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Very simple setup (newbie)

cecchinienrico
Level 1
Level 1

Hi,

I bought a cisco 837 router. My adsl connection has a single public IP (82.X.X.130) and also another set of IP addresses from 81.X.X.56 to 81.X.X.63 (netmask 255.255.255.248).

The java-based configuration utility shipped with the router allows me to set-up the NAT and some firewall rules, BUT I simply want the router to route all traffic to the inside, with NO nat and NO firewall whatsoever!

In fact, my goal is simply to have a pc (connected to the router) with address 81.X.X.57 that receives it's packets from the Internet...

I am a newbie and I'd like some help to setup such a simple scenario, I think I have to use CLI but I have no clue.

Thanks to all in advance

3 Replies 3

Hello,

can you access the command line and post the output of ´show run´ ?

Regards,

Georg

Hi Georg,

I'll do it early tomorrow morning, and I'll post the output here.

Thank you in advance for your help

Hi, the output of show run is:

-----------------------

Current configuration : 1288 bytes

!

version 12.2

no service pad

service timestamps debug uptime

service timestamps log uptime

service password-encryption

!

hostname admin

!

logging queue-limit 100

enable secret 5 $1$T6AO$gcK6oNWO9Gsx/WYS6HDkB.

!

username admin password 7 025756085F5359

ip subnet-zero

ip name-server 151.99.125.2

ip name-server 151.99.125.3

ip dhcp excluded-address 81.X.X.57

!

!

ip audit notify log

ip audit po max-events 100

no ftp-server write-enable

!

!

!

!

!

!

!

interface Ethernet0

ip address 10.10.10.1 255.255.255.0

ip nat inside

no ip mroute-cache

hold-queue 100 out

!

interface ATM0

no ip address

atm vc-per-vp 64

no atm ilmi-keepalive

dsl operating-mode auto

!

interface ATM0.1 point-to-point

ip address 81.X.X.58 255.255.255.248

ip nat outside

pvc 8/35

encapsulation aal5snap

!

!

ip nat inside source list 102 interface ATM0.1 overload

ip nat inside source static 81.X.X.57 interface ATM0.1

ip classless

ip route 0.0.0.0 0.0.0.0 ATM0.1

ip http server

no ip http secure-server

!

access-list 23 permit 10.10.10.0 0.0.0.255

access-list 102 permit ip 10.10.10.0 0.0.0.255 any

!

line con 0

exec-timeout 120 0

no modem enable

stopbits 1

line aux 0

stopbits 1

line vty 0 4

access-class 23 in

exec-timeout 120 0

login local

length 0

!

scheduler max-task-time 5000

!

end

-----------------------

It is the result of the configuration made with the java utility... so far in practice I have a double nat (LAN => linux fw (192.168.1.2)->(10.10.10.3) => cisco 837 (10.10.10.1)->(81.X.X.58) => Internet

But all I'd like to have is simply the cisco that routes ALL the packets it receives into the internal lan (where there is a linux fw machine connected directly to it with an interface with a public ip address taken from the range of public ips' assigned to us)

Thank you in advance for your help!