tinc 位于偽裝的防火墻后面
示例：偽裝防火墻后面的 tinc
當在偽裝防火墻后面（而不是在防火墻本身上）運行 tinc 時，必須小心配置防火墻，以便允許 tinc 流量通過而不改變源端口和目標端口。此示例中包含示例防火墻規則。它們是為 iptables（Linux 2.4 防火墻代碼）編寫的，但已注釋，以便您可以將相同類型的規則應用于其他防火墻。
示例：偽裝防火墻后面的 tinc
概述
運行 tinc 的主機的配置
tinc 的配置
防火墻配置
概述
網絡設置如下：
內部網絡是 10.20.30.0/24
防火墻IP外部為123.234.123.1，內部為10.20.30.1/24。
運行 tinc 的主機有 IP 10.20.30.42
主機想要連接的 VPN 的地址范圍為 192.168.0.0/16
主機有自己的 VPN IP 192.168.10.20
運行 tinc 的主機的配置
host# ifconfig
eth0 Link encap:Ethernet HWaddr 00:20:30:40:50:60
inet addr:10.20.30.42 Bcast:10.20.30.255 Mask:255.255.255.0
UP BROADCAST RUNNING MTU:1500 Metric:1
...
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:3856 Metric:1
...
vpn Link encap:Point-to-Point Protocol
inet addr:192.168.10.20 P-t-P:192.168.10.20 Mask:255.255.0.0
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
...
host# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.20.30.0 * 255.255.255.0 U 0 0 0 eth0
192.168.0.0 * 255.255.0.0 U 0 0 0 vpn
default 10.20.30.1 0.0.0.0 UG 0 0 0 eth0
host# iptables -L -v
Chain INPUT (policy ACCEPT 1234 packets, 123K bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 2161K packets, 364M bytes)
pkts bytes target prot opt in out source destination
host# iptables -L -v -t nat
Chain PREROUTING (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
tinc 的配置
host# cat /etc/tinc/vpn/tinc.conf
Name = atwork
ConnectTo = home
host# cat /etc/tinc/vpn/tinc-up
#!/bin/sh
ifconfig $INTERFACE 192.168.10.20 netmask 255.255.0.0
host# ls /etc/tinc/vpn/hosts
atwork home
host# cat /etc/tinc/vpn/hosts/atwork
Address = 123.234.123.1
Subnet = 192.168.10.20/32
-----BEGIN RSA PUBLIC KEY-----
...
-----END RSA PUBLIC KEY-----
host# cat /etc/tinc/vpn/hosts/home
Address = 200.201.202.203
Subnet = 192.168.1.0/24
-----BEGIN RSA PUBLIC KEY-----
...
-----END RSA PUBLIC KEY-----
防火墻配置
firewall# ifconfig
ppp0 Link encap:Point-to-Point Protocol
inet addr:123.234.123.1 P-t-P:123.234.120.1 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MTU:1500 Metric:1
...
eth0 Link encap:Ethernet HWaddr 00:20:13:14:15:16
inet addr:10.20.30.1 Bcast:10.20.30.255 Mask:255.255.255.0
UP BROADCAST RUNNING MTU:1500 Metric:1
...
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:3856 Metric:1
...
firewall# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.20.30.0 * 255.255.255.0 U 0 0 0 eth0
default 123.234.120.1 0.0.0.0 UG 0 0 0 ppp0
firewall# iptables -L -v
Chain INPUT (policy ACCEPT 1234 packets, 123K bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy DROP 1234 packets, 123K bytes)
pkts bytes target prot opt in out source destination
1234 123K ACCEPT any -- ppp0 eth0 anywhere 10.20.30.0/24
1234 123K ACCEPT any -- eth0 ppp0 10.20.30.0/24 anywhere
Chain OUTPUT (policy ACCEPT 2161K packets, 364M bytes)
pkts bytes target prot opt in out source destination
firewall# iptables -L -v -t nat
Chain PREROUTING (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
1234 123K DNAT tcp -- ppp0 any anywhere anywhere tcp dpt:655 to:10.20.30.42:655
1234 123K DNAT udp -- ppp0 any anywhere anywhere udp dpt:655 to:10.20.30.42:655
Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
1234 123K MASQUERADE all -- eth0 ppp0 anywhere anywhere
Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
firewall# cat /etc/init.d/firewall
#!/bin/sh
echo 1 >/proc/sys/net/ipv4/ip_forward
iptables -P FORWARD DROP
iptables -F FORWARD
iptables -A FORWARD -j ACCEPT -i ppp0 -o eth0 -d 10.20.30.0/24
iptables -A FORWARD -j ACCEPT -i eth0 -o ppp0 -s 10.20.30.0/24
iptables -t nat -F POSTROUTING
# Next rule prevents masquerading from altering source port of outbound tinc packets
iptables -t nat -A POSTROUTING -p udp -m udp --sport 655 -j MASQUERADE -o ppp0 --to-ports 655
iptables -t nat -A POSTROUTING -j MASQUERADE -o ppp0
iptables -t nat -F PREROUTING
# Next two rules forward incoming tinc packets to the host behind the firewall running tinc
iptables -t nat -A PREROUTING -j DNAT -i ppp0 -p tcp --dport 655 --to 10.20.30.42:655
iptables -t nat -A PREROUTING -j DNAT -i ppp0 -p udp --dport 655 --to 10.20.30.42:655
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