A Note on DNS Round Robin

For optimal operation of the array, the DNS server that resolves the name of the Netra Proxy Cache Array should support round robin. The default time-to-live (TTL) used by the DNS server in the array assumes round-robin support. With round robin, the array can respond to changes (including overloads and host failures) far more quickly than it can without round robin.

If your DNS server does not support round robin, you can reduce the TTL to a low value, such as 30 seconds. If your DNS server does not support a TTL as low as 30 seconds (for example, older DNS servers do not support TTL values of less than five minutes), it is recommended that you upgrade to a DNS server that supports round robin.

For support of round robin, the correct version of bind is 4.9.3 (or later). This version is shipped with Solaris 2.5.1 SHWP (the Solaris version shipped with the Netra Proxy Cache product) and is available in the following patches:

• For Solaris 2.4, patch #102479-07

• For Solaris 2.5, patch #103667-07

• For Solaris 2.5.1 (pre-SHWP), patch #103663-08

If your DNS server is a non-Solaris machine, you should upgrade that server to a 4.9.3 version of bind that has round-robin capability.

See Section 5.4 of the Netra Proxy Cache Array User's Manual for instructions on changing the DNS's TTL for the array.