If RIDENT="server" is specified, identification information about the
client socket got by getsockname(2) and getpeername(2) will be
forwarded to the PROXY or MASTER-DeleGate which will receive the
information by RIDENT="client", and will use it for access control.
A DeleGate server with RIDENT="client" can accept both from DeleGate
with RIDENT="server" and other proxy servers with no RIDENT support.
An intermediate DeleGate in a chain of cascaded DeleGate servers
should be given RIDENT="client,server".