Many application protocols carry IP addresses in an application-level
protocol. In such cases, an Application-Level Gateway (ALG) is needed to
complete the translation. For example:
Obviously DNS, responsible for domain name/IP address mapping, is impacted
by NAT. From simple query handling to zone transfers, a robust DNS ALG is
defined by RFC 2694 [9] .
Check this link:
http://www.cisco.com/warp/public/759/ipj_3-4/ipj_3-4_nat.html
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http://www.groupstudy.com/form/read.php?f=7&i=8017&t=7915
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