On 2/27/2018 7:07 PM, Thomas George wrote:
The Samsung CLP-320 printer's static ip 192.168.1.139 was set about 
10 years ago to work on a lan using 192.168.1.x addresses. Last week 
the lan's router failed and was replaced with a Netgear r6700 router 
using 192.168.2.x addresses. The printer is now inaccessible from the 
lan.
Cups Administration says the printer address can be set using its MAC 
address:
      Configuring the IP Address Using DHCP
The DHCP protocol is the usual way of setting the IP address of a 
printer on a managed network. Using the standard dhcpd(8) program 
supplied with UNIX you simply need to add a line to the 
/etc/dhcpd.conf file:
host/hostname/  {
   hardware ethernet/mac-address/;
   fixed-address/ip-address/;
}
Make sure that the hostname you use is also listed in the /etc/hosts 
file or is registered with your DNS server.
apt-cache search dhcpd finds udhcpd. My pc's system is Debian 
Stretch. There is a file /etc/dhcp/dhclient.conf but no file /etc/dhcpd.
Is it possible to access the printer and change  its address to one 
in 192.168.2.x or to reset it to use dhcp?
The daemon 'dhcpd' is package 'isc-dhcp-server'.
Can't you change the IP of your ISP router to use the subnet 192.168.1.*?