stuck in a CBT Nuggets lab

inscom.brigade

I am working on a cbt Lab, all and all I am doing well, but:

The part I am stuck:

I only have the Comcast home service, I do not have my own IP address.

I checked the routing table from my wrt54g, here is my routing table.
The wrt54g that I used for my house gateway is 192.168.100.2, I guess you knew that.

This is what I get if I do a TRACERT comcast.com | from power shell/cmd

Right now my 2600's are running ripv2 I have no trouble to ping threw my t1 WAN links or my LAN.

When I try to put the ip address from my lynksys routing table into the 2651 cisco router on interface fa0/1 I can't ping the ISP. I bypassed the wrt54g and connected the cisco 2651 directly to the motorola 6120 modem.

Should I just keep trying all the numbers I guess:
I get nervious when I take down the house internet for everybody.

Did I say this clear or am I confusing you?


I have duplicated this exact topology to the "T", all numbers are exact except for Jeremy's E0/1, & his ISP.

My R1 isp side is fa0/1, no E0/0

Thanks for reading this.

boredgamelad

Exactly which IP address do you have on your router's fa0/1?

inscom.brigade

so far I tried:


68.34.80.0 255.255.248.0

68.34.80.1 255.255.248.0

68.34.81.246 255.255.248.0


then I had to put back my house internet.




I have not tried 68.85.139.193 but i would need to guess the mask.

DPG

Set your fa0/1 interface to use DHCP.

neotesla

+1 - that should work.

I have the same topology in GNS3, works fine. (Of course, the switch is not a simulated Catalyst, so I can use it only for routing labs). Plus I made the PC 192.168.1.50 is a VirtualBox XP machine...

inscom.brigade

that sounds like it should do it, but I can't get it to work.
Interface fastethernet 0/1 set to DHCP and it is UP UP.

shouldn't I be able to ping the dns server?





this is what I did:
R1(config-if)#ip address dhcp ?
R1(config-if)#ip address dhcp hostname comcast.com
R1(config-if)#ip ddns update hostname comcast.com
R1(config-if)#do s
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 192.168.1.1 YES NVRAM up up
Serial0/0 unassigned YES NVRAM administratively down down
FastEthernet0/1 unassigned YES DHCP up up
Serial0/1 unassigned YES NVRAM administratively down down

then i try
R1(config)#ip dhcp pool comcast.com
R1(dhcp-config)#NETWork 68.34.80.0 /21
R1(dhcp-config)#DEFault-router 68.34.80.1
R1(dhcp-config)#DNs-server 75.75.75.75 75.75.76.76

Legacy User

Do you have nat configured? You don't setup a dhcp server using the internet ip network. Use the 192.168.1.0 network in the dhcp server. Did you write down what dns servers the original router was using? If you have that info add

ip name-server x.x.x.x <--dns server address
ip name-server x.x.x.x <--dns server secondary address

I didn't need to configure rip to make it work. Try adding a route going out

ip route 0.0.0.0 0.0.0.0 fa0/1
or
ip route 192.168.1.0 255.255.255.0 fa0/1

Legacy User

inscom.brigade wrote: »

so far I tried:


68.34.80.0 255.255.248.0

68.34.80.1 255.255.248.0

68.34.81.246 255.255.248.0


then I had to put back my house internet.




I have not tried 68.85.139.193 but i would need to guess the mask.

More then likely 68.34.81.246 255.255.248.0 is your ip and 68.34.80.1 255.255.248.0 is the gateway address.