4. DSL Router Configuration Examples
Simultaneous Basic NAT and NAPT Configuration Example
The DSL router can be configured for Basic NAT and NAPT simultaneously. In the private address space, multiple work stations can use NAPT and the servers can use Basic NAT. This allows a server to support traffic other than TCP/UDP traffic and accommodate multiple inbound traffic types. Using Basic NAT also allows you to have multiple servers of the same type (Web, FTP, Telnet) on the private network. All private addresses not specified in a Basic NAT map command will be translated via NAPT.
Customer Premises (CP)
Core
Router
155.1.3.1Console 
Port
|
| Connection | |
DSL |
| Ethernet | |
WAN |
| eth1 | |
dsl1 | DSL | ||
155.1.3.2 | 10.1.3.1 | ||
Router |
Web Server/ |
FTP/Telnet |
10.1.3.2 |
10.1.3.3 |
Web |
Server |
10.1.3.6 |
10.1.3.7 |
Hub |
10.1.3.8 |
In this Simultaneous Basic NAT and NAPT example:
Since Basic NAT is enabled and the dsl1 interface address is on the same subnet as the Basic NAT global IP network address, Proxy ARP must be enabled on the DSL interface (dsl1).
If IP Scoping is enabled, the client’s NAT mapping public IP addresses and the dsl1 interface IP address must be entered into the client VNID table.
The commands and syntax for this example are:
ip routing enable
ifn address eth1 10.1.3.1 255.255.255.0 ifn address dsl1 155.1.3.2 255.255.255.0 ip route create upstream eth1 155.1.3.1 nat basic address 155.1.3.0
nat napt address 155.1.3.2
nat basic map 155.1.3.3 10.1.3.2 10.1.3.3 nat basic enable
nat napt enable
proxy arp dsl1 enable
November 2003 |
