VPN tun 接口端口已关闭

VPN tun 接口端口已关闭

我在通过 vpn 访问 Cryptully 聊天服务器时遇到问题。我采取了以下措施(S - 服务器端,C - 客户端):

S: python cryptully.py -s -p 1242
S: sudo netstat -autpln | grep 1242
tcp        0      0 0.0.0.0:1242            0.0.0.0:*               LISTEN      4978/python
C: sudo openvpn --config /etc/openvpn/client.ovpn
C: sudo nmap -sS 10.8.0.1 -p 1242
Nmap scan report for 10.8.0.1
Host is up (0.000068s latency).
PORT     STATE  SERVICE
1242/tcp closed unknown

例如,端口号 80 和 22 可以访问:

C: sudo nmap -sS 10.8.0.1 -p 80
Nmap scan report for 10.8.0.1
Host is up (0.000069s latency).
PORT   STATE SERVICE
80/tcp open  http
C: sudo nmap -sS 10.8.0.1 -p 22
Nmap scan report for 10.8.0.1
Host is up (0.000058s latency).
PORT   STATE SERVICE
22/tcp open  ssh

还有来自服务器 iptables 的相关规则:

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
target     prot opt in     out     source               destination
ACCEPT     udp  --  eth0   *       0.0.0.0/0            0.0.0.0/0            state NEW udp dpt:1194
ACCEPT     all  --  tun+   *       0.0.0.0/0            0.0.0.0/0
ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED
ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0
REJECT     all  --  !lo    *       0.0.0.0/0            127.0.0.0/8          reject-with icmp-port-unreachable
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:22
REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-port-unreachable

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
ACCEPT     all  --  tun+   *       0.0.0.0/0            0.0.0.0/0
ACCEPT     all  --  tun+   eth0    0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED
ACCEPT     all  --  eth0   tun+    0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

Chain OUTPUT (policy ACCEPT 981K packets, 1013M bytes)
ACCEPT     all  --  *      tun+    0.0.0.0/0            0.0.0.0/0

另一个端口的测试结果如下:

S: python -m SimpleHTTPServer 8000
C: sudo nmap -sS 10.8.0.1 -p 8000
Host is up (0.000059s latency).
PORT     STATE  SERVICE
8000/tcp closed http-alt
C: sudo nmap -sS 192.168.1.183 -p 8000
Host is up (0.00019s latency).
PORT     STATE    SERVICE
8000/tcp filtered http-alt

即使sudo iptables -F在 tun 接口上的端口仍然关闭之后,eth0 上的端口现在也是打开的。

S: python -m SimpleHTTPServer 8000
C: sudo nmap -sS 10.8.0.1 -p 8000
Host is up (0.000068s latency).
PORT     STATE  SERVICE
8000/tcp closed http-alt
C: sudo nmap -sS 192.168.1.183 -p 8000
Host is up (0.00021s latency).
PORT     STATE SERVICE
8000/tcp open  http-alt

这可能的原因是什么?

答案1

在我的客户端机器上使用相同的掩码关闭 openvpn 服务器后问题就消失了。我只是没有提到它已在我的客户端上执行,抱歉大家 :) 在这种情况下,一些请求会到达正确的目的地,而一些会出错。例如,我可以轻松访问 80 端口上的 nginx,但无法访问其他端口,这很奇怪...但现在问题已经消失,我很高兴 :) 新年快乐!

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