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I have (among other network devices) a RPi

Linux rpi2 4.1.10+ #821 PREEMPT Sat Oct 10 00:12:23 BST 2015 armv6l GNU/Linux

It is connected via WiFi to an access point (like the other devices). A static network configuration works (connection to the AP and TCP/IP traffic).

I now wanted to move it to DHCP by modifying in /etc/network/interfaces the wlan0 stanza from

auto wlan0
iface wlan0 inet static
        address 10.10.10.5
        netmask 255.255.255.0
        gateway 10.10.10.254
        wpa-essid "MYSSID"
        wpa-psk "mypassword"

to 

auto wlan0
iface wlan0 inet dhcp
        wpa-essid "MYSSID"
        wpa-psk "mypassword"

The interface connects to the AP (which is visible though iwconfig) but does not get any IP.

  • No request is visible on the server (which runs dnsmasq so I can se all the logs - which include the ones from other devices).
  • other devices on the same AP get addresses without problems
  • a tcpdump does not show any DHCP requests

What could block the RPi to request an IP address?

Answer (summarizing the answer to the question and my further comments): the lack of a client (which I must have removed when reconfiguring the device many times). Installing isc-dhcp-client fixed the issue.

WoJ
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1 Answers1

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you need to execute /sbin/dhclient wlan0 after connecting in post-up or up script in /etc/network/interfaces and you better allow hotplug for wlan0

Alexey Vesnin
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