2 menu "UML Network Devices"
7 bool "Virtual network device"
9 While the User-Mode port cannot directly talk to any physical
10 hardware devices, this choice and the following transport options
11 provide one or more virtual network devices through which the UML
12 kernels can talk to each other, the host, and with the host's help,
13 machines on the outside world.
15 For more information, including explanations of the networking and
16 sample configurations, see
17 <http://user-mode-linux.sourceforge.net/networking.html>.
19 If you'd like to be able to enable networking in the User-Mode
20 linux environment, say Y; otherwise say N. Note that you must
21 enable at least one of the following transport options to actually
22 make use of UML networking.
24 config UML_NET_ETHERTAP
25 bool "Ethertap transport"
28 The Ethertap User-Mode Linux network transport allows a single
29 running UML to exchange packets with its host over one of the
30 host's Ethertap devices, such as /dev/tap0. Additional running
31 UMLs can use additional Ethertap devices, one per running UML.
32 While the UML believes it's on a (multi-device, broadcast) virtual
33 Ethernet network, it's in fact communicating over a point-to-point
36 To use this, your host kernel must have support for Ethertap
37 devices. Also, if your host kernel is 2.4.x, it must have
38 CONFIG_NETLINK_DEV configured as Y or M.
40 For more information, see
41 <http://user-mode-linux.sourceforge.net/networking.html> That site
42 has examples of the UML command line to use to enable Ethertap
45 If you'd like to set up an IP network with the host and/or the
46 outside world, say Y to this, the Daemon Transport and/or the
47 Slip Transport. You'll need at least one of them, but may choose
48 more than one without conflict. If you don't need UML networking,
52 bool "TUN/TAP transport"
55 The UML TUN/TAP network transport allows a UML instance to exchange
56 packets with the host over a TUN/TAP device. This option will only
57 work with a 2.4 host, unless you've applied the TUN/TAP patch to
60 To use this transport, your host kernel must have support for TUN/TAP
61 devices, either built-in or as a module.
67 The slip User-Mode Linux network transport allows a running UML to
68 network with its host over a point-to-point link. Unlike Ethertap,
69 which can carry any Ethernet frame (and hence even non-IP packets),
70 the slip transport can only carry IP packets.
72 To use this, your host must support slip devices.
74 For more information, see
75 <http://user-mode-linux.sourceforge.net/networking.html>. That site
76 has examples of the UML command line to use to enable slip
77 networking, and details of a few quirks with it.
79 The Ethertap Transport is preferred over slip because of its
80 limitations. If you prefer slip, however, say Y here. Otherwise
81 choose the Multicast transport (to network multiple UMLs on
82 multiple hosts), Ethertap (to network with the host and the
83 outside world), and/or the Daemon transport (to network multiple
84 UMLs on a single host). You may choose more than one without
85 conflict. If you don't need UML networking, say N.
88 bool "Daemon transport"
91 This User-Mode Linux network transport allows one or more running
92 UMLs on a single host to communicate with each other, but not to
95 To use this form of networking, you'll need to run the UML
96 networking daemon on the host.
98 For more information, see
99 <http://user-mode-linux.sourceforge.net/networking.html> That site
100 has examples of the UML command line to use to enable Daemon
103 If you'd like to set up a network with other UMLs on a single host,
104 say Y. If you need a network between UMLs on multiple physical
105 hosts, choose the Multicast Transport. To set up a network with
106 the host and/or other IP machines, say Y to the Ethertap or Slip
107 transports. You'll need at least one of them, but may choose
108 more than one without conflict. If you don't need UML networking,
115 This User-Mode Linux network transport allows one or more running
116 UMLs on a single host to communicate with each other and also
117 with the rest of the world using Virtual Distributed Ethernet,
118 an improved fork of uml_switch.
120 You must have libvdeplug installed in order to build the vde
123 To use this form of networking, you will need to run vde_switch
126 For more information, see <http://wiki.virtualsquare.org/>
127 That site has a good overview of what VDE is and also examples
128 of the UML command line to use to enable VDE networking.
130 If you need UML networking with VDE,
134 bool "Multicast transport"
137 This Multicast User-Mode Linux network transport allows multiple
138 UMLs (even ones running on different host machines!) to talk to
139 each other over a virtual ethernet network. However, it requires
140 at least one UML with one of the other transports to act as a
141 bridge if any of them need to be able to talk to their hosts or any
144 To use this, your host kernel(s) must support IP Multicasting.
146 For more information, see
147 <http://user-mode-linux.sourceforge.net/networking.html> That site
148 has examples of the UML command line to use to enable Multicast
149 networking, and notes about the security of this approach.
151 If you need UMLs on multiple physical hosts to communicate as if
152 they shared an Ethernet network, say Y. If you need to communicate
153 with other IP machines, make sure you select one of the other
154 transports (possibly in addition to Multicast; they're not
155 exclusive). If you don't need to network UMLs say N to each of
159 bool "pcap transport"
160 depends on UML_NET && EXPERIMENTAL
162 The pcap transport makes a pcap packet stream on the host look
163 like an ethernet device inside UML. This is useful for making
164 UML act as a network monitor for the host. You must have libcap
165 installed in order to build the pcap transport into UML.
167 For more information, see
168 <http://user-mode-linux.sourceforge.net/networking.html> That site
169 has examples of the UML command line to use to enable this option.
171 If you intend to use UML as a network monitor for the host, say
172 Y here. Otherwise, say N.
175 bool "SLiRP transport"
178 The SLiRP User-Mode Linux network transport allows a running UML
179 to network by invoking a program that can handle SLIP encapsulated
180 packets. This is commonly (but not limited to) the application
181 known as SLiRP, a program that can re-socket IP packets back onto
182 the host on which it is run. Only IP packets are supported,
183 unlike other network transports that can handle all Ethernet
184 frames. In general, slirp allows the UML the same IP connectivity
185 to the outside world that the host user is permitted, and unlike
186 other transports, SLiRP works without the need of root level
187 privleges, setuid binaries, or SLIP devices on the host. This
188 also means not every type of connection is possible, but most
189 situations can be accomodated with carefully crafted slirp
190 commands that can be passed along as part of the network device's
191 setup string. The effect of this transport on the UML is similar
192 that of a host behind a firewall that masquerades all network
193 connections passing through it (but is less secure).
195 To use this you should first have slirp compiled somewhere
196 accessible on the host, and have read its documentation. If you
197 don't need UML networking, say N.
199 Startup example: "eth0=slirp,FE:FD:01:02:03:04,/usr/local/bin/slirp"