I have an IP address and I want to know what is the server name corresponding to that address. How can I do that?
for example: 10.x.x.x to www. something
Use nslookup [IP] [some DNS server]
For internal networks (like 10.x.x.x), something like this:
> nslookup 10.1.1.10 10.1.1.1
Server: 10.1.1.1
Address: 10.1.1.1#53
10.1.1.10.in-addr.arpa name = my-ip-10.1.1.10.domain.com
Related
I want to access my NextJs dev server running on WSL2 on my local network.
I added port 3000 to firewall rules and tested with telnet and it was not immediately accessible.
After some research I found this document: https://learn.microsoft.com/en-us/windows/wsl/networking
So I ran on my WSL2 instance:
cat /etc/resolv.conf
# This file was automatically generated by WSL. To stop automatic generation of this file, add the following entry to /etc/wsl.conf:
# [network]
# generateResolvConf = false
nameserver 172.23.16.1
I confirmed the WSL2 IP address is correct by pinging from host machine:
ping 172.23.16.1
Pinging 172.23.16.1 with 32 bytes of data:
Reply from 172.23.16.1: bytes=32 time<1ms TTL=128
Reply from 172.23.16.1: bytes=32 time<1ms TTL=128
Reply from 172.23.16.1: bytes=32 time<1ms TTL=128
Reply from 172.23.16.1: bytes=32 time<1ms TTL=128
Then using that IP to run this command on the windows 11 host from an elevated prompt:
netsh interface portproxy add v4tov4 listenport=3000 listenaddress=0.0.0.0 connectport=3000 connectaddress=172.23.16.1
Now I am able to telnet into the windows host on 192.168.0.50:3000 (this is local IP of host) but there is no helo and if I try to access it via web browser I get ERR_EMPTY_RESPONSE
The proxy port appears to be there:
netsh interface portproxy show v4tov4
Listen on ipv4: Connect to ipv4:
Address Port Address Port
--------------- ---------- --------------- ----------
0.0.0.0 3000 172.23.16.1 3000
I tried adding a few more proxy ports
Listen on ipv4: Connect to ipv4:
Address Port Address Port
--------------- ---------- --------------- ----------
0.0.0.0 3000 172.23.16.1 3000
192.168.0.50 3000 172.23.16.1 3000
127.0.0.1 3000 172.23.16.1 3000
Still getting ERR_EMPTY_RESPONSE over the LAN. I can connect via telnet to the port so I'm guessing it's something to do with the WSL2 Ubunto 20.04 installation.
I am not sure why I cant access it. There is no firewall active in WSL2
ufw status
Status: inactive
If I try to access localhost:3000 on host machine it works. If I try to access http://192.169.0.50:3000/ on host machine I get the error so there has to be a binding missing somewhere but I don't know where.
How can I debug this?
The docs seem to be incorrect. ipconfig and the resolv.conf seem to show wrong IP address.
To get the correct IP address I needed to use: wsl hostname -I from powershell
I have neo4j community server edition 3.4.5 and which will be giving me "WebSocket connection to 'ws://localhost:7687/' failed".
I found some solution to work in firefox, chrome, IE but those are temporary solutions which work. but I don't think that just by passing proxy would be a permanent solution.
It is not working if connected to VPN(office network), otherwise working. What could be a reason for this error within an office network? How to resolve this issue.
Any idea or suggestions, Please
There can be several reasons for this issue and I probably need to know more about your setup before I can pin point the problem.
1 check:
Disconnect from the VPN, and open a command prompt (Windows+R then write cmd and press enter)
Use either telnet or putty ( https://www.putty.org/ ) and connect to 127.0.0.1 port 7687:
telnet 127.0.0.1 7687
See if you a response like this:
GET / HTTP/1.0
2 check:
Go to you proxy settings and see if you have a proxy enabled:
Firefox: Preferences/Options > Advanced > Network > Settings
IE: Tools > Options > Connections > Lan Settings
Suggest to turn off your proxy and do the check in check 1 again.
3 check:
Connect to your VPN and do the check 1 part once again
Check for error messages (that you probably would get) and then write in the command prompt:
route print
It should show a line like this:
127.0.0.0 255.0.0.0 On-link 127.0.0.1 xxx
127.0.0.1 255.255.255.255 On-link 127.0.0.1 xxx
127.255.255.255 255.255.255.255 On-link 127.0.0.1 xxx
This ensure that you still have your loop back up and running (probably is ok).
4 check:
Turn off your local firewall with VPN connected (if allowed) and try the check 1 again.
Some firewall rules change connections to "localhost" while connected to a VPN, since the new connection is "corporate" or "public".
If that worked, you need to create a rule in your firewall to allow connection to port 7687 for all addresses, this will fix your problem.
5 check:
Check your neo4j community server to listen to "127.0.0.1" and not "0.0.0.0"
Check your ports open by using netstat
netstat -a -o
It should state something like this
Proto Local Address Foreign Address State PID
TCP 0.0.0.0:7687 machinename:0 LISTENING xxxx
or
TCP 127.0.0.1:7687 machinename:0 LISTENING xxxx
If the server is like the first line, it might be handled by a corporate firewall, but by using the 127.0.0.1 as address it should always be local.
Hopefully that will get you on the way :)
i had same problem, so Let me tell you what i came out with...
the company has a proxy server for all connections, so i change my request from IP to DNS by typing nslookup IP on command prompt terminal.
from: ws://180......:80/socket/test to: ws://mxjuppro22......:80/socket/test
then error gone and now is working like a charm!!!
hope it helps
python3.4.3
How can get ip address?
I try this way:
print(socket.gethostbyname(socket.gethostname()))
but only get 127.0.0.1
how can I get the real ip ??
You could try
socket.getfqdn()
or
socket.gethostbyname(socket.getfqdn())
socket.gethostbyname(socket.gethostname()) returns 127.0.0.1 on machines having the hostname in /etc/hosts as 127.0.0.1
I am working with Unix and I used nslookup on a machine at my college.
I got the following output:
Server: ...
Address: ...#**
Name: (name of the machine)
Address: ...
With the *s replaced with the actual numbers.
Which of these numbers is the IP address and which is the MAC address?
xxx.xxx.xxx.xxx is the IP
xx:xx:xx:xx:xx:xx is the MAC address
What network tool can I use under DOS/windows to find the ip address of a netbios host as easily as is done in Linux?
For example under Linux (ubuntu) I can find the ip address like so:
# nmblookup imac
querying imac on 192.168.1.255
192.168.1.75 imac<00>
Now, this is the IP of the macbook when connected wirelessly
But under windows I can't ping it:
C:\>ping imac
Pinging imac.gateway.2wire.net [192.168.1.68] with 32 bytes of data:
Request timed out.
And the closest tool I could find returns TWO IPs
(it returns the hardwired IP even though it got a different IP by connecting wirelessly
C:\>nslookup imac
Address: 192.168.1.254
Name: imac.gateway.2wire.net
Addresses: 192.168.1.68, 192.168.1.75
Isnt there a windows command to return only the active IP address for the host?
On Windows, you can try
ping -a IP_address (lookup for both DNS name and NetBIOS name)
nslookup IP_address (this command requires you to have an internal DNS server configured)
I like to use ping -a personally.
http://technet.microsoft.com/en-us/library/bb490938.aspx :
Nbtstat.exe -a NETBIOSNAME
Nbtstat.exe -A IP
Come with Windows XP and upward.
nbtstat -a [hostname] -c
This gives IP address of NetBIOS name on Windows