1xl-network-configuration(5)           Xen          xl-network-configuration(5)
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NAME

6       xl-network-configuration - XL Network Configuration Syntax
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SYNTAX

9       This document specifies the xl config file format vif configuration
10       option.  It has the following form:
11
12               vif = [ '<vifspec>', '<vifspec>', ... ]
13
14       where each vifspec is in this form:
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16               [<key>=<value>|<flag>,]
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18       For example:
19
20               'mac=00:16:3E:74:3d:76,model=rtl8139,bridge=xenbr0'
21               'mac=00:16:3E:74:34:32'
22               '' # The empty string
23
24       These might be specified in the domain config file like this:
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26               vif = [ 'mac=00:16:3E:74:34:32', 'mac=00:16:3e:5f:48:e4,bridge=xenbr1' ]
27
28       More formally, the string is a series of comma-separated keyword/value
29       pairs. All keywords are optional.
30
31       Each device has a "DEVID" which is its index within the vif list,
32       starting from 0.
33

Keywords

35   mac
36       If specified then this option specifies the MAC address inside the
37       guest of this VIF device. The value is a 48-bit number represented as
38       six groups of two hexadecimal digits, separated by colons (:).
39
40       The default if this keyword is not specified is to be automatically
41       generate a MAC address inside the space assigned to Xen's
42       Organizationally Unique Identifier
43       <http://en.wikipedia.org/wiki/Organizationally_Unique_Identifier>
44       (00:16:3e).
45
46       If you are choosing a MAC address then it is strongly recommend to
47       follow one of the following strategies:
48
49       ·   Generate a random sequence of 6 byte, set the locally administered
50           bit (bit 2 of the first byte) and clear the multicast bit (bit 1 of
51           the first byte). In other words the first byte should have the bit
52           pattern xxxxxx10 (where x is a randomly generated bit) and the
53           remaining 5 bytes are randomly generated See
54           [http://en.wikipedia.org/wiki/MAC_address] for more details the
55           structure of a MAC address.
56
57       ·   Allocate an address from within the space defined by your
58           organization's OUI (if you have one) following your organization's
59           procedures for doing so.
60
61       ·   Allocate an address from within the space defined by Xen's OUI
62           (00:16:3e). Taking care not to clash with other users of the
63           physical network segment where this VIF will reside.
64
65       If you have an OUI for your own use then that is the preferred
66       strategy. Otherwise in general you should prefer to generate a random
67       MAC and set the locally administered bit since this allows for more
68       bits of randomness than using the Xen OUI.
69
70   bridge
71       Specifies the name of the network bridge which this VIF should be added
72       to. The default is "xenbr0". The bridge must be configured using your
73       distribution's network configuration tools. See the wiki
74       <http://wiki.xen.org/wiki/HostConfiguration/Networking> for guidance
75       and examples.
76
77   gatewaydev
78       Specifies the name of the network interface which has an IP and which
79       is in the network the VIF should communicate with. This is used in the
80       host by the vif-route hotplug script. See wiki
81       <http://wiki.xen.org/wiki/Vif-route> for guidance and examples.
82
83       NOTE: netdev is a deprecated alias of this option.
84
85   type
86       This keyword is valid for HVM guests only.
87
88       Specifies the type of device to valid values are:
89
90       ·   "ioemu" (default) -- this device will be provided as an emulate
91           device to the guest and also as a paravirtualised device which the
92           guest may choose to use instead if it has suitable drivers
93           available.
94
95       ·   "vif" -- this device will be provided as a paravirtualised device
96           only.
97
98   model
99       This keyword is valid for HVM guest devices with "type=ioemu" only.
100
101       Specifies the type device to emulated for this guest. Valid values are:
102
103       ·   "rtl8139" (default) -- Realtek RTL8139
104
105       ·   "e1000" -- Intel E1000
106
107       ·   in principle any device supported by your device model
108
109   vifname
110       Specifies the backend device name for the virtual device.
111
112       If the domain is an HVM domain then the associated emulated (tap)
113       device will have a "-emu" suffice added.
114
115       The default name for the virtual device is "vifDOMID.DEVID" where
116       "DOMID" is the guest domain ID and "DEVID" is the device number.
117       Likewise the default tap name is "vifDOMID.DEVID-emu".
118
119   script
120       Specifies the hotplug script to run to configure this device (e.g. to
121       add it to the relevant bridge). Defaults to "XEN_SCRIPT_DIR/vif-bridge"
122       but can be set to any script. Some example scripts are installed in
123       "XEN_SCRIPT_DIR".
124
125   ip
126       Specifies the IP address for the device, the default is not to specify
127       an IP address.
128
129       What, if any, effect this has depends on the hotplug script which is
130       configured. A typically behaviour (exhibited by the example hotplug
131       scripts) if set might be to configure firewall rules to allow only the
132       specified IP address to be used by the guest (blocking all others).
133
134   backend
135       Specifies the backend domain which this device should attach to. This
136       defaults to domain 0.  Specifying another domain requires setting up a
137       driver domain which is outside the scope of this document.
138
139   rate
140       Specifies the rate at which the outgoing traffic will be limited to.
141       The default if this keyword is not specified is unlimited.
142
143       The rate may be specified as "/s" or optionally "/s@".
144
145       ·   "RATE" is in bytes and can accept suffixes:
146
147           ·   GB, MB, KB, B for bytes.
148
149           ·   Gb, Mb, Kb, b for bits.
150
151       ·   "INTERVAL" is in microseconds and can accept suffixes: ms, us, s.
152           It determines the frequency at which the vif transmission credit is
153           replenished. The default is 50ms.
154
155       Vif rate limiting is credit-based. It means that for "1MB/s@20ms", the
156       available credit will be equivalent of the traffic you would have done
157       at "1MB/s" during 20ms. This will results in a credit of 20,000 bytes
158       replenished every 20,000 us.
159
160       For example:
161
162               'rate=10Mb/s' -- meaning up to 10 megabits every second
163               'rate=250KB/s' -- meaning up to 250 kilobytes every second
164               'rate=1MB/s@20ms' -- meaning 20,000 bytes in every 20 millisecond period
165
166       NOTE: The actual underlying limits of rate limiting are dependent on
167       the underlying netback implementation.
168
169   devid
170       Specifies the devid manually instead of letting xl choose the lowest
171       index available.
172
173       NOTE: This should not be set unless you have a reason to.
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1774.12.1                            2019-12-11       xl-network-configuration(5)
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