[TriLUG] Off Topic: Need Cisco Router Config Help

Tarus Balog tarus at opennms.org
Thu Apr 3 15:51:35 EDT 2008


This is off topic, but I figure there are some Cisco gurus out there  
who can give me a hand.

We used to have a Linksys router hooked up to the Zyxel "modem" Embarq  
gave us for the DSL line, and we started to have problems, so I bought  
a Cisco 800 series router that could serve both purposes.

Although my Cisco-fu is weak, I was able to get it working pretty  
well ... except for one thing.

When I am outside the LAN, I connect to "private.opennms.com" which is  
NAT'd to a box in the office: This worked fine when I was  
using the Linksys router, but this doesn't seem to work now.  
Connections to the "private.opennms.com" address don't seem to NAT if  
we are coming in from the local network. For example, if I want to  
access http://private.opennms.com from the office, it'll fail, but it  
works fine if I do it from the internet. While in the office I have to  
set up an /etc/hosts file entry to point private.opennms.com to  
cartman (our internal file server).

And clues?


Here are the important bits of my config:

ip subnet-zero
ip cef
no ip dhcp use vrf connected
ip dhcp binding cleanup interval 600
ip dhcp excluded-address
ip dhcp pool office
    domain-name internal.opennms.com
ip domain name opennms.com
ip name-server 63.xx.yy.zz
bridge irb
interface ATM0
  no ip address
  no atm ilmi-keepalive
  pvc 8/35
   encapsulation aal5snap
  dsl operating-mode auto
  bridge-group 1
interface FastEthernet0
interface FastEthernet1
interface FastEthernet2
interface FastEthernet3
interface Vlan1
  ip address
  ip nat inside
  ip virtual-reassembly
interface BVI1
  ip address 63.x.y.z
  ip nat outside
  ip virtual-reassembly
ip classless
ip route 63.x.y.z
no ip http server
no ip http secure-server
ip nat inside source list 1 interface BVI1 overload
ip nat inside source static tcp 80 interface BVI1 80
bridge 1 protocol ieee
bridge 1 route ip

Tarus Balog, OpenNMS Maintainer             Main:   +1 919 533 0160
The OpenNMS Group, Inc.                     Fax:    +1 503 961 7746
Email: tarus at opennms.org                    URL: http://www.opennms.org
PGP Key Fingerprint: 8945 8521 9771 FEC9 5481  512B FECA 11D2 FD82 B45C

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