- Silver, 250 points or more
I was thinking of picking up a Cisco 877W router to act as my wireless modem/router. However my ISP will not support Cisco though they have provided a basic configuration to get the ADSL up and running.
I am not sure I understand the configuration and was wondering if someone would be kind enough to explain the parts marked in red in the attached configuration.
I am not sure that I understand why the ATM0 interface has no IP address assigned but the Eth 0 interface does and how they tie together.
Also I assume that I need to create a VLAN for my inside IP addresses (192.168.x.x) and configure NAT, a DHCP server and appropriate ACL's?
If anybody could provide a complete (ADSL, NAT & DHCP) example config, it would be much appreciated.
Extra Information: Currently my public IP is dynamically assigned though in the near future I hope to switch to having a static IP address assigned.
Best Regards & TIA,
> In the portion of configuration below, which also came from my ISP and I am told is for use with a static
> IP address(es), it appears that the static IP address (or one from a range) is assigned to Interface Vlan1.
> Is this correct?
You can assign the IP address to interface Vlan1 or to interface dialer1. If you assign to interface Vlan1, you can assign other public IP addresses to devices connected to FastEthernet0 thru FastEthernet3 since they also belong to Vlan1. If you assign the IP address to dialer1, you can only use that IP address on that interface (like a point-to-point connection).
The unnumbered command will clone the IP address from Vlan1 in Dialer1.
> If I then wanted to have the router assign private IP addresses to my inside clients.
> I would do the following, ......
> If an ISP provided a number of public IP addresses (say a /29 subnet),
> is it possible to configure a NAT pool and have these 6 IP addresses perform overloading?
Yes, you can also assign static IP address to devices connected in FasEthernet0 thru 3 as I explained above.
Please see this link:
You will need ip address negotiated under dialer1 if you are using dynamic IP address from the provider.