Linux Certif

Toute la documentation sur la certification Linux LPI

shorewall-tunnels

NAME

tunnels - Shorewall VPN definition file

SYNOPSIS

/etc/shorewall/tunnels

DESCRIPTION

The tunnels file is used to define rules for encapsulated (usually encrypted) traffic to pass between the Shorewall system and a remote gateway. Traffic flowing through the tunnel is handled using the normal zone/policy/rule mechanism. See http://www.shorewall.net/VPNBasics.html for details.

The columns in the file are as follows.

TYPE --- {ipsec[:noah]|ipsecnat|ipip|gre|pptpclient|pptpserver|{openvpn|openvpnclient|openvpnserver}[:{tcp|udp}][:port]|generic:protocol[:port]}

Types are as follows:

         ipsec         - IPv4 IPSEC
         ipsecnat      - IPv4 IPSEC with NAT Traversal (UDP port 4500 encapsulation)
         ipip          - IPv4 encapsulated in IPv4 (Protocol 4)
         gre           - Generalized Routing Encapsulation (Protocol 47)
         pptpclient    - PPTP Client runs on the firewall
         pptpserver    - PPTP Server runs on the firewall
         openvpn       - OpenVPN in point-to-point mode
         openvpnclient - OpenVPN client runs on the firewall
         openvpnserver - OpenVPN server runs on the firewall
         generic       - Other tunnel type
 

If the type is ipsec, it may be followed by :noah to indicate that the Authentication Headers protocol (51) is not used by the tunnel. NAT traversal is only supported with ESP (protocol 50) so ipsecnat tunnels don't require a noah option (ipsecnat:noah may be specified but is redundant).

If type is openvpn, openvpnclient or openvpnserver it may optionally be followed by ":" and tcp or udp to specify the protocol to be used. If not specified, udp is assumed.

If type is openvpn, openvpnclient or openvpnserver it may optionally be followed by ":" and the port number used by the tunnel. if no ":" and port number are included, then the default port of 1194 will be used. . Where both the protocol and port are specified, the protocol must be given first (e.g., openvpn:tcp:4444).

If type is generic, it must be followed by ":" and a protocol name (from /etc/protocols) or a protocol number. If the protocol is tcp or udp (6 or 17), then it may optionally be followed by ":" and a port number.

ZONE - zone

The zone of the physical interface through which tunnel traffic passes. This is normally your internet zone.

GATEWAY --- address-or-range

The IP address of the remote tunnel gateway. If the remote gateway has no fixed address (Road Warrior) then specify the gateway as 0.0.0.0/0. May be specified as a network address and if your kernel and iptables include iprange match support then IP address ranges are also allowed.

GATEWAY ZONES (Optional) --- [zone[,zone]...]

If the gateway system specified in the third column is a standalone host then this column should contain a comma-separated list of the names of the zones that the host might be in. This column only applies to IPSEC tunnels where it enables ISAKMP traffic to flow through the tunnel to the remote gateway.

EXAMPLE

Example 1:

IPSec tunnel.

The remote gateway is 4.33.99.124 and the remote subnet is 192.168.9.0/24. The tunnel does not use the AH protocol

         #TYPE           ZONE    GATEWAY
         ipsec:noah      net     4.33.99.124
 

Example 2:

Road Warrior (LapTop that may connect from anywhere) where the "gw" zone is used to represent the remote LapTop

         #TYPE           ZONE    GATEWAY         GATEWAY ZONES
         ipsec           net     0.0.0.0/0       gw
 

Example 3:

Host 4.33.99.124 is a standalone system connected via an ipsec tunnel to the firewall system. The host is in zone gw.

         #TYPE           ZONE    GATEWAY         GATEWAY ZONES
         ipsec           net     4.33.99.124     gw
 

Example 4:

Road Warriors that may belong to zones vpn1, vpn2 or vpn3. The FreeS/Wan _updown script will add the host to the appropriate zone using the shorewall add command on connect and will remove the host from the zone at disconnect time.

         #TYPE           ZONE    GATEWAY         GATEWAY ZONES
         ipsec           net     0.0.0.0/0       vpn1,vpn2,vpn3
 

Example 5:

You run the Linux PPTP client on your firewall and connect to server 192.0.2.221.

         #TYPE           ZONE    GATEWAY         GATEWAY ZONES
         pptpclient      net     192.0.2.221
 

Example 6:

You run a PPTP server on your firewall.

         #TYPE           ZONE    GATEWAY         GATEWAY ZONES
         pptpserver      net
 

Example 7:

OPENVPN tunnel. The remote gateway is 4.33.99.124 and openvpn uses port 7777.

         #TYPE           ZONE    GATEWAY         GATEWAY ZONES
         openvpn:7777    net     4.33.99.124
 

Example 8:

You have a tunnel that is not one of the supported types. Your tunnel uses UDP port 4444. The other end of the tunnel is 4.3.99.124.

         #TYPE            ZONE    GATEWAY         GATEWAY ZONES
         generic:udp:4444 net     4.3.99.124
 

FILES

/etc/shorewall/tunnels

SEE ALSO

http://shorewall.net/Documentation.htm#Tunnels

shorewall(8), shorewall-accounting(5), shorewall-actions(5), shorewall-blacklist(5), shorewall-hosts(5), shorewall-interfaces(5), shorewall-ipsec(5), shorewall-maclist(5), shorewall-masq(5), shorewall-nat(5), shorewall-netmap(5), shorewall-params(5), shorewall-policy(5), shorewall-providers(5), shorewall-proxyarp(5), shorewall-route_rules(5), shorewall-routestopped(5), shorewall-rules(5), shorewall.conf(5), shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5), shorewall-tos(5), shorewall-zones(5)