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NAT issue between dsl modem router and cisco router

RaymondTPreston
Level 1
Level 1

Im trying to setup a cisco 87x isr. On FA 0 i have the default switchport access vlan 1 with ip address 10.0.10.2 which is connected to a consumer DSL router ip address 10.0.10.1 and with nat enabled.

Now i enable fa1 and set switchport-access vlan 11 with ip address 10.0.1.1  which will be for my network firewall and connect it to a NIC on the server (only nic on the server at the moment with firewall disabled) and set this nic to 10.0.1.2.

Finally i set the gateway of last resort to 10.0.10.1. At this point the router can ping 8.8.8.8 but the server cant get any further than 10.0.10.1.

I have tried turning off NAT on the dsl router and doing ip nat outside on vlan 1 and ip nat inside on vlan 11 but ping 8.8.8.8 on the cisco router fails then.

Can anyone suggest what im doing wrong ? i cant seem to get a ping to 8.8.8.8 on the server no matter what nat configuration i do.

1 Reply 1

cadet alain
VIP Alumni
VIP Alumni

Hi,

Can you try this:

ip  route 0.0.0.0 0.0.0.0 10.0.10.1

int vlan 11

ip nat inside

int vlan 1

ip nat outside

access-list 99 permit 10.0.1.0 0.0.0.255

ip nat inside source list 99 interface vlan 1

Regards

Alain

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