Yes you can. You'll need to set up a DNS server group with your dns servers, and you'll need to configure domain lookup.
DNS server-group MYDNS
name-server 4.2.2.1
name-server 4.2.2.2
domain-name whatever.com
domain-lookup outside
In your crypto map:
crypto map 1 set peer my.vpn.com
Should work.
HTH,
John
HTH,
John
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