I have bought a RPI 2 for my 3D printer. My purpose is to access it remotely via wifi. I don't have a router, so I have created an Access Point on the RPI. I have also installed dnsmasq as the DHCP server.

Everything is working... except the DHCP service ! I can connect without any problem to my RPI only if I manually give an IP address to my computer

I have tried lots of different parameters for dnsmasq without success. I have listed my "final" configuration files. Do you have an idea what is wrong ?


auto wlan0
allow-hotplug wlan0
iface wlan inet static




And at the end of the following file, I have added: (not sure that dhcp option 3 and 6 are useful...)



And I have also added (not sure what it is doing):

/etc/hosts main

Thank you ! :)

  • 1
    Hello have you managed to solve your problem?
    – Nemikolh
    Jul 19, 2017 at 10:48

2 Answers 2


I understand that this is most likely a dead post, but I stumbled upon it while looking for an answer to my issue and noticed the following straight off...

The issue appears to be that the OP missed this in the /etc/dnsmasq.conf:


which should have read:

  • Imho that's a simple typo, because OP has other typos such as the interface name wlan instead of wlan0 in the /etc/network/interface config. Jun 25, 2019 at 19:10

All you should need is a single dhcp-range=,,12h line for the range. dnsmasq has a lot of additional options ranges for conditional ranges, but for a simple scenario like you've described, the single line should suffice.

If you're just appending lines to /etc/dnsmasq.conf, make sure there aren't spurious entries above. The default raspbian file has a lot of helpful information, but there's so much in there it's easy to double-up on entries. You might want to create a clean version with only your lines in it.

dhcp-options are specified with dhcp-option lines. I use them to specify default gateway, WINS server, default domain and the like.

Try changing these 3 lines:


into dhcp-options.

# subnet mask
# gateway
# dns
  • Thank you for the explanation and to have pointed out my mistake ! I have tried with the corrected dhcp-option line and without and it is still not working. I have also cleaned the dnsmasq.conf file. On my computer, when I try to connect to the RPI, I'm seeing: DHCP activated / Computer's IP: / Mask: and some IPV6 stuffs. I have also observed that in my /etc/ folder, I have a dhcpcd.conf file which is empty and I think this file is related to the dhcp3 package. May be there is a conflict ? Thank you.
    – Lmecano
    Jul 29, 2015 at 16:25
  • Could it be as simple as dnsmasq not being enabled? Check the /etc/default/dnsmasq file and make sure it reads ENABLED=1.
    – bobstro
    Jul 29, 2015 at 23:09
  • The line is uncommented. I have tried to do sudo /etc/init.d/dnsmasq restart and I got [FAIL] Restarting DNS forwarder and DHCP server: configuration syntax check failed!. I had a look on internet and it is said to check /etc/dnsmasq.conf and /etc/dhcp3/dhclient.conf. Unfortunately, the dhcp3 folder is empty. Do I need to install dhcp3 package ? It seems weird. Thank you.
    – Lmecano
    Jul 30, 2015 at 19:35
  • No, you shouldn't need to install dhcp3. The error indicates a typo somewhere, so at least the problem makes sense. Can you sanitize the file and dump it in a pastebin perhaps? Did you fix those dhcp-range lines?
    – bobstro
    Jul 30, 2015 at 22:36
  • Yeah, I fixed it. Here is my files. pastebin.com/91dMs2zh -> Configuration file of dnsmasq. // pastebin.com/AJth32wa -> Network configuration // pastebin.com/FNF0k81q -> This file is of particular interest as it is telling me that the configuration file has to be in this folder.... I have tried without success. I have also this file: pastebin.com/n83k6Z0P but I don't get it as I didn't install dhcpcd. May be my computer with W8.1 can't connect to a RPI... I will try with another computer as soon as possible.
    – Lmecano
    Jul 31, 2015 at 17:02

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