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iptables 将端口从 ext 网络转发到 int

tag-icon • tag-icon linux debian iptables virtualbox port-forwarding
iptables 将端口从 ext 网络转发到 int

我在 iface eth0 上有 2 个 ip 地址：

eth0      Link encap:Ethernet  HWaddr 00:19:99:a4:14:08  
          inet addr:85.25.152.115  Bcast:85.25.152.255  Mask:255.255.255.0
          inet6 addr: fe80::219:99ff:fea4:1408/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:233866 errors:0 dropped:0 overruns:0 frame:0
          TX packets:145186 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:175800889 (167.6 MiB)  TX bytes:38033903 (36.2 MiB)
          Interrupt:18 

eth0:1    Link encap:Ethernet  HWaddr 00:19:99:a4:14:08  
          inet addr:85.25.248.216  Bcast:85.25.248.255  Mask:255.255.255.192
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:18

我有一个用于 virtualbox guest 的内部虚拟 iface：

tap0      Link encap:Ethernet  HWaddr ae:ba:ce:d7:7d:bd  
          inet addr:10.0.1.1  Bcast:10.255.255.255  Mask:255.0.0.0
          inet6 addr: fe80::acba:ceff:fed7:7dbd/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:111 overruns:0 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

10.0.1.1 是虚拟机 (10.0.1.2) 的网关。从 10.0.1.2 到互联网的转发工作正常，但当我尝试将所有端口从 85.25.248.216 (eth0:1) 重定向到 10.0.1.2 时，它失败了：

iptables -t nat -A PREROUTING -d 85.25.248.216 -j DNAT --to-destination 10.0.1.2
nmap -A -v 85.25.248.216
<...>
PORT      STATE SERVICE VERSION
22/tcp    open  ssh     OpenSSH 5.8p1 Debian 4 (protocol 2.0)
| ssh-hostkey: 1024 4e:3e:ce:86:24:f8:54:7a:68:67:be:57:92:62:00:f0 (DSA)
|_2048 36:f5:0d:4c:1b:58:b8:f9:ff:0f:47:ba:88:43:69:bd (RSA)
10000/tcp open  http    MiniServ 1.540 (Webmin httpd)
|_html-title: Site doesn't have a title (text/html).
Device type: general purpose
Running: Linux 2.6.X
OS details: Linux 2.6.19 - 2.6.31

india827:~# iptables --list -t nat
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         
DNAT       all  --  anywhere             static-ip-85-25-248-216.inaddr.intergenia.de to:10.0.1.2 
DNAT       tcp  --  anywhere             static-ip-85-25-248-216.inaddr.intergenia.de tcp dpt:3389 to:10.0.1.2 

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
DNAT       all  --  anywhere             static-ip-85-25-248-216.inaddr.intergenia.de to:10.0.1.2 

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
MASQUERADE  all  --  anywhere             anywhere            
SNAT       all  --  anywhere             anywhere            to:85.25.248.216

VM 在 Windows 上，至少必须打开 3389 (RDP)，但我（当然！）也无法连接到它。错误在哪里？

新规则：

iptables -t nat -A PREROUTING -d 85.25.248.216 -j DNAT --to-destination 10.0.1.2
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -m conntrack --ctstate NEW -d 10.0.1.2 -j ACCEPT

结果是一样的...

答案1

iptables 命令是正确的，因此它一定是上下文中的某个东西。我会试着猜一下。

未启用 IP 转发。

cat /proc/sys/net/ipv4/ip_forward

应该给出一个值1。如果不是，则将其设置为1经过

echo 1 > /proc/sys/net/ipv4/ip_forward

您正在将 10.0.1.2 通过 SNAT 转为 85.25.152.115

iptables --list -t nat

应该揭示这一点。

答案2

为什么不直接使用 Virtualbox NAT 转发？

http://www.virtualbox.org/manual/ch06.html#natforward

然后只需调整 iptables 以打开主机端口。您已经在 Virtualbox 中运行 NAT 路由器，为什么还要运行两个？

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