Squid config - same user multiple ips
Try something like:
acl user41 proxy_auth manfred
acl user41 myip x.213.223.188
acl user42 proxy_auth manfred
acl user42 myip x.213.223.189
and leave the tcp_outgoing_adress as is.
EDIT: ah yes, maybe instead something like
acl ip_1 myip x.213.223.188
tcp_outgoing_address x.213.223.188 ip_1
acl ip_2 myip x.213.223.189
tcp_outgoing_address x.213.223.189 ip_2
and leave the proxy_auth acls alone:
acl user_manfred proxy_auth manfred
Then
http_access allow user_manfred ip_1
http_access allow user_manfred ip_2