3Com 10014299 manual Configure address access control list and dialer-list

356CHAPTER 21: CONFIGURING IP APPLICATION

The internal LAN of an enterprise can dial-up to access Internet by the address translation.

I. Networking Requirement

The internal LAN of an enterprise can dial-up to access Internet through serial port

S0 by the address translation of the 3Com Router series.

II. Networking Diagram

Figure 133 NAT configuration case networking diagram 2

PC A

PC B

Router

Internet

Modem

III. Configuration Procedure

1 Configure address access control list and dialer-list

[Router] acl 1

[Router-acl-1]rule permit source 10.110.10.0 0.0.0.255 [Router] dialer listen-rule 1 ip 10.110.10.0 255.255.255.0

2Configure dial-up property for the interface

[Router-Serial0]physical-mode async

[Router-Serial0] link-protocol ppp

[Router-Serial0]ip address ppp-negotiate

[Router-Serial0]ppp pap local-user 169 password simple 169

[Router-Serial0] modem

[Router-Serial0]dialer enable-legacy

[Router-Serial0] dialer-group 1

[Router-Serial0] dialer number 169

3Correlate the address translation list and the interface

[Router-Serial0]nat outbound 1 interface

4Configure a default route to serial 0

[Router] ip route-static 0.0.0.0 0.0.0.0 serial 0

Troubleshooting NAT Fault 1: Address translation abnormal

Configuration	Troubleshooting: Turn ON the debug switch for NAT, and refer to debugging nat
	in the debugging command for specific operation. According to the Debug
	information displayed on the router, initially locate the failure, and then use other
	commands to check further. Observe the source address after translation carefully,
	and make sure that it is the expected address. Otherwise, it is possible that the
	configuration of address pool is wrong. Meanwhile, make sure that there is
	routing to return to the address pool segment in the network to be accessed. Take
	into consideration the influence of firewall and address list of the address
	conversion itself on address conversion, and also route configuration.