Putty SSH connection with different client IP-address

Question

I am using PuTTY and a VNC viewer to control my Raspberry Pi. Now, I have to change the static IP-address of the LAN Interface of my PC from:

192.168.0.1

to

ip: 192.168.1.20
netmask: 255.255.0.0

RPi IP:

ip: 192.168.10.100
netmask: 255.255.0.0

The problem is that PuTTY cannot connect to the Raspberry Pi anymore, if I do so.

Is it even possible to control the Raspberry Pi, if I change the client IP-address? And if so, what do I have to configure on the Raspberry Pi so that this works?

Here my properties of the LAN Interface on the PC (sorry, it's in german):

Here my dhcpcd.conf on the RPi:

(I already tried to change static routers and static domain_name_servers to 192.168.1.20)

And my interfaces:

# interfaces(5) file used by ifup(8) and ifdown(8)

# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto lo
iface lo inet loopback

iface eth0 inet dhcp

# WLAN-Interface Hostapd
allow-hotplug wlan0
iface wlan0 inet static
address 192.168.1.1
netmask 255.255.255.0

Answer 1

Ok, I managed to solve the problem.

The thing was, that my WLAN network already allocated the IP-addresses 192.168.1.X, so the RPi could not connect to the IP-address 192.168.1.20.

Now, I use 192.168.2.X for my WLAN network.

Answer 2

First of all:

why you have setup domain_name_servers=192.168.0.1? maybe is better to use google DNS 8.8.8.8

try to change netmask on interfaces and set it on 255.255.0.0