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.. _wwan-interface:
####################
WirelessModem (WWAN)
####################
Configuration
#############
The wirelessmodem interface provides access (through a wireless modem/wwan) to
wireless networks provided by various cellular providers. VyOS uses the
interfaces wirelessmodem subsystem for configuration.
Address
-------
.. cfgcmd:: set interfaces wirelessmodem <interface> apn <apn>
Every WWAN connection requires an :abbr:`APN (Access Point Name)` which is
used by the client to dial into the ISPs network. This is a mandatory
parameter. See the following list of well-known APNs:
- AT&T (isp.cingular)
- Deutsche Telekom (internet.t-d1.de or internet.telekom)
.. cfgcmd:: set interfaces wirelessmodem <interface> backup distance <metric>
Configure metric of the default route added via the Wireless Modem interface.
The default metric if not specified is 10.
.. cfgcmd:: set interfaces wirelessmodem <interface> device <tty>
Device identifier of the underlaying physical interface. This is usually a
ttyUSB device, if not configured this defaults to ttyUSB2.
.. cfgcmd:: set interfaces wirelessmodem <interface> no-peer-dns
Do not install DNS nameservers received from ISP into system wide nameserver
list.
.. cfgcmd:: set interfaces wirelessmodem <interface> ondemand
Enables or disables on-demand WWAN connection.
Use this command to instruct the system to establish a PPP connection
automatically once traffic passes through the interface. A disabled on-demand
connection is established at boot time and remains up. If the link fails for
any reason, the link is brought back up immediately.
Link Administration
-------------------
.. cfgcmd:: set interfaces wirelessmodem <interface> description <description>
Assign given `<description>` to interface. Description will also be passed
to SNMP monitoring systems.
.. cfgcmd:: set interfaces wirelessmodem <interface> disable
Disable given `<interface>`. It will be placed in administratively down
state.
.. cfgcmd:: set interfaces wirelessmodem <interface> mtu <mtu>
Configure :abbr:`MTU (Maximum Transmission Unit)` on given `<interface>`. It
is the size (in bytes) of the largest ethernet frame sent on this link.
Operation
=========
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