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How to auto populate /etc/resolv.conf when using a static configuration



2019 Community Moderator Electionpxe boot: problems with /etc/resolv.confForce usage of DNS server provided by DHCP?Configure multiple interfaces with different hostnames using DHCP and DNSnameservers erased after systemctl restart network.serviceCannot Intentionally break/stop DNS via /etc/resolv.conf - Always resolving no matter NS configCan not set static DNS on debianDhclient not updating /etc/resolv.confNetworkManager-configured dnsmasq failing to forward requestsFreeBSD w/ two network interfaces and different domainsDHCP DNS and Domain resolution NetworkManager










0















I'm on an IoT device running busybox with glibc. When I have a DHCP setup in /etc/network/interfaces then udhcpc atuomatically updates /etc/resolv.conf. I can see this by clearing /etc/resolv.conf and then starting udhcpc.



# udhcpc -i wlan0 --pidfile /tmp/udhpcp.pid
udhcpc: started, v1.26.2
udhcpc: sending discover
udhcpc: sending select for 172.20.53.151
udhcpc: lease of 172.20.53.151 obtained, lease time 46800
deleting routers
SIOCDELRT: No such process
adding dns 172.20.62.208
adding dns 172.20.108.123


However, when I have a static configuration setup in /etc/network/interfaces nothing updates /etc/resolv.conf. When can be done to have have a DNS server automatically added to /etc/resolv.conf when using a static IP configuration? Is this possible? Currently when this modules gets configured with a static IP no DNS hostname or IP is provided. Would it need to be provided if configured using a static IP?



Edit:



To further explain, the device gets its networks settings from an XML configuration file. This file has the four fields:



<NetworkConfig>
 <IP>1.2.3.4</IP>
 <NETMASK>255.255.240.0</NETMASK>
 <GATEWAY>1.2.3.1</GATEWAY>
 <DHCP>0</DHCP>
</NetworkConfig>


A program on the device takes this and generates a /etc/network/interfaces file, creating an entry like so if DHCP=0:



auto wlan0
iface wlan0 inet static
 address 1.2.3.4
 netmask 255.255.240.0
 gateway 1.2.3.1


And an entry like so if DHCP=1



auto wlan0
iface wlan0 inet dhcp


So when trying to configure the device with a static IP, nothing updates /etc/resolv.conf and no DNS info is provided in the XML file. Is there no application which would be able to automatically updated /etc/resolv.conf? How/where does udhcpc get its dns info from?






dns resolv.conf







share|improve this question



















  • 1





    A DHCP server can send the DNS servers' addresses to the client, so it can update /etc/resolv.conf. How do you get the correct configuration into /etc/network/interfaces? In a similar way you have to fill /etc/resolv.conf.

    – Bodo
    12 hours ago











  • Currently the way the module works is an XML file is sent to the module and a program parses that and updates /etc/network/interfaces. That XML file doesn't have any DNS info and my understanding is that it would need to provided this if you're using a static IP configuration.

    – dangeroushobo
    12 hours ago











  • Please edit your question to add more information instead of writing comments. To get help you should describe how your configuration mechanism works. If you use standard tools I suggest to show your scripts, input and output.

    – Bodo
    11 hours ago











  • udhcpc gets its information from the dhcp reply. If you need to not used the dhcp reply information, you'll need to manually input all of its data, including ip address, netmask, gateway, dns servers, ntp servers, etc. It sounds like your XML is not up to the task that it's been given.

    – Doug O'Neal
    10 hours ago















0















I'm on an IoT device running busybox with glibc. When I have a DHCP setup in /etc/network/interfaces then udhcpc atuomatically updates /etc/resolv.conf. I can see this by clearing /etc/resolv.conf and then starting udhcpc.



# udhcpc -i wlan0 --pidfile /tmp/udhpcp.pid
udhcpc: started, v1.26.2
udhcpc: sending discover
udhcpc: sending select for 172.20.53.151
udhcpc: lease of 172.20.53.151 obtained, lease time 46800
deleting routers
SIOCDELRT: No such process
adding dns 172.20.62.208
adding dns 172.20.108.123


However, when I have a static configuration setup in /etc/network/interfaces nothing updates /etc/resolv.conf. When can be done to have have a DNS server automatically added to /etc/resolv.conf when using a static IP configuration? Is this possible? Currently when this modules gets configured with a static IP no DNS hostname or IP is provided. Would it need to be provided if configured using a static IP?



Edit:



To further explain, the device gets its networks settings from an XML configuration file. This file has the four fields:



<NetworkConfig>
 <IP>1.2.3.4</IP>
 <NETMASK>255.255.240.0</NETMASK>
 <GATEWAY>1.2.3.1</GATEWAY>
 <DHCP>0</DHCP>
</NetworkConfig>


A program on the device takes this and generates a /etc/network/interfaces file, creating an entry like so if DHCP=0:



auto wlan0
iface wlan0 inet static
 address 1.2.3.4
 netmask 255.255.240.0
 gateway 1.2.3.1


And an entry like so if DHCP=1



auto wlan0
iface wlan0 inet dhcp


So when trying to configure the device with a static IP, nothing updates /etc/resolv.conf and no DNS info is provided in the XML file. Is there no application which would be able to automatically updated /etc/resolv.conf? How/where does udhcpc get its dns info from?






dns resolv.conf







share|improve this question



















  • 1





    A DHCP server can send the DNS servers' addresses to the client, so it can update /etc/resolv.conf. How do you get the correct configuration into /etc/network/interfaces? In a similar way you have to fill /etc/resolv.conf.

    – Bodo
    12 hours ago











  • Currently the way the module works is an XML file is sent to the module and a program parses that and updates /etc/network/interfaces. That XML file doesn't have any DNS info and my understanding is that it would need to provided this if you're using a static IP configuration.

    – dangeroushobo
    12 hours ago











  • Please edit your question to add more information instead of writing comments. To get help you should describe how your configuration mechanism works. If you use standard tools I suggest to show your scripts, input and output.

    – Bodo
    11 hours ago











  • udhcpc gets its information from the dhcp reply. If you need to not used the dhcp reply information, you'll need to manually input all of its data, including ip address, netmask, gateway, dns servers, ntp servers, etc. It sounds like your XML is not up to the task that it's been given.

    – Doug O'Neal
    10 hours ago













0












0








0


1






I'm on an IoT device running busybox with glibc. When I have a DHCP setup in /etc/network/interfaces then udhcpc atuomatically updates /etc/resolv.conf. I can see this by clearing /etc/resolv.conf and then starting udhcpc.



# udhcpc -i wlan0 --pidfile /tmp/udhpcp.pid
udhcpc: started, v1.26.2
udhcpc: sending discover
udhcpc: sending select for 172.20.53.151
udhcpc: lease of 172.20.53.151 obtained, lease time 46800
deleting routers
SIOCDELRT: No such process
adding dns 172.20.62.208
adding dns 172.20.108.123


However, when I have a static configuration setup in /etc/network/interfaces nothing updates /etc/resolv.conf. When can be done to have have a DNS server automatically added to /etc/resolv.conf when using a static IP configuration? Is this possible? Currently when this modules gets configured with a static IP no DNS hostname or IP is provided. Would it need to be provided if configured using a static IP?



Edit:



To further explain, the device gets its networks settings from an XML configuration file. This file has the four fields:



<NetworkConfig>
 <IP>1.2.3.4</IP>
 <NETMASK>255.255.240.0</NETMASK>
 <GATEWAY>1.2.3.1</GATEWAY>
 <DHCP>0</DHCP>
</NetworkConfig>


A program on the device takes this and generates a /etc/network/interfaces file, creating an entry like so if DHCP=0:



auto wlan0
iface wlan0 inet static
 address 1.2.3.4
 netmask 255.255.240.0
 gateway 1.2.3.1


And an entry like so if DHCP=1



auto wlan0
iface wlan0 inet dhcp


So when trying to configure the device with a static IP, nothing updates /etc/resolv.conf and no DNS info is provided in the XML file. Is there no application which would be able to automatically updated /etc/resolv.conf? How/where does udhcpc get its dns info from?






dns resolv.conf







share|improve this question
















I'm on an IoT device running busybox with glibc. When I have a DHCP setup in /etc/network/interfaces then udhcpc atuomatically updates /etc/resolv.conf. I can see this by clearing /etc/resolv.conf and then starting udhcpc.



# udhcpc -i wlan0 --pidfile /tmp/udhpcp.pid
udhcpc: started, v1.26.2
udhcpc: sending discover
udhcpc: sending select for 172.20.53.151
udhcpc: lease of 172.20.53.151 obtained, lease time 46800
deleting routers
SIOCDELRT: No such process
adding dns 172.20.62.208
adding dns 172.20.108.123


However, when I have a static configuration setup in /etc/network/interfaces nothing updates /etc/resolv.conf. When can be done to have have a DNS server automatically added to /etc/resolv.conf when using a static IP configuration? Is this possible? Currently when this modules gets configured with a static IP no DNS hostname or IP is provided. Would it need to be provided if configured using a static IP?



Edit:



To further explain, the device gets its networks settings from an XML configuration file. This file has the four fields:



<NetworkConfig>
 <IP>1.2.3.4</IP>
 <NETMASK>255.255.240.0</NETMASK>
 <GATEWAY>1.2.3.1</GATEWAY>
 <DHCP>0</DHCP>
</NetworkConfig>


A program on the device takes this and generates a /etc/network/interfaces file, creating an entry like so if DHCP=0:



auto wlan0
iface wlan0 inet static
 address 1.2.3.4
 netmask 255.255.240.0
 gateway 1.2.3.1


And an entry like so if DHCP=1



auto wlan0
iface wlan0 inet dhcp


So when trying to configure the device with a static IP, nothing updates /etc/resolv.conf and no DNS info is provided in the XML file. Is there no application which would be able to automatically updated /etc/resolv.conf? How/where does udhcpc get its dns info from?






dns resolv.conf




dns resolv.conf






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 11 hours ago







dangeroushobo

















asked 13 hours ago









dangeroushobodangeroushobo

151110




151110







  • 1





    A DHCP server can send the DNS servers' addresses to the client, so it can update /etc/resolv.conf. How do you get the correct configuration into /etc/network/interfaces? In a similar way you have to fill /etc/resolv.conf.

    – Bodo
    12 hours ago











  • Currently the way the module works is an XML file is sent to the module and a program parses that and updates /etc/network/interfaces. That XML file doesn't have any DNS info and my understanding is that it would need to provided this if you're using a static IP configuration.

    – dangeroushobo
    12 hours ago











  • Please edit your question to add more information instead of writing comments. To get help you should describe how your configuration mechanism works. If you use standard tools I suggest to show your scripts, input and output.

    – Bodo
    11 hours ago











  • udhcpc gets its information from the dhcp reply. If you need to not used the dhcp reply information, you'll need to manually input all of its data, including ip address, netmask, gateway, dns servers, ntp servers, etc. It sounds like your XML is not up to the task that it's been given.

    – Doug O'Neal
    10 hours ago












  • 1





    A DHCP server can send the DNS servers' addresses to the client, so it can update /etc/resolv.conf. How do you get the correct configuration into /etc/network/interfaces? In a similar way you have to fill /etc/resolv.conf.

    – Bodo
    12 hours ago











  • Currently the way the module works is an XML file is sent to the module and a program parses that and updates /etc/network/interfaces. That XML file doesn't have any DNS info and my understanding is that it would need to provided this if you're using a static IP configuration.

    – dangeroushobo
    12 hours ago











  • Please edit your question to add more information instead of writing comments. To get help you should describe how your configuration mechanism works. If you use standard tools I suggest to show your scripts, input and output.

    – Bodo
    11 hours ago











  • udhcpc gets its information from the dhcp reply. If you need to not used the dhcp reply information, you'll need to manually input all of its data, including ip address, netmask, gateway, dns servers, ntp servers, etc. It sounds like your XML is not up to the task that it's been given.

    – Doug O'Neal
    10 hours ago







1




1





A DHCP server can send the DNS servers' addresses to the client, so it can update /etc/resolv.conf. How do you get the correct configuration into /etc/network/interfaces? In a similar way you have to fill /etc/resolv.conf.

– Bodo
12 hours ago





A DHCP server can send the DNS servers' addresses to the client, so it can update /etc/resolv.conf. How do you get the correct configuration into /etc/network/interfaces? In a similar way you have to fill /etc/resolv.conf.

– Bodo
12 hours ago













Currently the way the module works is an XML file is sent to the module and a program parses that and updates /etc/network/interfaces. That XML file doesn't have any DNS info and my understanding is that it would need to provided this if you're using a static IP configuration.

– dangeroushobo
12 hours ago





Currently the way the module works is an XML file is sent to the module and a program parses that and updates /etc/network/interfaces. That XML file doesn't have any DNS info and my understanding is that it would need to provided this if you're using a static IP configuration.

– dangeroushobo
12 hours ago













Please edit your question to add more information instead of writing comments. To get help you should describe how your configuration mechanism works. If you use standard tools I suggest to show your scripts, input and output.

– Bodo
11 hours ago





Please edit your question to add more information instead of writing comments. To get help you should describe how your configuration mechanism works. If you use standard tools I suggest to show your scripts, input and output.

– Bodo
11 hours ago













udhcpc gets its information from the dhcp reply. If you need to not used the dhcp reply information, you'll need to manually input all of its data, including ip address, netmask, gateway, dns servers, ntp servers, etc. It sounds like your XML is not up to the task that it's been given.

– Doug O'Neal
10 hours ago





udhcpc gets its information from the dhcp reply. If you need to not used the dhcp reply information, you'll need to manually input all of its data, including ip address, netmask, gateway, dns servers, ntp servers, etc. It sounds like your XML is not up to the task that it's been given.

– Doug O'Neal
10 hours ago










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