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Ping basics

Posted on 2012-03-21
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Last Modified: 2012-06-27
I was given a list of public IP addresses for servers in the DMZ (approx 10). I was asked to try a ping from outside the network to ensure I get a response. Can I ask a very basic (please keep answers basic) question - if you ping one public IP address, often you "get a response from" a totally different IP address. Why would that be. The servers are either related to mail, websites or citrix.
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Question by:pma111
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rowansmith earned 1000 total points
ID: 37746553
What does the actual response look like?  Can you paste here?  Feel free to obscure the first number of the IP addresses if you like.
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by:pma111
ID: 37746579
C:\>ping xx.xx.xxx.xx2

Pinging xx.xx.xxx.xxx with 32 bytes of data:

Reply from xx.xx.xxx.xx0: bytes=32 time=9ms TTL=240
Reply from xx.xx.xxx.xx0: bytes=32 time=9ms TTL=240
Reply from xx.xx.xxx.xx0: bytes=32 time=9ms TTL=240
Reply from xx.xx.xxx.xx0: bytes=32 time=9ms TTL=240

Ping statistics for xx.xx.xxx.xx2:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 9ms, Maximum = 9ms, Average = 9ms
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by:greensuman
greensuman earned 1000 total points
ID: 37746586
Hi,

i hope there may be some NAT  (Network Address Translation) has been done to reach the DMZ servers. due to that your getting some different ip address

Thanks
greensuman
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Expert Comment

by:rowansmith
ID: 37746615
Heh, you've probably hidden a bit to much information....

But the Firewall could be responding, it could be that the IP address is a secondary and the primary address is responding.  There are actually quite a few reasons why this could occur.

It could also be a NAT issue with the Firewall, not rewriting the IP address inside the PING packet...

You'd need to put a network analyser on to figure out exactly why it is happening.
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