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Centos 7 Firewalld 更改本地连接的源地址

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Centos 7 Firewalld 更改本地连接的源地址

我的服务器上使用的是 CentOS 7。我有一个应用程序只接受来自本地主机的连接。问题在于，防火墙会将本地连接更改为使用外部地址作为源连接。这会导致应用程序拒绝连接，因为它不是本地的。

在本地主机上监听 4444 端口

 $ nc 127.0.0.1 -l 4444 -v
 Ncat: Version 6.40 ( http://nmap.org/ncat )
 Ncat: Listening on 127.0.0.1:4444

连接到本地主机

 $ nc 127.0.0.1 4444
 hello

监听 nc 实例打印

 Ncat: Connection from external_address.
 Ncat: Connection from external_address:45274.
 hello

以下是受信任区域的防火墙配置，其中 lo 是

$ firewall-cmd --zone=trusted --list-all
trusted (active)
  interfaces: lo
  sources: 
  services: 
  ports: 
  masquerade: no
  forward-ports: 
  icmp-blocks: 
  rich rules:

这是有意为之还是一个错误？有没有什么简单的解决方案可以修复它？

编辑：

IP 地址设置

$ ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:25:90:7d:8a:96 brd ff:ff:ff:ff:ff:ff
    inet 173.234.39.178/29 brd 173.234.39.183 scope global enp2s0
       valid_lft forever preferred_lft forever
    inet 173.234.39.179/16 brd 173.234.255.255 scope global enp2s0
       valid_lft forever preferred_lft forever
    inet 173.234.39.180/16 brd 173.234.255.255 scope global secondary enp2s0
       valid_lft forever preferred_lft forever
    inet6 fe80::225:90ff:fe7d:8a96/64 scope link 
       valid_lft forever preferred_lft forever
3: enp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 00:25:90:7d:8a:97 brd ff:ff:ff:ff:ff:ff
4: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 100
    link/none 
    inet 10.2.0.1 peer 10.2.0.2/32 scope global tun0
       valid_lft forever preferred_lft forever

路由

$ ip route list 
default via 173.234.39.177 dev enp2s0  proto static  metric 100 
10.2.0.0/24 via 10.2.0.2 dev tun0 
10.2.0.2 dev tun0  proto kernel  scope link  src 10.2.0.1 
173.234.0.0/16 dev enp2s0  proto kernel  scope link  src 173.234.39.179  metric 100 
173.234.39.176/29 dev enp2s0  proto kernel  scope link  src 173.234.39.178  metric 100

信任区域的防火墙配置

 $ firewall-cmd --zone=trusted --list-all
trusted (active)
  interfaces: lo
  sources: 
  services: 
  ports: 
  masquerade: no
  forward-ports: 
  icmp-blocks: 
  rich rules:

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