I have a 1721 with an ADSL WIC and a 4-port switch. I have it configured and it is connecting to SBC but I'm confused as to the ethernet ports. SBC gives me 5 static IPs. I use one for the Dialer interface. Do I use one for E0, another for E1, etc? Or do I set up DHCP within a VLAN?
Any pointers would be great. The current config is below.
Current configuration : 1364 bytes
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
no aaa new-model
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no ip dhcp use vrf connected
ip dhcp excluded-address 192.168.0.1
ip dhcp pool napa_dhcp
network 192.168.0.0 255.255.255.0
dns-server 18.104.22.168 22.214.171.124
no ip address
no atm ilmi-keepalive
dsl operating-mode auto
pppoe-client dial-pool-number 1
ip address 192.168.0.1 255.255.255.0
ip nat inside
ip tcp adjust-mss 1452
no ip address
ip address SOME.I.P.ADDRESS 255.255.255.248
ip nat outside
dialer pool 1
ppp chap hostname HOSTNAME
ppp chap password 0 PASSWORD
ppp pap sent-username USERNAME password 0 PASSWORD
You can use the remaining four either as part of a NAT pool or for making static mappings between public and private ip addresses (say for web, mail access from internet to the inside). On E0 and E1 (if required) you can use RFC 1918 addresses (private space) and then have those addresses nat overload on the dialer interface ip address.
You can use DHCP to assign private addreses on e0 and e1.
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