Use multiple IP addresses on a PPPoE dialer interface

[ittechk4u1]

Hello Experts,

ISP provided us the 8 Public IP address(/29 - only 5 usable).

Here is our layout:

Router1 is connected to Modem, and here is the config on it. It is working perfectly.

interface FastEthernet0/0
 description *** Internet ***
 no ip address
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip mtu 1300
 ip inspect myfw out
 ip tcp adjust-mss 1260
 duplex auto
 speed auto
 pppoe enable
 pppoe-client dial-pool-number 1
 no cdp enable
!
!
interface Dialer1
 ip address xxx.xxx.xxx.169 255.255.255.248
 ip access-group internet in
 encapsulation ppp
 no ip mroute-cache
 dialer pool 1
 dialer-group 1
 no cdp enable
 ppp authentication chap callin
 ppp chap hostname <.......>
 ppp chap password 7 <.......>

What should be the config on Router2 with another public IP address.

Here is the config done by me.... please let me know if its correct or do i need to modify it ???

interface GigabitEthernet0/0
 description *** Internet ***
 no ip address
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip mtu 1300
 ip inspect myfw out
 ip tcp adjust-mss 1260
 duplex auto
 speed auto
 pppoe enable
 pppoe-client dial-pool-number 1
 no cdp enable
!
!
interface Dialer1
 ip address xxx.xxx.xxx170 255.255.255.248
 ip access-group internet in
 encapsulation ppp
 no ip mroute-cache
 dialer pool 1
 dialer-group 1
 no cdp enable
 ppp authentication chap callin
 ppp chap hostname <.......>
 ppp chap password 7 <.......>
!

Thanks

[Georg Pauwen]

Hello,

I am not sure if your setup is possible, as most modems have just one uplink port, anything else will be treated as a LAN host. What type/brand is your modem ?

[ittechk4u1]

Thanks for the quick answer. Sorry I am not aware about the Modem brand because its on remote location...

But......next question...

Suppose Modem has only one Port then can we put a 8 port switch in between Modem & these routers ? and then paste the above config...will it work ?

Thanks Again

[Georg Pauwen]

Hello,

the thing is that your ISP expects only one hostname for authentication, if you connect two routers, one will probably not be able to authenticate.

That said, can you access the modem remotely ? Since you assign a public IP address on your first router, it sounds like your modem is in bridge mode. If you set it to routing mode, you can just connect both of your routers as DHCP clients. A switch or hub between the modem and the routers would give you the ports needed. Your routers would both get an 192.168.x.x address, which then would be NATted and routed by the modem...

Does that make sense ?

[ittechk4u1]

Hi Georg,

I don't have access to modem as it is handled/managed by the Provider.

But I will convey my concern to the ISP and try to resolve it.

I will keep you updated....

Thank you very much for your help.