Increasing the lease time isn’t the answer; you need to use a static address for the Echolink computer. You can setup the computer you use for Echolink to have a static address and still allow all the other computers to use DHCP. Some routers will assign a static address by MAC address, but if yours doesn’t you can set it up on the computer itself. Just pick an unused IP address outside of the range issued by the DHCP service of the router. Usually 192.168.1.2 or 192.168.1.254 are safe but you should be able to find where the routers DHCP range is set in its setup screens. Google for “setting up a static IP” for your specific OS. You will need to enter the IP address you want for the computer, a Subnet mask (255.255.255.0 for almost all home routers), the Default Gateway (the address of your router, 192.168.1.1 for most home routers), and your DNS servers. You can get the DNS servers by running “ipconfig /all” at a command prompt or use a set of public DNS servers (Googles are 22.214.171.124 and 126.96.36.199 and OpneDNS’s are 188.8.131.52 and 184.108.40.206).