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I am using Ubuntu 16.04 LTS on both my client and server computer. The server is running the OpenSSH-server software and I have no problem connecting to it locally. I cannot, however, connect to it remotely (with public IP).

I have forwarded ports to the server in question and I have disabled Ubuntus firewall. I also tried listening for different ports (1022 and 24444) with forwarding enabled without any success. The same error message keeps on showing: Network is unreachable.

What am I doing wrong?

ifconfig client

wlp2s0    Link encap:Ethernet  HWaddr f4:8c:50:ad:69:93  
      inet addr:192.168.38.107  Bcast:192.168.38.255  Mask:255.255.255.0
      inet6 addr: fe80::98db:f0f5:697f:6efc/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:38317 errors:0 dropped:0 overruns:0 frame:0
      TX packets:28963 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000 
      RX bytes:30213501 (30.2 MB)  TX bytes:5871287 (5.8 MB)

ifconfig server

enp3s0    Link encap:Ethernet  HWaddr 1c:1b:0d:ff:19:35  
      inet addr:192.168.38.176  Bcast:192.168.38.255  Mask:255.255.255.0
      inet6 addr: fe80::bdef:8a38:24ec:7c6/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:425268 errors:0 dropped:0 overruns:0 frame:0
      TX packets:209099 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000 
      RX bytes:160570677 (160.5 MB)  TX bytes:81972815 (81.9 MB)

Server is connected to Jensen 7000AC router via cable and client is connected to same router via Wifi.

Dreuhn
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1 Answers1

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The problem I had was caused by CGN, or carrier-grade NAT used by my ISP. I had to contact my ISP and ask for a public IP in order for it to work.

If you live in Sweden, pretty much every ISP require you to contact them in order for a public server to work.

Dreuhn
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