openVPN服务器不会通过netcat侦听客户端

我正在为一个客户端（本例中是我的电脑）和服务器（aws服务器）之间build立一个VPN连接的ROS项目。

我使用openVPN创build一个tun0接口，通过它可以使服务器和客户端都能够相互ping通（10.8.0.1是服务器的IP地址，10.8.0.2是客户端的地址）。

但是，作为进一步的testing，我检查了netcat的结果，发现运行：

netcat -l 1234 

在客户端和：

• 允许在openwrt中使用iptables访问特定IP的stream量
• 从哪里获得iptables-extensions的rpm？
• iptables端口转发 – 获取源IP和端口
• 通过ufw和iptables阻止域名
• 如何将docker-container出站stream量分配给特定的NIC

 netcat 10.8.0.2 1234 

在服务器上，我能够发送数据。 而相反的configuration不起作用。

我不明白，如果这是一个特定的问题涉及server.conf openVPN的configuration文件的服务器，或者如果我必须实施某种forms的转发规则。

server.conf文件如下：

 port 1194 proto udp dev tun sndbuf 0 rcvbuf 0 ca ca.crt cert server.crt key server.key dh dh.pem auth SHA512 tls-auth ta.key 0 topology subnet server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt push "redirect-gateway def1 bypass-dhcp" push "dhcp-option DNS 172.31.0.2" keepalive 10 120 cipher AES-256-CBC comp-lzo user nobody group nogroup persist-key persist-tun status openvpn-status.log verb 3 crl-verify crl.pem 

client.conf文件是：

 client dev tun proto udp sndbuf 0 rcvbuf 0 remote 54.229.64.59 1194 resolv-retry infinite nobind persist-key persist-tun remote-cert-tls server auth SHA512 cipher AES-256-CBC comp-lzo setenv opt block-outside-dns key-direction 1 verb 3 

服务器的IP表规则是：

 Chain INPUT (policy DROP) target prot opt source destination ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:1194 ufw-before-logging-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-before-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-after-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-after-logging-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-reject-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-track-input all -- 0.0.0.0/0 0.0.0.0/0 Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT all -- 10.8.0.0/24 0.0.0.0/0 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED ufw-before-logging-forward all -- 0.0.0.0/0 0.0.0.0/0 ufw-before-forward all -- 0.0.0.0/0 0.0.0.0/0 ufw-after-forward all -- 0.0.0.0/0 0.0.0.0/0 ufw-after-logging-forward all -- 0.0.0.0/0 0.0.0.0/0 ufw-reject-forward all -- 0.0.0.0/0 0.0.0.0/0 ufw-track-forward all -- 0.0.0.0/0 0.0.0.0/0 Chain OUTPUT (policy ACCEPT) target prot opt source destination ufw-before-logging-output all -- 0.0.0.0/0 0.0.0.0/0 ufw-before-output all -- 0.0.0.0/0 0.0.0.0/0 ufw-after-output all -- 0.0.0.0/0 0.0.0.0/0 ufw-after-logging-output all -- 0.0.0.0/0 0.0.0.0/0 ufw-reject-output all -- 0.0.0.0/0 0.0.0.0/0 ufw-track-output all -- 0.0.0.0/0 0.0.0.0/0 Chain ufw-after-forward (1 references) target prot opt source destination Chain ufw-after-input (1 references) target prot opt source destination ufw-skip-to-policy-input udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:137 ufw-skip-to-policy-input udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:138 ufw-skip-to-policy-input tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:139 ufw-skip-to-policy-input tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:445 ufw-skip-to-policy-input udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:67 ufw-skip-to-policy-input udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:68 ufw-skip-to-policy-input all -- 0.0.0.0/0 0.0.0.0/0 ADDRTYPE match dst-type BROADCAST Chain ufw-after-logging-forward (1 references) target prot opt source destination Chain ufw-after-logging-input (1 references) target prot opt source destination LOG all -- 0.0.0.0/0 0.0.0.0/0 limit: avg 3/min burst 10 LOG flags 0 level 4 prefix "[UFW BLOCK] " Chain ufw-after-logging-output (1 references) target prot opt source destination Chain ufw-after-output (1 references) target prot opt source destination Chain ufw-before-forward (1 references) target prot opt source destination ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmptype 3 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmptype 4 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmptype 11 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmptype 12 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmptype 8 ufw-user-forward all -- 0.0.0.0/0 0.0.0.0/0 Chain ufw-before-input (1 references) target prot opt source destination ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED ufw-logging-deny all -- 0.0.0.0/0 0.0.0.0/0 ctstate INVALID DROP all -- 0.0.0.0/0 0.0.0.0/0 ctstate INVALID ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmptype 3 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmptype 4 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmptype 11 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmptype 12 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmptype 8 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp spt:67 dpt:68 ufw-not-local all -- 0.0.0.0/0 0.0.0.0/0 ACCEPT udp -- 0.0.0.0/0 224.0.0.251 udp dpt:5353 ACCEPT udp -- 0.0.0.0/0 239.255.255.250 udp dpt:1900 ufw-user-input all -- 0.0.0.0/0 0.0.0.0/0 Chain ufw-before-logging-forward (1 references) target prot opt source destination Chain ufw-before-logging-input (1 references) target prot opt source destination Chain ufw-before-logging-output (1 references) target prot opt source destination Chain ufw-before-output (1 references) target prot opt source destination ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED ufw-user-output all -- 0.0.0.0/0 0.0.0.0/0 Chain ufw-logging-allow (0 references) target prot opt source destination LOG all -- 0.0.0.0/0 0.0.0.0/0 limit: avg 3/min burst 10 LOG flags 0 level 4 prefix "[UFW ALLOW] " Chain ufw-logging-deny (2 references) target prot opt source destination RETURN all -- 0.0.0.0/0 0.0.0.0/0 ctstate INVALID limit: avg 3/min burst 10 LOG all -- 0.0.0.0/0 0.0.0.0/0 limit: avg 3/min burst 10 LOG flags 0 level 4 prefix "[UFW BLOCK] " Chain ufw-not-local (1 references) target prot opt source destination RETURN all -- 0.0.0.0/0 0.0.0.0/0 ADDRTYPE match dst-type LOCAL RETURN all -- 0.0.0.0/0 0.0.0.0/0 ADDRTYPE match dst-type MULTICAST RETURN all -- 0.0.0.0/0 0.0.0.0/0 ADDRTYPE match dst-type BROADCAST ufw-logging-deny all -- 0.0.0.0/0 0.0.0.0/0 limit: avg 3/min burst 10 DROP all -- 0.0.0.0/0 0.0.0.0/0 Chain ufw-reject-forward (1 references) target prot opt source destination Chain ufw-reject-input (1 references) target prot opt source destination Chain ufw-reject-output (1 references) target prot opt source destination Chain ufw-skip-to-policy-forward (0 references) target prot opt source destination ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 Chain ufw-skip-to-policy-input (7 references) target prot opt source destination DROP all -- 0.0.0.0/0 0.0.0.0/0 Chain ufw-skip-to-policy-output (0 references) target prot opt source destination ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 Chain ufw-track-forward (1 references) target prot opt source destination ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 ctstate NEW ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 ctstate NEW Chain ufw-track-input (1 references) target prot opt source destination Chain ufw-track-output (1 references) target prot opt source destination ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 ctstate NEW ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 ctstate NEW Chain ufw-user-forward (1 references) target prot opt source destination Chain ufw-user-input (1 references) target prot opt source destination ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:1194 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 /* 'dapp_OpenSSH' */ Chain ufw-user-limit (0 references) target prot opt source destination LOG all -- 0.0.0.0/0 0.0.0.0/0 limit: avg 3/min burst 5 LOG flags 0 level 4 prefix "[UFW LIMIT BLOCK] " REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable Chain ufw-user-limit-accept (0 references) target prot opt source destination ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 Chain ufw-user-logging-forward (0 references) target prot opt source destination Chain ufw-user-logging-input (0 references) target prot opt source destination Chain ufw-user-logging-output (0 references) target prot opt source destination Chain ufw-user-output (1 references) target prot opt source destination 

PC的IP表格是：

 Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination 

在此先感谢您的帮助。

更新：

我设法通过禁用服务器防火墙运行解决问题：

 ufw disable 

但是，我认为应该更好地实施特定的规则，而不是整个防火墙。