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On my LAN network 192.168.0.x. My computer is linked to a small Netgear router 192.168.0.19.

On some ping requests, I get an answer from the router, not from the actual server. On several requests targeting the same server, I might even get responses from both.

Example:

c:\>ping 192.168.0.17
Reply from 192.168.0.17: bytes=32 time=1ms TTL=225

c:\>ping google.com
Reply from **192.168.0.19**: bytes=32 time=1ms TTL=225

c:\>ping something_outside_the_Lan_that_do_not_answer_to_ping
Reply from **192.168.0.19**: bytes=32 time=1ms TTL=225

c:\>ping something_INside_the_Lan_that_do_not_answer_to_ping
Destination unreachable

Why is that? How can .19 answers "OK" ?

enter image description here

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Can you actually ping 192.168.0.19 instead of a hostname that apparently resolves to that address? This looks like a DNS issue. –  Chris McKeown Jul 15 '12 at 22:08
    
@Chris: no, 192.168.0.19 won't reply to ping. And I don't think any hostname is resolving to that address. It does not appear in my question, but google.com and all other things resolve to their respective IP. –  oldbrazil Jul 15 '12 at 22:18
    
I'm confused now. In your information above, pinging google.com shows a reply from 192.168.0.19. EDIT: Never mind, I see what you're getting at. What is your router using for it's DNS service? –  Chris McKeown Jul 15 '12 at 22:21
    
Yes Chris, you're confused exactly as I am. Pinging Google gets me an answer from that tiny GS105E. It has no DNS configured. I've added a screenshot from its config ... –  oldbrazil Jul 16 '12 at 1:40
    
There should be somewhere that shows which DNS servers the Netgear is using. Also could you post an ipconfig from your system? –  Chris McKeown Jul 16 '12 at 7:13

1 Answer 1

Well, I upgraded the firmware to the newest found version, and that strange behaviour stopped. The netgear GS105E doesn't answser the pings to other devices anymore.

So it was probably a bug. [I'm not sure about the details of the ping protocols, but the former behaviour of the router obviously defeat its purpose]

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Please accept this answer so it doesn't show up in the list of unanswered questions –  Mike Pennington Jul 17 '12 at 3:18

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