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Configure Cisco 857 without NAT

Posted on 2009-03-30
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Last Modified: 2012-05-06
I have a Cisco 857 router atached to an ADSL connection with a static IP address. The router is connected to an ISA server. I want the ISA server to have the External IP address, rather than a private IP which is NATed. I don't have much experience with Cisco, I've been landed with this thing and no budget to buy a simpler router, but I've been trying to set it up using SDM, unsucessfully.
How can I set up the router so that the network adapter on the server behaves as if it is directly connected to the web, with no firewall or NAT or anything?
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Question by:silent_waters
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12 Comments
 
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Expert Comment

by:lpacker
ID: 24024649
You connect to the SDM by an IP address, so you will not be able to do this without losing connectivity. You will have to disable ip routing and Cisco 857.
You should connect to the router via the console port and depending on your exact model, enter commands as:
http://www.cisco.com/en/US/products/hw/routers/ps380/products_qanda_item09186a00800949ec.shtml#q1
 
 
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Author Comment

by:silent_waters
ID: 24030316
Ok, making some progress i think. I've set up as advised, and am now getting an error: *Mar  1 01:57:37.559: %TBRIDGE-4-NOVCFLOOD: No VC's configured for bridging on ATM0
Not quite sure what this means, but if I do a show bridge I can only see the ethernet port in the list for bridge 1, even though i have tried to add ATM0 a couple of times.
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Expert Comment

by:trbooth
ID: 24030327
You will want to do this connecting through the console port.

What lpacker mentioned may be one way to do it, however, I personally would prefer to keep routing on the device and just use static NAT:

Issue these commands:

ip nat inside source static <server_ip> interface Dialer0

## assuming you're using a dialer0 interface for the DSL
interface Dialer0
 ip nat outside

## assuming you're using VLAN1 for the switched/bridged interfaces
interface VLAN1
 ip nat inside
0
 

Author Comment

by:silent_waters
ID: 24030328
Running config is atached.
Current configuration : 1088 bytes

!

version 12.4

no service pad

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname wlcerora

!

boot-start-marker

boot-end-marker

!

!

no aaa new-model

!

!

no ip routing

!

!

no ip cef

ip auth-proxy max-nodata-conns 3

ip admission max-nodata-conns 3

!

!

!

!

!

archive

 log config

  hidekeys

!

!

!

!

!

interface ATM0

 no ip address

 no ip route-cache

 no atm ilmi-keepalive

 pvc 0/38

  encapsulation aal5mux ppp dialer

  dialer pool-member 1

 !

 dsl operating-mode auto

 bridge-group 1

!

interface FastEthernet0

!

interface FastEthernet1

!

interface FastEthernet2

!

interface FastEthernet3

!

interface Vlan1

 no ip address

 no ip route-cache

 bridge-group 1

!

interface Dialer0

 no ip address

 encapsulation ppp

 dialer pool 1

 ppp authentication chap callin

 ppp chap hostname zen179208@zen

 ppp chap password 0 q2aquZp7

!

ip forward-protocol nd

!

no ip http server

no ip http secure-server

!

!

control-plane

!

bridge 1 protocol ieee

!

line con 0

 no modem enable

line aux 0

line vty 0 4

!

scheduler max-task-time 5000

end

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Author Comment

by:silent_waters
ID: 24030362
thanks trbooth, but I don't want to use NAT, it complicates things later on.
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Assisted Solution

by:trbooth
trbooth earned 50 total points
ID: 24031622
No problem. Evidently I can't read.
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Expert Comment

by:lpacker
ID: 24034779
I only see one interface in the bridge-group. You need to have the ISP connection and the port that the server is plugged into in the same bridge-group.  If I am not mistaken, without routing, the vlan interface isn't doing you any good.
I see multiple fast ethernet ports listed, do you have multiple machines connected?
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Author Comment

by:silent_waters
ID: 24034867
I've tried to add the ATM interface, but it doesn't appear. I'm not sure why, it doesn't give an error message when I use the command, it just doesn't do anything.
I only have one server to connect, but the router is a fixed configuration job with four ports. The fastethernet interfaces can't be added to the bridge group, so i added the vlan instead.
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LVL 4

Assisted Solution

by:lpacker
lpacker earned 100 total points
ID: 24035125
Are you able to configure a BVI interface?
Try this:
http://www.ciscopress.com/articles/article.asp?p=31445
Search for this text :   RFC 2684 Bridging

 
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Author Comment

by:silent_waters
ID: 24035426
Wouldn't that basically be the same as routing? It has private IP addresses on the internal network, which is what I want to avoid.
0
 

Author Comment

by:silent_waters
ID: 24035459
Why is this so difficult? Is there a different type of dsl modem I need to buy or what? It can't be this much hassle to get a public IP address onto a server network adapter.
Does anyone have any suggestions about alternatives? I really need to get this sorted asap.
0
 

Accepted Solution

by:
silent_waters earned 0 total points
ID: 24091835
I've given up. I'm going to do it another way.
Thanks for the help anyway guys.
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