18. A computer system as recited in claim 17 , wherein when (i) a valid IPv6 reply is not received from the IPv6 DNS Server in response to either the second IPv6 query having the IP6.ARPA string or the first IPv6 query having the IP6.INT string, (ii) a “no answer” IPv6 reply having an IP6.INT string and a “no answer”IPv6 reply having an IP6.ARPA string are received from the IPv6 DNS Server in response to the second IPv6 query having the IP6.ARPA string and the first IPv6 query having the IP6.INT string and (iii) the timer has not expired, translating the “no answer” IPv6 reply having the IP6.ARPA string into an IPv4 reply having the IP-ADDR.ARPA string and dropping the “no answer” IPv6 reply having an IP6..
18. A computer system as recited in claim 17 , wherein when (i) a valid IPv6 reply is not received from the IPv6 DNS Server in response to either the second IPv6 query having the IP6.ARPA string or the first IPv6 query having the IP6.INT string, (ii) a “no answer” IPv6 reply having an IP6.INT string and a “no answer”IPv6 reply having an IP6.ARPA string are received from the IPv6 DNS Server in response to the second IPv6 query having the IP6.ARPA string and the first IPv6 query having the IP6.INT string and (iii) the timer has not expired, translating the “no answer” IPv6 reply having the IP6.ARPA string into an IPv4 reply having the IP-ADDR.ARPA string and dropping the “no answer” IPv6 reply having an IP6.. 19. A computer system as recited in claim 18 , wherein when (i) a valid IPv6 reply is not received from the IPv6 DNS Server in response to either the second IPv6 query having the IP6.ARPA string or the first IPv6 query having the IP6.INT string, (ii) a “no answer” IPv6 reply having an IP6.INT string is only received from the IPv6 DNS Server in response to the first IPv6 query having the IP6.INT string and (iii) the timer has not expired, translating the “no answer” IPv6 reply having the IP6.INT string into an IPv4 reply having the IP-ADDR.ARPA string.