I just finished setting this up @ the house. I'm assuming you want to do
this for config & access-list experience (or you would buy a Linksys :o)
Most often than not, the cable modem does the analog to digital transfer (so
you need this irregardless of the setup). I live in a suburb of Washington
DC & we have digital to the demark outside in the yard, with analog
terminating @ the modem here inside the house. I used a twin Ethernet 3101
router with 2500 Series IP/Firewall IOS. I'm running NAT inside overload,
which is better know as PAT. I have a 254 address block on the inside, that
can travel under the one global IP I have (although I never have use for
more than two).
Firewall#sh run
Building configuration...
Current configuration:
!
version 12.0
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Firewall
!
enable password Cisco
!
ip subnet-zero
ip name-server 24.xxx.xxx.33
ip name-server 24.xxx.xxx.34
!
!
!
interface Ethernet0
ip address 10.1.1.1 255.255.255.0
no ip directed-broadcast
ip nat inside
!
interface Ethernet1
ip address 24.xxx.xxx.72 255.255.255.0
no ip directed-broadcast
ip nat outside
!
ip default-gateway 24.xxx.xxx.1
ip nat pool Molly 24.xxx.xxx.72 24.xxx.xxx.72 netmask 255.255.255.0
ip nat inside source list 1 pool Molly overload
ip classless
ip route 0.0.0.0 0.0.0.0 24.xxx.xxx.1
!
access-list 1 permit 10.1.1.0 0.0.0.255
!
line con 0
transport input none
line aux 0
line vty 0 4
password Phil
login
!
end
I hope this helps
Phil
Phil
----- Original Message -----
From: Tim Roberts
To:
Sent: Saturday, April 21, 2001 5:31 PM
Subject: Cisco 4000 behind a cable modem [7:1498]
> I just had cable internet access installed. I want to put a 4000 (with a
> 6-port ethernet module) between the cable modem and my network. The cable
> service only does dynamic addressing at this point. Every few weeks, I
will
> get a new IP address. The IP address is grabbed by the PC not by the
cable
> modem. So in order to put the 4000 between the cable box and my network,
I
> will need one of the ethernet ports to grab an IP from the DHCP server. I
> cannot remember if there is a way to make an ethernet port do this. Can
> someone help me out with this or recommend another way to perform this
task.
> Thanks
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