Forum OpenACS Q&A: Response to AOLServer serving same site from different addresses

You can do this:
ns_section ns/server/myserver/module/nssock
ns_param timeout 120
ns_param Address 10.0.0.1
ns_param Port 80

ns_section ns/server/myserver/module/nssock2
ns_param timeout 120
ns_param Address 127.0.0.1
ns_param Port 80

ns_section ns/server/myserver/modules
ns_param nssock      nssock.so
ns_param nssock2     nssock.so