I just bought an ASA 5505 to use at home. I'm replacing an old Linksys Cable/DSL router. I'm having some trouble configuring it to forward DNS queries from internal machines to the DNS server at the ISP. The ASA's outside interface is connected to a cable modem and pulls it's IP via DHCP.
Internal machines get DNS from a pool but I've been forced to actually look up the DNS servers for the ISP and add them to the pool. Is there a way to set the DNS server as the IP of the ASA and have it just forward the requests to the ISP's servers?
Here's my config. It's pretty basic.
chizzle-mang# sh run
ASA Version 7.2(2)
ip address 192.168.117.1 255.255.255.0
ip address dhcp setroute
switchport access vlan 2
ftp mode passive
access-list outside-in extended permit gre any interface outside
access-list outside-in extended permit tcp any interface outside eq 6112
The dhcpd auto_config outside command should take care of this problem for you. What happens if you remove the 'dhcpd dns' configuration? With no dhcpd dns configured, and the auto_config enabled, the dns settings are supposed to pass through.
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