### Configuration of the firewall running tinc
-> 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
-> ...
->
-> vpn Link encap:Point-to-Point Protocol
-> inet addr:10.20.30.1 P-t-P:10.20.30.1 Mask:255.255.0.0
-> UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 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
-> 10.20.0.0 * 255.255.0.0 U 0 0 0 vpn
-> 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
-> 1234 123K ACCEPT any -- vpn eth0 10.20.0.0/16 10.20.30.0/24
-> 1234 123K ACCEPT any -- eth0 vpn 10.20.30.0/24 10.20.0.0/16
->
-> 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
->
-> 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 -A FORWARD -j ACCEPT -i vpn -o eth0 -s 10.20.0.0/16 -d 10.20.30.0/24
-> iptables -A FORWARD -j ACCEPT -i eth0 -o vpn -s 10.20.30.0/24 -d 10.20.0.0/16
->
-> iptables -t nat -F POSTROUTING
-> iptables -t nat -A POSTROUTING -j MASQUERADE -i eth0 -o ppp0
+ 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
+ ...
+
+ vpn Link encap:Point-to-Point Protocol
+ inet addr:10.20.30.1 P-t-P:10.20.30.1 Mask:255.255.0.0
+ UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 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
+ 10.20.0.0 * 255.255.0.0 U 0 0 0 vpn
+ 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
+ 1234 123K ACCEPT any -- vpn eth0 10.20.0.0/16 10.20.30.0/24
+ 1234 123K ACCEPT any -- eth0 vpn 10.20.30.0/24 10.20.0.0/16
+
+ 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
+
+ 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 -A FORWARD -j ACCEPT -i vpn -o eth0 -s 10.20.0.0/16 -d 10.20.30.0/24
+ iptables -A FORWARD -j ACCEPT -i eth0 -o vpn -s 10.20.30.0/24 -d 10.20.0.0/16
+
+ iptables -t nat -F POSTROUTING
+ iptables -t nat -A POSTROUTING -j MASQUERADE -i eth0 -o ppp0
### Configuration of tinc
-> firewall# cat /etc/tinc/vpn/tinc.conf
-> Name = office
-> ConnectTo = branch
-> Interface = vpn
->
-> firewall# cat /etc/tinc/vpn/tinc-up
-> #!/bin/sh
->
-> ifconfig $INTERFACE 10.20.30.1 netmask 255.255.0.0
->
-> firewall# ls /etc/tinc/vpn/hosts
-> office branch employee_smith employee_jones ...
->
-> firewall# cat /etc/tinc/vpn/hosts/office
-> Address = 123.234.123.1
-> Subnet = 10.20.30.0/24
-> -----BEGIN RSA PUBLIC KEY-----
-> ...
-> -----END RSA PUBLIC KEY-----
->
-> firewall# cat /etc/tinc/vpn/hosts/branch
-> Address = 123.234.213.129
-> Subnet = 10.20.40.0/24
-> -----BEGIN RSA PUBLIC KEY-----
-> ...
-> -----END RSA PUBLIC KEY-----
->
-> firewall# cat /etc/tinc/vpn/hosts/employee_smith
-> Address = 200.201.202.203
-> Subnet = 10.20.50.1/32
-> -----BEGIN RSA PUBLIC KEY-----
-> ...
-> -----END RSA PUBLIC KEY-----
+ firewall# cat /etc/tinc/vpn/tinc.conf
+ Name = office
+ ConnectTo = branch
+ Interface = vpn
+
+ firewall# cat /etc/tinc/vpn/tinc-up
+ #!/bin/sh
+
+ ifconfig $INTERFACE 10.20.30.1 netmask 255.255.0.0
+
+ firewall# ls /etc/tinc/vpn/hosts
+ office branch employee_smith employee_jones ...
+
+ firewall# cat /etc/tinc/vpn/hosts/office
+ Address = 123.234.123.1
+ Subnet = 10.20.30.0/24
+ -----BEGIN RSA PUBLIC KEY-----
+ ...
+ -----END RSA PUBLIC KEY-----
+
+ firewall# cat /etc/tinc/vpn/hosts/branch
+ Address = 123.234.213.129
+ Subnet = 10.20.40.0/24
+ -----BEGIN RSA PUBLIC KEY-----
+ ...
+ -----END RSA PUBLIC KEY-----
+
+ firewall# cat /etc/tinc/vpn/hosts/employee_smith
+ Address = 200.201.202.203
+ Subnet = 10.20.50.1/32
+ -----BEGIN RSA PUBLIC KEY-----
+ ...
+ -----END RSA PUBLIC KEY-----
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