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06-05-2013 11:32 PM
Hi,
We are looking for a way to forward All dns requests to internal DNS ip.
Either client changes its ip address to public dns addresses it should be forwarded to internal.
Can we do that ?
We don't want to write a deny rule for public Dns requests.
We don't want to enforce client's dns.
06-08-2013 01:16 AM
Hi, except from DNS-proxy another way to accomplish this is using U-turn NAT configuration
Source Zone: Trust-Zone
Dest Zone: Untrust-Zone
service: dns (53tcp +53udp)
Source : Your internal network
Dest: External Dns server IP (ie 8.8.8.8 google)
Source translate: dynamic-ip-port (PAT) of your internal firewall interface
Dest translate: Your internal DNS server IP
Also you need a permit security policy from Trust-Zone to Trust-Zone
The drawback that you need a NAT entry for every external dns server, but if you verify which ones is mostly used I think that 10 rules could match 90% of your dns external requests.
06-08-2013 01:36 AM
That solution is talked before.There are many Dns public and 1 rule for every ip is not good.
Thanks.
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