Solved setup wrt54gr with cisco static ip

June 16, 2012 at 14:10:11
Specs: Windows Server 2003, x3200/4GB
I recently change mi ISP to optimum online. They gave me a new eros modem and a cisco 851. The switch is configured to with static IPs. I want to configure my wrt54gr router to work with one of the static IPs from the cisco router so i can connect the switch with the rest of my network. I have the wrt54gr configured to use one static ip, but i dont get internet connection.
Any ideas of what i am missing?

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✔ Best Answer
June 16, 2012 at 16:24:56
You need to configure the wrt54gr WAN interface with static ip address, default gateway and DNS server.
This WAN interface must be connected to one LAN port of the Cisco router.

The internal (LAN) configuration of the wrt54gr should match your local networks ip range, where also your server resides to.

Then, all users should have internet as well as server access.



#1
June 16, 2012 at 15:01:38
Then drop using the cisco and only connect the netgear to the modem.
no reason for you to be doing double nat.

You can't use public ips on both sides [wan and lan] of the router. This what you are trying to do.

Answers are only as good as the information you provide.
How to properly post a question:
Sorry no tech support via PM's


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#2
June 16, 2012 at 15:06:43
Is the Cisco Router/Switch running as a Router or is it running in bridge mode?

Can you change the configuration of the Cisco 851 by yourself or haven't you got the password for it?

Have you read the infos, you got from your ISP, about the IP address range you got, including the default gateway address and the DNS servers, you have to use in your configuration?


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#3
June 16, 2012 at 16:10:29
Thanks for answering wanderer.

I cannot connect to the netgear because the switch is plug-and-play, in other words no access to configuration. The cisco router is configured with static IPs and i want to configure another router with one of the static ips on the WAN side and DCHP in the lan side.
Now all computer in the network have internet access but no access to the server.
For the TCP/IP properties, I am using my own static ip for the server, but are the Subnet mask and Default gateway the same as the second router? if they are, what are my preffer.DNS servers?


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Related Solutions

#4
June 16, 2012 at 16:14:06
Hi paulsep - thanks for replying.

Yes i got the block of IPs, but no password for the cisco router. I have no authorization from Cablevision :-(

I configured another router to use one of the static IPs and now the computers have iternet connection, but no server access.
I know i need to update my server TCP/IP properties, but what are my Subnet mask, Defaul gateway or pref DNS?...Any idea?


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#5
June 16, 2012 at 16:24:56
✔ Best Answer
You need to configure the wrt54gr WAN interface with static ip address, default gateway and DNS server.
This WAN interface must be connected to one LAN port of the Cisco router.

The internal (LAN) configuration of the wrt54gr should match your local networks ip range, where also your server resides to.

Then, all users should have internet as well as server access.


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#6
June 16, 2012 at 16:37:02
yes. I have for example
IP 192.168.1.177 for static ip
Subnet mask 255.255.255.0
Default Gateway 192.168.1.1

what are the dns pref and alter?


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#7
June 16, 2012 at 16:57:05
The DNS server should also be the ip address of the wrt54gr router.
This router acts as a DNS forwarder, so it forwards DNS requests to the Cisco and the Cisco forwards the requests to the ISPs DNS server, that are configured in the Cisco router by your ISP.

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#8
June 16, 2012 at 18:29:04
Thanks so much for your help paulsep: it is good to have someone to refer to when bumping into tech issues.
ok. I did like that but it seems the ip i am using is not working anymore. I ping the the address and i get 'Hardware Error' ... i have usually seen a 'Request Time Out' or packages send from the ip, but not 'hardware error'....Any ideas?

I tried another ip but i get the same 'hardware error'

Any other idea?


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#9
June 16, 2012 at 18:42:58
From which machine are you trying to ping and what address are you pinging?

Please post the output of tracert google.com

It's also a good idea to post the output of ipconfig /all for review.


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#10
June 17, 2012 at 08:16:57
Hello paulsep - i am pinging the address from the server itself. I got the 'hardware error' then i tried and ping another ip for availability.
I will post those output as soon as i a back at work
Thanks

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#11
June 17, 2012 at 11:02:49
Hello paulsep -- no need to post anything else.

I set the server to obtain IP automatically. ipconfig and didnt get any ip so I noticed that my cable was not plugged in the right jack :( seems that someone manipulated while i was on my way from san diego and just plug it anywhere.
I plugged the cable from switch to the right jack in the server and applied your directions above about subanet and default gateway.

Everything is working fine now! I have the same static IP for my server and the new router is working perfectly fine!

Thanks so much for all your help! ... Happy Father's Day to you all


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#12
June 17, 2012 at 11:11:46
You are welcome.

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