DHCP IP address is never obtained if powering up without network connected

DHCP IP address is never obtained if powering up without network connected

[Tarek El-Sherbiny]

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Hi,

Starting i.MX6 board without network cable connected then connect the
cable. I expect udhcpc to obtain ip address after the if-up event but it
doesn't.

How do I force udhcpc to obtain IP after detecting if-up event?

-- 
*Tarek*

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Re: DHCP IP address is never obtained if powering up without network connected

[Bob Cochran]

On 02/03/2014 11:12 AM, Tarek El-Sherbiny wrote:
> Hi,
>
> Starting i.MX6 board without network cable connected then connect the
> cable. I expect udhcpc to obtain ip address after the if-up event but it
> doesn't.
>
> How do I force udhcpc to obtain IP after detecting if-up event?

I'm not sure if you mean in your /etc/network/interfaces script or from 
the shell.  Assuming I'm working with eth1:

When I'm debugging dhcp issues from the shell, I run:

dhclient -v eth1

The verbose output is useful in place of a packet sniffer to see info on 
the handshake

In my interfaces script:

auto eth1
iface eth1 inet dhcp

Of course, you'll need to have the right packages installed.  I think 
you want dhcp-client and init-ifupdown



>
> --
> /Tarek/
>
>
> _______________________________________________
> meta-freescale mailing list
> meta-freescale@yoctoproject.org
> https://lists.yoctoproject.org/listinfo/meta-freescale
>

Re: DHCP IP address is never obtained if powering up without network connected

[Tarek El-Sherbiny]

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Hi Bob,

I mean from /etc/network/interfaces. I'm working with eth0

cat /etc/network/interfaces

# The loopback interface
auto lo
iface lo inet loopback

# Wireless interfaces
iface wlan0 inet dhcp
        wireless_mode managed
        wireless_essid any
        wpa-driver wext
        wpa-conf /etc/wpa_supplicant.conf

# Wired interface
 auto eth0
 iface eth0 inet dhcp
# iface eth0 inet static
#   address 192.168.0.50
#   netmask 255.255.255.0
#   gateway 192.168.0.1


I Have dhcp package:
# rpm -qa | grep dhcp
busybox-udhcpc-1.21.1-r0.cortexa9hf_vfp_neon
dhcp-client-4.2.5+P1-r1.cortexa9hf_vfp_neon

And ifupdown:
# rpm -qa | grep ifupdown
init-ifupdown-1.0-r4.cortexa9hf_vfp_neon


dhcp client should obtain ip once I plug-in the cable, right?

On Mon, Feb 3, 2014 at 4:23 PM, Bob Cochran <yocto@mindchasers.com> wrote:

> On 02/03/2014 11:12 AM, Tarek El-Sherbiny wrote:
>
>> Hi,
>>
>> Starting i.MX6 board without network cable connected then connect the
>> cable. I expect udhcpc to obtain ip address after the if-up event but it
>> doesn't.
>>
>> How do I force udhcpc to obtain IP after detecting if-up event?
>>
>
> I'm not sure if you mean in your /etc/network/interfaces script or from
> the shell.  Assuming I'm working with eth1:
>
> When I'm debugging dhcp issues from the shell, I run:
>
> dhclient -v eth1
>
> The verbose output is useful in place of a packet sniffer to see info on
> the handshake
>
> In my interfaces script:
>
> auto eth1
> iface eth1 inet dhcp
>
> Of course, you'll need to have the right packages installed.  I think you
> want dhcp-client and init-ifupdown
>
>
>
>
>> --
>> /Tarek/
>>
>>
>> _______________________________________________
>> meta-freescale mailing list
>> meta-freescale@yoctoproject.org
>> https://lists.yoctoproject.org/listinfo/meta-freescale
>>
>>
>


-- 
*Tarek*

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