The host machine must be configured properly to handle IPv6 for the LispWorks interface to work with IPv6.
It is likely that all new machines can use IPv6.
By default IPv6 addresses do not work on Microsoft Windows XP. To make it work on Windows XP, install the interface by executing this command in a console, as an administrator user:
netsh interface ipv6 install
This should not be needed on later versions of Microsoft Windows. Search for netsh on
technet.microsoft.com
for more information.
Note: LispWorks 7.0 and later versions do not support Windows XP.
LispWorks User Guide and Reference Manual - 13 Feb 2015