[Buildroot] how to restart network interface automatically

[Buildroot] how to restart network interface automatically

[Sylvain LG]

Hello,

my network interface eth0 is configured to use DHCP.

At boot time, init script S40network starts the network. And if DHCP server
- for any reason - can't answer, no IP will be set for eth0.

What will be the correct strategy to handle this case?

Best regards,

Sylvain
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[Buildroot] how to restart network interface automatically

[Jeremy Rosen]

> 
> Hello,
> 
> 
> my network interface eth0 is configured to use DHCP.
> 
> 
> At boot time, init script S40network starts the network. And if DHCP
> server - for any reason - can't answer, no IP will be set for eth0.
> 
> 
> What will be the correct strategy to handle this case?
> 

IIIRC the problem is in the busybox DHCP which doesn't retry on 
failure by default, 

fortunately this is just a config option for busybox, so if you
do a make busybox-menuconfig you can change that behaviour


run "udhcpc --help" on the target to see what options are 
available

set IFUPDOWN_UDHCPC_CMD_OPTIONS to whatever fits you ned




> 
> Best regards,
> 
> 
> Sylvain
> _______________________________________________
> buildroot mailing list
> buildroot at busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot

[Buildroot] how to restart network interface automatically

[Sagaert Johan]

 
Hi

You can use the -b option in the busybox dhcp option list.
This forks DHCP to the background if the interface was'nt up ut boottime.

I use :

CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -n -b"


Don't forget /etc/network/interfaces :
auto eth0
iface eth0 inet dhcp

Regards Johan



-----Oorspronkelijk bericht-----
Van: buildroot [mailto:buildroot-bounces at busybox.net] Namens Jeremy Rosen
Verzonden: maandag 6 oktober 2014 8:50
Aan: Sylvain LG
CC: buildroot at busybox.net
Onderwerp: Re: [Buildroot] how to restart network interface automatically


> 
> Hello,
> 
> 
> my network interface eth0 is configured to use DHCP.
> 
> 
> At boot time, init script S40network starts the network. And if DHCP 
> server - for any reason - can't answer, no IP will be set for eth0.
> 
> 
> What will be the correct strategy to handle this case?
> 

IIIRC the problem is in the busybox DHCP which doesn't retry on failure by default, 

fortunately this is just a config option for busybox, so if you do a make busybox-menuconfig you can change that behaviour


run "udhcpc --help" on the target to see what options are available

set IFUPDOWN_UDHCPC_CMD_OPTIONS to whatever fits you ned




> 
> Best regards,
> 
> 
> Sylvain
> _______________________________________________
> buildroot mailing list
> buildroot at busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot
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