cable modem to cisco router

[megacafenui]

to avoid double natting.

would it work if my cisco router interface have this configuration

int f0/0 DHCP

no nat outside

int f0/1 192.168.215.1

no nat inside.

basicially i am grabbing dhcp from the modem and having it do NAT

then I turn nat off on cisco router.

[Georg Pauwen · Accepted solution]

Hello,

that is definitely going to work and quite a common setup. Just make sure to set the default route on the Cisco to the actual IP address assigned to your cable modem, as I have seen multiple cases where:

ip route 0.0.0.0 0.0.0.0 FastEthernet0/0

or

ip route 0.0.0.0 0.0.0.0 dhcp

doesn't seem to work well.

[megacafenui]

thanks for responding.

another question if I reverse it. would it work as well? example

cable modem disable nat

and leave nat on cisco router

int 0/0

nat outside

int f0/1

nat inside

[Georg Pauwen]

Hello,

for that to work you would have to put your cable modem in bridge mode. Other than that, yes that would work.

[megacafenui]

appreciated thanks you much...