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IP Configuration Problem

Posted on 2003-03-24
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Last Modified: 2013-11-30
i have a small network which I setup behind a router. All the clients and server can access the Internet and ping each other. The problem im facing now is that im not able to ping my internet server using its public IP given by the ISP. (by the way, my server have a private and public ip)

how do i troubleshoot such issue?
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Question by:dennifong
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10 Comments
 
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Expert Comment

by:andrewharris
ID: 8193898
What kind of router are you using?

Normally, small home routers have a setting which disables ping responses on the public side.

Andrew
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Author Comment

by:dennifong
ID: 8194107
im using compex SKW811 wireless router. It is a small router but i dont see there is any setting which lets me disable the ping responses.

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by:dennifong
ID: 8194130
im using compex SKW811 wireless router. It is a small router but i dont see there is any setting which lets me disable the ping responses.

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by:GrindCrusher
ID: 8197319
First question:
 What do you mean your server has a public and a private IP. Do you mean that you have 2 NICS with differant addresses on them ?

Is the Server behind the router ? If so why are you running a public address behind a router running NAT ?

If your trying to "open" up your server for games, web, FTP, etc behind a router w/ NAT then best to just do port forwarding
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by:andrewharris
ID: 8216933
GrindCrusher,

He is saying that the router is a broadband wireless router. It plugs into the ADSL, cable modem. It then assumes the Public IP address as well as a private IP Address so it can communicate with the Private Network, ie it routes between the private and public addresses.

Anyway...I miss read what you originally said dennifong. I now am guessing that you cant ping any public side IP Address?

If so, it sounds like the router is blocking inbound ping responses.

Can you get me some links to the manuals for this router?

Andrew
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Expert Comment

by:GrindCrusher
ID: 8219220
He specically says his server has public and private. That is what I was looking for clarification on... Im very familiar with how NAT works.

From what I gather  he is using a public IP behind the router, the router is translating public to private address so any clients and the router wouldnt know how to arrive at his "public" address on the server.

What would make this easier is if we had an IP topology layout of all the devices involved
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Expert Comment

by:supertw2000
ID: 8229611
ICMP might not be enabled if 2K look under services and enable it
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by:CleanupPing
ID: 9152933
dennifong:
This old question needs to be finalized -- accept an answer, split points, or get a refund.  For information on your options, please click here-> http:/help/closing.jsp#1 
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by:juliancrawford
ID: 10088590
No comment has been added lately, so it's time to clean up this TA.
I will leave the following recommendation for this question in the Cleanup topic area:

PAQ with points refunded

Please leave any comments here within the next seven days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

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