson.com/BeagleBone-System-Services/
I just saw something I never have seen before.
I got a new SIM card from Nextel (communication company). I tried to use it on a 3G modem E3131, where I had a successful case before with VIVO (another communication company). Now it is different, instead to have only an external IP, I'm getting two different IPs.
For example:
When I go to some service like whatismyip.com, I see an IP 200.xxx.xxx.xxx, but when I check it out on ipconfig /all, I see another IP 10.xxx.xxx.xxx.
My problem is I can't connect to my app from another computer because there's no port redirection to internal IP. I must connect to some specific ports.
Does anyone know how to fix this problem?
Thanks in advance!