Gigaset 108 Owner's Manual page 111

This cancels all IP address assignments.
ì
At the prompt, enter the command IPCONFIG /RENEW and then the name of the
network adapter that is to be given the correct IP address, in this example "Wireless
network connection".
ì
Example: IPCONFIG /RENEW "Wireless network connection"
ì
Press the ENTER key.
IP addresses are now assigned. Independently of the settings under Windows, the
PC now recognises the gateway address of the Gigaset WLAN Repeater 108 and
inserts it as the default address.
Appendix
109