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Allowing access to my server's UDP ports when the server is connected to OpenVPN

Cannot get outside VPN (same settings work on Debian)OpenVPN Access Server manual configurationUFW setup for OpenVPN serverFlooded with UDP bad checksum on port 53 (but port is closed and checksum offloaded)ufw and iptables show port open, everything else suggests it's closedCan't connect to OpenVPN Access Server using Network Manager configurationHow to auto ban an IP when he access some ports?VPS, VPN and traffic forwardingPort forwarding over OpenVPNAllowing access to my server's ports when the server is connected to OpenVPN (Ubuntu Server 18.10)

0

I've recently bought some cheap vps, and would like to open some ports, i already done that on server with ufw. btw I'm connecting to a VPN that allows me to forward ports to my local machine via OpenVPN since my local provder is blocking ports.

OpenVPN works fine on my pc all connected and working but it shows me only TCP ports are open,all UDP ports closed when i connected on VPN, but when i check on some webiste port checker and paste ip of server it tells its open..

i guess it has somehing with iptables or something like that..? Could anyone help me? THANKS

networking vpn iptables openvpn

share|improve this question

asked 2 hours ago

LicikaLicika

1

New contributor

Licika is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry, this is a bit confused, how did you check that UDP port is closed (this is technically not possible like you can do with TCP port with telnet by example). In fact, what do you want to open?
  
  – ob2
  1 hour ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  First of all thanks for answering. i want to host games in ps4 so my plan was to order server setup vpn and have open ports simple as that.. but when i setup everything i saw on ps4 that nat is still not open.. Then i check on my pc with this tool and saw this: TCP: img.techpowerup.org/190403/capture094-20190404.jpg and UDP: img.techpowerup.org/190403/capture095-20190404.jpg
  
  – Licika
  1 hour ago
  
  

  
  
  
  

add a comment | 

0

I've recently bought some cheap vps, and would like to open some ports, i already done that on server with ufw. btw I'm connecting to a VPN that allows me to forward ports to my local machine via OpenVPN since my local provder is blocking ports.

OpenVPN works fine on my pc all connected and working but it shows me only TCP ports are open,all UDP ports closed when i connected on VPN, but when i check on some webiste port checker and paste ip of server it tells its open..

i guess it has somehing with iptables or something like that..? Could anyone help me? THANKS

networking vpn iptables openvpn

share|improve this question

asked 2 hours ago

LicikaLicika

1

New contributor

Licika is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry, this is a bit confused, how did you check that UDP port is closed (this is technically not possible like you can do with TCP port with telnet by example). In fact, what do you want to open?
  
  – ob2
  1 hour ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  First of all thanks for answering. i want to host games in ps4 so my plan was to order server setup vpn and have open ports simple as that.. but when i setup everything i saw on ps4 that nat is still not open.. Then i check on my pc with this tool and saw this: TCP: img.techpowerup.org/190403/capture094-20190404.jpg and UDP: img.techpowerup.org/190403/capture095-20190404.jpg
  
  – Licika
  1 hour ago
  
  

  
  
  
  

add a comment | 

I've recently bought some cheap vps, and would like to open some ports, i already done that on server with ufw. btw I'm connecting to a VPN that allows me to forward ports to my local machine via OpenVPN since my local provder is blocking ports.

OpenVPN works fine on my pc all connected and working but it shows me only TCP ports are open,all UDP ports closed when i connected on VPN, but when i check on some webiste port checker and paste ip of server it tells its open..

i guess it has somehing with iptables or something like that..? Could anyone help me? THANKS

networking vpn iptables openvpn

share|improve this question

asked 2 hours ago

LicikaLicika

1

New contributor

Licika is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 2 hours ago

LicikaLicika

1

New contributor

Licika is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 2 hours ago

LicikaLicika

1

New contributor

Licika is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 2 hours ago

LicikaLicika

1

New contributor

Licika is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 2 hours ago

LicikaLicika

1

1 Answer
1

active

oldest

votes

0

If I understood what you are trying to achieve, you are try to do NAT from a VPS and forward TCP and UDP port to a local network reachable through a VPN tunnel (OpenVPN). This is probably not working due a routeback issue, your local network is probably configured to reach internet without using OpenVPN connection, so traffic coming from your NAT will not answering to your VPS.

What you can try is proxying your traffic over a service (like nginx). Here an example.

Install Nginx (on your VPS):

apt install nginx

Create a new folder dedicated for your port rules

mkdir /etc/nginx/ports/

Add the following lines to the end of the file /etc/nginx/nginx.conf

stream 
 include /etc/nginx/ports/*;

Finally create any file you want with your rules, into this new folder. Here an example of tcp and udp redirect.

server 
 listen 1234;
 proxy_pass <computer-ip>:1234;


server 
 listen 1234 udp;
 proxy_pass <computer-ip>:1234;


Of course, port 1234 must be opened in your ufw as your mentioned.

share|improve this answer

answered 1 hour ago

ob2ob2

2,004810

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Im gonna try this right now and i will update results
  
  – Licika
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I still didnt get it working, have i done something wrong?? UFW: img.techpowerup.org/190403/capture096-20190404.jpg img.techpowerup.org/190403/capture097-20190404.jpg
  
  – Licika
  52 mins ago
  
  

  
  
  
  

add a comment | 

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0

If I understood what you are trying to achieve, you are try to do NAT from a VPS and forward TCP and UDP port to a local network reachable through a VPN tunnel (OpenVPN). This is probably not working due a routeback issue, your local network is probably configured to reach internet without using OpenVPN connection, so traffic coming from your NAT will not answering to your VPS.

What you can try is proxying your traffic over a service (like nginx). Here an example.

Install Nginx (on your VPS):

apt install nginx

Create a new folder dedicated for your port rules

mkdir /etc/nginx/ports/

Add the following lines to the end of the file /etc/nginx/nginx.conf

stream 
 include /etc/nginx/ports/*;

Finally create any file you want with your rules, into this new folder. Here an example of tcp and udp redirect.

server 
 listen 1234;
 proxy_pass <computer-ip>:1234;


server 
 listen 1234 udp;
 proxy_pass <computer-ip>:1234;


Of course, port 1234 must be opened in your ufw as your mentioned.

share|improve this answer

answered 1 hour ago

ob2ob2

2,004810

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Im gonna try this right now and i will update results
  
  – Licika
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I still didnt get it working, have i done something wrong?? UFW: img.techpowerup.org/190403/capture096-20190404.jpg img.techpowerup.org/190403/capture097-20190404.jpg
  
  – Licika
  52 mins ago
  
  

  
  
  
  

add a comment | 

0

If I understood what you are trying to achieve, you are try to do NAT from a VPS and forward TCP and UDP port to a local network reachable through a VPN tunnel (OpenVPN). This is probably not working due a routeback issue, your local network is probably configured to reach internet without using OpenVPN connection, so traffic coming from your NAT will not answering to your VPS.

What you can try is proxying your traffic over a service (like nginx). Here an example.

Install Nginx (on your VPS):

apt install nginx

Create a new folder dedicated for your port rules

mkdir /etc/nginx/ports/

Add the following lines to the end of the file /etc/nginx/nginx.conf

stream 
 include /etc/nginx/ports/*;

Finally create any file you want with your rules, into this new folder. Here an example of tcp and udp redirect.

server 
 listen 1234;
 proxy_pass <computer-ip>:1234;


server 
 listen 1234 udp;
 proxy_pass <computer-ip>:1234;


Of course, port 1234 must be opened in your ufw as your mentioned.

share|improve this answer

answered 1 hour ago

ob2ob2

2,004810

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Im gonna try this right now and i will update results
  
  – Licika
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I still didnt get it working, have i done something wrong?? UFW: img.techpowerup.org/190403/capture096-20190404.jpg img.techpowerup.org/190403/capture097-20190404.jpg
  
  – Licika
  52 mins ago
  
  

  
  
  
  

add a comment | 

If I understood what you are trying to achieve, you are try to do NAT from a VPS and forward TCP and UDP port to a local network reachable through a VPN tunnel (OpenVPN). This is probably not working due a routeback issue, your local network is probably configured to reach internet without using OpenVPN connection, so traffic coming from your NAT will not answering to your VPS.

What you can try is proxying your traffic over a service (like nginx). Here an example.

Install Nginx (on your VPS):

apt install nginx

Create a new folder dedicated for your port rules

mkdir /etc/nginx/ports/

Add the following lines to the end of the file /etc/nginx/nginx.conf

stream 
 include /etc/nginx/ports/*;

Finally create any file you want with your rules, into this new folder. Here an example of tcp and udp redirect.

server 
 listen 1234;
 proxy_pass <computer-ip>:1234;


server 
 listen 1234 udp;
 proxy_pass <computer-ip>:1234;


Of course, port 1234 must be opened in your ufw as your mentioned.

share|improve this answer

answered 1 hour ago

ob2ob2

2,004810

apt install nginx

mkdir /etc/nginx/ports/

stream 
 include /etc/nginx/ports/*;

server 
 listen 1234;
 proxy_pass <computer-ip>:1234;


server 
 listen 1234 udp;
 proxy_pass <computer-ip>:1234;


Of course, port 1234 must be opened in your ufw as your mentioned.

share|improve this answer

answered 1 hour ago

ob2ob2

2,004810

answered 1 hour ago

ob2ob2

2,004810

answered 1 hour ago

ob2ob2

2,004810