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To accept an incoming TCP connection via a SOCKS-DeleGate server, the network interface to be used for it is selected automatically by DeleGate (based on the DST.ADDR or DSTIP which is sent from a SOCKS client as the parameter of the BIND command). With the SRCIF parameter, you can select a network interface (and port number) manually, with the pseudo protocol name "tcpbind". The complete syntax of the parameter is SRCIF= "[host]:[port]:tcpbind[:dstHostList[:srcHostList]]". Typically, only the host filed is specified to select a network interface, like SRCIF="18.104.22.168::tcpbind" for example.
NOTE: When you chain DeleGate with another SOCKS server, it may cause problems in UDP relaying due to the private and tentative extensions to the SOCKS protocol by DeleGate. The following SRCIF parameters can be useful to escape such problems.