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New Member

Help needed with 806 NAT setup.

Ok, first off, I know hardly anything about this but got stuck doing it anyway.

I'm attempting to setup a cisco 806 with NAT. It will be connected between a DSL router and the LAN to provide internet access to stations on the LAN. I have to do the routing and NAT here because the DSL router won't do it, and the way the ISP assigns the IP's is a little screwy.

I need it to do nat from the inside addresses 10.0.0.x to the outside public addresses 65.x.x.x.

I'm using the standard IOS software, do I need a different feature pack?

From the 806:

I can ping DSL router

No name resolution out.

I can ping LAN

From local station:

I can ping Lan int on 806

all other outside pings return dest unreachable

DSL Router:

LAN int set on 65 net

NAT off

DHCP off

If I switch the local machine over to the 65 net (IP and GW) it works fine. But the local machines MUST remain on the 10.0.0.x net.

Am I going about this all wrong?

Here's what I have so far. Thanks for any help you can give. Here's an example of what I'm trying to do.

Is this even possible to do?

show run

Building configuration...

Current configuration : 1480 bytes


version 12.2

no parser cache

no service single-slot-reload-enable

no service pad

service timestamps debug uptime

service timestamps log uptime

service password-encryption


hostname xxxx


logging rate-limit console 10 except errors

enable secret 5

enable password 7


username xx password 7

ip subnet-zero

ip name-server 205.152.0.x *********ISP DNS servers

ip name-server 205.152.0.x

ip name-server 205.152.0.x


no ip dhcp-client network-discovery

lcp max-session-starts 0




interface Ethernet0

description LAN connection ********Connected to LAN hub

ip address *********Set as gateway on local


ip nat inside

no cdp enable

hold-queue 32 in


interface Ethernet1

description WAN connection to ISP

ip address 65.x.x.2 ******** (one of 5 public IP's, other

2 will be static later connected to DSL router)

ip nat outside

no cdp enable


router rip

version 2


no auto-summary


ip default-gateway 65.x.x.1 **********(dsl router lan


ip nat pool DynamicUsers 65.x.x.4 65.x.x.5 netmask

*********2 of the 5 public IPs that private dhcp stations will use for


ip nat inside source list 1 pool DynamicUsers overload

ip classless

ip http server


access-list 1 permit **********(allow everything

from this net to go out)

access-list 111 permit icmp any any echo

access-list 111 permit icmp any any time-exceeded

access-list 111 permit icmp any any echo-reply


line con 0

exec-timeout 120 0

stopbits 1

line vty 0 4

exec-timeout 0 0

login local

length 0


scheduler max-task-time 5000


New Member

Re: Help needed with 806 NAT setup.

What DSL Router are you using?


New Member

Re: Help needed with 806 NAT setup.

Cayman 3220-H software v6.2

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