All statically assigned addresses, but dhcpcd still runs?

I have a VM (on ESXi 5.1.0) running Debian Wheezy (7.0).

eth0 has a statically assigned address. eth1 was DHCP-assigned, and now I want to make it static.

Here is my old /etc/network/interfaces:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo eth0 eth1
iface lo inet loopback
# The primary network interface
allow-hotplug eth0 eth1
iface eth0 inet static address 10.2.1.77 broadcast 10.2.1.255 netmask 255.255.255.0 pointopoint 10.2.1.1
iface eth1 inet dhcp

And here is my new /etc/network/interfaces:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo eth0 eth1
iface lo inet loopback
# The primary network interface
allow-hotplug eth0 eth1
iface eth0 inet static address 10.2.1.77 broadcast 10.2.1.255 netmask 255.255.255.0 pointopoint 10.2.1.1
iface eth1 inet static address 10.1.0.254 netmask 255.255.255.0 gateway 10.1.0.1 dns-nameservers 8.8.8.8

When I reboot, I can see dhcpcd try to renew my lease for my old DHCP-assigned address, and succeed. And then it overwrites /etc/resolv.conf, which should contain 8.8.8.8 but does not. eth1 does have the correct (static) address, however.

What am I doing wrong here? I don't want to disable dhcpcd outright. In the near future I might switch eth1 back to DHCP, or add a third DHCP-assigned interface.

5 Answers

Run (as root):

update-rc.d -f dhcpd remove

If you want to re-enable it in the future,

update-rc.d dhcpd defaults

NOTE: Removing it from rc.d will disable it on all interfaces. Restoring it will enable on all interfaces.

4

If you are using dhcpcd (the client daemon, most people here are confusing it with DHCP and DHCPd which is different), then add the following text on the bottom of /etc/dhcpcd.conf

static
interface eth0
static ip_address=172.16.0.5/24
static routers=172.16.0.1
static domain_name_servers=8.8.8.8

Of course remember to replace the IP info with your network details.

1

The man page for dhcpcd tells us:

denyinterfaces pattern

 When discovering interfaces, the interface name must not match pattern which is a space or comma separated list of patterns passed to fnmatch(3).

To stop dhcpcd from operating on an interface(s), you can ask it to leave the interface alone by adding the a line to /etc/dhcpcd.conf.

in the OPs case this would be:

denyinterfaces eth0

This should stop dhcpcd messing with you on that specific interface while leaving dhcpcd enabled. This also lets you keep your interface configuration in /etc/network/interfaces. The other option is using what Ariffer suggested (Using /etc/dhcpcd.conf to do your config instead of /etc/network/interfaces.)

You could disable the service.

The preferred method would be to update the /etc/sysconfig/network-scripts/ifcfg-* file for the device removing the dhcp line (or altering it to false)

Unfortunately I'm not in front of my linux machine right now so I can't pull the exact configuration for you.

3

This is caused by a limitation in dhcpcd5 - it enables DHCP on all interfaces (all or nothing). I fixed this by switching to isc-dhcp-client which is more flexible.

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