]>
Commit | Line | Data |
---|---|---|
2c8c4ce7 RP |
1 | ========== |
2 | interfaces | |
3 | ========== | |
4 | ||
5 | -------------------------------------------- | |
6 | network interface configuration for ifupdown | |
7 | -------------------------------------------- | |
8 | ||
9 | :Author: Roopa Prabhu <roopa@cumulusnetworks.com> | |
10 | :Date: 2014-02-05 | |
11 | :Copyright: Copyright 2014 Cumulus Networks, Inc. All rights reserved. | |
12 | :Version: 0.1 | |
d486dd0d | 13 | :Manual section: 5 |
2c8c4ce7 RP |
14 | |
15 | DESCRIPTION | |
16 | =========== | |
1e6d7bd7 ST |
17 | By default, ifupdown2.conf sets **/etc/network/interfaces** as the |
18 | network interface configuration file. This file contains information | |
19 | for the **ifup(8)**, **ifdown(8)** and **ifquery(8)** commands. | |
2c8c4ce7 RP |
20 | |
21 | This is where you configure how your system is connected to the network. | |
22 | ||
23 | Lines starting with # are ignored. Note that end-of-line comments are | |
24 | NOT supported, comments must be on a line of their own. | |
25 | ||
26 | A line may be extended across multiple lines by making the last character | |
27 | a backslash. | |
28 | ||
d486dd0d | 29 | The file consists of zero or more "iface", "auto", "allow-" |
2c8c4ce7 RP |
30 | and "source" stanzas. Here is an example:: |
31 | ||
32 | auto lo eth0 | |
33 | allow-hotplug eth1 | |
34 | ||
35 | iface lo inet loopback | |
36 | ||
37 | source /etc/network/interfaces.d/bridges | |
38 | ||
39 | iface eth0 inet static | |
40 | address 192.168.1.1/24 | |
41 | up flush-mail | |
42 | ||
43 | iface eth1 inet dhcp | |
44 | ||
45 | Lines beginning with the word "auto" are used to identify the physical | |
46 | interfaces to be brought up when ifup is run with the -a option. | |
47 | (This option is used by the system boot scripts.) Physical interface names | |
d486dd0d JF |
48 | should follow the word "auto" on the same line. There can be multiple |
49 | "auto" stanzas. | |
2c8c4ce7 | 50 | |
d486dd0d JF |
51 | Lines beginning with "allow-" are used to identify interfaces that |
52 | should be brought up automatically by various subsystems. This may be | |
53 | done using a command such as "ifup --allow=hotplug eth0 eth1", which | |
54 | will only bring up eth0 or eth1 if it is listed in an "allow-hotplug" | |
2c8c4ce7 RP |
55 | line. Note that "allow-auto" and "auto" are synonyms. |
56 | ||
d486dd0d | 57 | Lines beginning with "source" are used to include stanzas from other |
2c8c4ce7 | 58 | files, so configuration can be split into many files. The word "source" |
d486dd0d JF |
59 | is followed by the path of the file to be sourced. Shell wildcards can |
60 | be used. Currently only supports absolute path names. | |
2c8c4ce7 RP |
61 | |
62 | iface is normally given a interface name as its first non-option | |
d486dd0d | 63 | argument. |
2c8c4ce7 RP |
64 | |
65 | The interface name is followed by the name of the address family that the | |
66 | interface uses. This will be "inet" for TCP/IP networking and inet6 for | |
67 | ipv6. Following that is the name of the method used to configure the | |
68 | interface. | |
69 | ||
70 | ifupdown supports iface stanzas without a family or a method. This enables | |
71 | using the same stanza for inet and inet6 family addresses. And the method | |
72 | defaults to "static" | |
73 | ||
74 | Additional interface options/attributes can be given on subsequent lines | |
75 | in the iface stanza. These options come from addon modules. see | |
76 | **ifupdown-addons-interfaces(5)** for these options. | |
77 | ||
78 | example bridge interface with additional attributes listed in the | |
79 | **ifupdown-addons-interfaces(5)** man page:: | |
80 | ||
81 | auto br0 | |
82 | iface br0 | |
83 | address 12.0.0.4/24 | |
84 | address 2000:1000:1000:1000:3::5/128 | |
85 | bridge-ports swp1 swp2 swp3 | |
86 | bridge-stp on | |
87 | ||
88 | ifupdown supports python-mako style templates in the interfaces file. | |
89 | See examples section for details. | |
90 | ||
d486dd0d | 91 | See **/usr/share/doc/ifupdown2/examples/** for **interfaces(5)** |
2c8c4ce7 RP |
92 | file examples and interfaces file generation scripts. |
93 | ||
94 | METHODS | |
95 | ======= | |
96 | Both **inet** and **inet6** address family interfaces can use the following | |
97 | methods (However they are not required): | |
98 | ||
99 | The loopback Method | |
100 | This method may be used to define the loopback interface. | |
101 | ||
102 | The static Method | |
103 | This method may be used to define ethernet interfaces with | |
104 | statically allocated addresses. | |
105 | ||
106 | The dhcp Method | |
107 | This method may be used to obtain an address via DHCP. | |
108 | ||
109 | BUILTIN INTERFACES | |
110 | ================== | |
111 | **iface** sections for some interfaces like physical interfaces or vlan | |
112 | interfaces in dot notation (like eth1.100) are understood by ifupdown. | |
113 | These interfaces do not need an entry in the interfaces file if | |
83e13021 | 114 | they are dependents of other interfaces and don't need any specific |
2c8c4ce7 RP |
115 | configurations like addresses etc. |
116 | ||
117 | EXAMPLES | |
118 | ======== | |
119 | Sample /etc/network/interfaces file:: | |
120 | ||
121 | auto lo | |
122 | iface lo | |
123 | address 192.168.2.0/24 | |
124 | address 2001:dee:eeee:1::4/128 | |
125 | ||
126 | auto eth0 | |
127 | iface eth0 inet dhcp | |
128 | ||
129 | auto eth1 | |
130 | iface eth1 inet manual | |
131 | address 192.168.2.0/24 | |
132 | address 2001:dee:eeee:1::4/128 | |
133 | ||
134 | # source files from a directory /etc/network/interfaces.d | |
135 | source /etc/network/interfaces.d/* | |
136 | ||
137 | # Using mako style templates | |
138 | % for v in [11,12]: | |
139 | auto vlan${v} | |
140 | iface vlan${v} inet static | |
141 | address 10.20.${v}.3/24 | |
142 | % endfor | |
143 | ||
144 | For additional syntax and examples see **ifupdown-addons-interfaces(5)** | |
145 | ||
146 | FILES | |
147 | ===== | |
1e6d7bd7 | 148 | configuration file defined in ifupdown2.conf (default /etc/network/interfaces) |
2c8c4ce7 RP |
149 | |
150 | SEE ALSO | |
151 | ======== | |
152 | ifupdown-addons-interfaces(5), | |
153 | ifup(8), | |
154 | ifquery(8), | |
155 | ifreload(8) |