[lug] help

[张少驰]

Hello.
  First I'm sorry to say that I write this letter to you without obtaining your permission,I beg your pardon.I have question about DNS.I want to know reverse DNS role.When I input a IP address,DNS will return the IP's relevent domain,what role of this function in DNS? My second question whether adverse DNS is related with firewall,if has,what is it?Any ideas will be appreciated.
                                  Thanks!

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