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I am using a BeagleBone and have two network interfaces. One Ethernet interface which will connect locally to another device, and a ppp interface over USB which connects to a cellular modem.

I want the ppp connection to start automatically on boot-up and connect to the modem which I have set up running a script in rc.local. The ppp interface then receives a dynamic IP address from the ISP. This is fine

For the Ethernet interface I would like a static IP address assigned to it , and for it to start automatically also. However, when I set auto eth0 in the /etc/network/interfaces file, the ppp interface then is not available on boot-up automatically as I would like.

What is the problem if I remove the line auto eth0 ? How can I enable both interfaces automatically? Thanks

Below is my /etc/network/interfaces file.

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

#static IP address for eth0
auto eth0
iface eth0 inet static
address 192.168.1.80
netmask 255.255.255.0
gateway 192.168.1.1

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For your first question:

If you remove auto eth0 then your eth0 interface won't start at boot.

If what you've posted is all your /etc/network/interface content where is the ppp connection configuration? Do you have your DNS configured?

FOLLOW-UP

All right. If you have your ppp working that's fine. To set a static IP you may need to have your DNS configured and add the following to your /etc/network/interfaces in addition to what you have already

BROADCAST        192.168.1.255
DNS-NAMESERVERS  8.8.8.8 # Supply here your DNS

I would rather have allow-hotplug instead of auto since the former allows the detection of events after the boot.

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  • That's the thing. I have a separate script which executes the pppd command as given on the modem user manual. When I run the pppd command , then check ifconfig, I see my ppp interface. However i'm not sure if I need to configure this in the network/interfaces file. I'm new to this ppp stuff Commented Jan 30, 2019 at 4:54

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