You need the ASA to be able to resolve external hostname's.

Note: In this example I'm using 122.122.122.199 and 122.122.122.198 (yes, they cannot exist!)as the external DNS addresses, substitute your own.

1. Whilst in enable mode > enter configure terminal mode, then enable DNS Lookups.

CiscoASA#conf t
CiscoASA(config)# dns domain-lookup Outside

2. Then specify the external DNS Servers (Change IP addresses appropriately).

CiscoASA(config)# dns server-group DefaultDNS
CiscoASA(config-dns-server-group)# name-server 122.122.122.199
CiscoASA(config-dns-server-group)# name-server 122.122.122.198
CiscoASA(config-dns-server-group)# exit

3. Test it by pinging a name/URL.

CiscoASA(config)# ping www.petenetlive.com
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 123.123.123.123, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 70/84/110 ms
CiscoASA(config)#

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