asa as dns ?

[techkamleshs]

hi

if asa is not acting as dhcp server and clients behind the inside interface of firewall are having static ip add   is it possible for the firewall to still assign the dns address considering that those dns servers are external to asa firewall . if no is it documented in any cisco guide ?

[Maykol Rojas]

Hi,

I would say no. DNS is just one of the multiple options on the DHCP packet. If the computers are not set to get an IP, they wont generate the DHCP Discover packet.

As documented in RFC, DNS is just an option.

http://www.ietf.org/rfc/rfc2132.txt

If you manage to assign an static IP to the host but, being able also to set the DNS as dynamic, that would be a good test. However, on XP machines, if you set the IP as static, it does not let you to use DHCP assigned DNS.

Hope it makes sense.

Mike