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User’ Guide
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¾ dhcp dns delete {1~4/all}
Remove one/all dhcp server dns ip address(es) setting.
¾ dhcp domain-name set {domain name}
Set domain name manually.
¾ dhcp domain-name delete
Delete domain name manually assigned.
NAT
Network Address Translation/Port Address Translation (NAT/PAT) gateway is designed for IP address
simplification and conservation, as it enables private IP network that uses no registered IP addresses to
connect to the Internet. NAT/PAT operates on a cable modem router, connecting to Internet, and
translates the private (not globally unique) addresses in the internal network into legal addresses before
packets are forwarded onto the Internet. As part of this functionality, NAT can be configured to advertise
only one address for the entire network to the outside world. This provides additional security,
effectively hiding the entire internal network from the world behind that address. NAT has the dual
functionality of security and address conservation, and is typically implemented in remote access
environments.
¾ ip nat {enable/disable}
Enable/disable NAT/PAT gateway function
¾ nat timer {tcp/udp/gre/icmp/dns} {1~86400 sec}
Set aging time for different protocol session
One to one mapping
¾ nat static ipmapping add { private ipaddress} { global ipaddress}
Set NAT one to one mapping table
Example:
CM>nat static ipmapping add 64.168.39.3 192.168.100.4
Set global IP 64.168.39.3 to private IP 192.168.100.4
CM>show nat config