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Configuring a Cisco PIX firewall

By dguillermo ·
Does anyone know if I could setup DNS forwarding on a Cisco PIX 515 firewall. I am not sure how to add DNS servers to the firewall config. Any ideas please let me know.

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Configuring a Cisco PIX firewall

by eBob In reply to Configuring a Cisco PIX f ...

I have setup a few PIX and have not configured DNS fwding. I let the DNS servers figure this out for themselves, and just made sure that the PIX was passing the traffic.

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Configuring a Cisco PIX firewall

by dguillermo In reply to Configuring a Cisco PIX f ...

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Configuring a Cisco PIX firewall

by estebandelatorre In reply to Configuring a Cisco PIX f ...

The DNS forwarding should be defined on your DNS servers. The firewall only has to allow the dns servers to go to the internet (or the other side of the firewall) with an packet UDP on port 53. You will need to create 2 rules, one for sending and another for receiving UDP packets on port 53 for the specified ip address/host or whatever rule you define.
The DNS itself must know where (ip address) of it's forwarding DNS server.

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Configuring a Cisco PIX firewall

by dguillermo In reply to Configuring a Cisco PIX f ...

I am actually more concerned with the ISP's DNS servers. How do I specify those addresses in the PIX firewall. I have an old BayNetworks firewall in which I added my ISP's DNS addresses and on the workstations all I have to do is set the DNS address as the firewall adress.

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Configuring a Cisco PIX firewall

by eBob In reply to Configuring a Cisco PIX f ...

The way it worked with your Bay Firewall is not how it works with the Pix. See the previous responses.

Sorry if that's not what you wanted to hear.

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Configuring a Cisco PIX firewall

by dguillermo In reply to Configuring a Cisco PIX f ...

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Configuring a Cisco PIX firewall

by dguillermo In reply to Configuring a Cisco PIX f ...

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