How Db2 sends requests

When sending a request, Db2 uses the value in the LINKNAME column of the SYSIBM.LOCATIONS table to determine which network protocol to use.

• If Db2 finds the same value in the LINKNAME column of the SYSIBM.IPNAMES table, it uses TCP/IP.
• If Db2 finds the same value in the LUNAME column of the SYSIBM.LUNAMES table, it uses SNA.
• If Db2 finds the same value in both SYSIBM.IPNAMES and SYSIBM.LUNAMES, it uses TCP/IP.