Two Different IP addresses on one NIC

[jayjr1105]

Running Armbian on a Rock64 (RK3328) board and in turn running pihole for DNS.  I cannot seem to be able to get rid of the secondary IP address that is pulling from DHCP.  the main static address I set duing pihole setup is 10.4.5.2.  Any way to remove the 10.4.5.98?  ifconfig from terminal only shows the .98 address.

[djurny]

Hi,

How are you configuring your interfaces? ifup/ifdown or NetworkManager?

How many NICs do you have on the system? Both are connected to the same network?

 

Can you share output of:

# show current dhcp clients
pgrep -al dhclient
# show network manager info
sudo nmcli dev sh
sudo nmcli con sh
# show interface info
sudo ifconfig -a
# show ifup/ifdown config
cat /etc/network/interfaces
cat /etc/network/interfaces.d/*
# show current listening adresses of dnsmasq
sudo netstat -anp -Aip

 

Groetjes,

[arox]

You didn't say if pihole works or not. I do not think ifconfig is able to report complex configurations correctly. (That may or may not work).

 

Anyway it is recommended in pihole tutorials to setup a static IP address. For example edit  : /etc/dhcpcd.conf.

 

# Example static IP configuration:
interface eth0
static ip_address=10.4.5.2/24 
#static ip6_address=fd51:42f8:caae:d92e::ff/64
static routers=10.4.5.1                    #adresse IP du modem/routeur
#static domain_name_servers=192.168.0.1 8.8.8.8 fd51:42f8:caae:d92e::1

 

Note that you need to be careful to specify the correct bitmask : 10.4.5.2/24 means a 24 bit netmask although your router may think otherwise.

 

[tparys]

Though common, ifconfig was unmaintained for many years. The tool you want is ip, and is overall a much more capable.

 

# Shows IP addresses for all devices
ip addr show

# Removes a particular address from a given device
ip addr del 192.168.1.200/24 dev eth0

 

This doesn't really solve why DHCP is starting up and pulling a second address for you, but can help get rid of multiple addresses once you kill it.