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Very odd ping response


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Peregrine2's Avatar
Peregrine2 Peregrine2 is offline
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25-Oct-2005, 05:47 PM #1
Very odd ping response
Can anyone tell me, that when pinging my router, I might get a ping response such as

Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=-2ms TTL=64

NOTE: This is all in the same instant, where I normaly would get one ping response. Also note that all the ping responses are MINUS ping responses, what the heck does that mean? It does not happen all the time, just sometimes when I seem to have problems.
JohnWill's Avatar
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25-Oct-2005, 06:04 PM #2
That is odd, and something I've never personally seen before. What problems are you having when this happens?
Peregrine2's Avatar
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26-Oct-2005, 01:17 AM #3
traffic, so that my net slows way down.
StumpedTechy's Avatar
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26-Oct-2005, 08:42 AM #4
Is -2ms even possible? Thats very bizzare indeed since essentially its saying it replied the ping before it even recieved it. Has the router been power cycled? Do you get the same response if your trying to ping other computers behind the router (or is this the only PC behind the router)? If you have a second PC does it get the same responses as the first PC? Is this the first time this has been noticed or is this the same behavior it has had in the past?

Usually you see this kind of output with a ping -t or (-n #) but never have I seen this from just a simple ping IP.

With network traffic have you made sure to check all of the PC's for any possible viruses? I would first make sure all PC's are clean then I would look at the router iteslf.
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Peregrine2 Peregrine2 is offline
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26-Oct-2005, 10:37 AM #5
You have seen this with a ping -t? because thats what im using. When I said a single instant I meant usually what comes back is just a single ping response. So what causes this response? Is it any type of buildup?
StumpedTechy's Avatar
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26-Oct-2005, 06:53 PM #6
well theoretically if you do a ping -t and it gets to the point of saturation it could be that your ping 1 is going out but coming back BEFORE ping 2 so then its reading out as a negative number due to the ping processing time....

Try something like this Ping -t -w 800 IP change the 800 value up and down and see if the replies change out from negative to positive with a higher wait time.
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O111111O O111111O is offline
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26-Oct-2005, 11:20 PM #7
Try ping 192.168.0.1 -l 1472 -n 50

That's max Ethernet payload, 50 packets. You should receive 50 packets.

Windows isn't smart enough to determine ICMP sequence replays. Your router/switch/hub could be duplicating outbound packets. That's why you see neg response time.

Again, try the above. Let's see what it says. You should receive ONLY 50 packets with ~11-30ms round trip. If you receive MORE, then we now that a switch is duplicated L2 frames.
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