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Getting inconsistent ping reply from 2 VLAN join together

Posted on 2007-04-02
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Last Modified: 2008-12-06
I have 2 network segment 10.5.0.0 and 10.10.0.0 that has 2 vlan. Both vlan are join together. When I ping 10.10.0.42 from 10.5.0.0 vlan, I kept getting inconsistent reply like below:-

C:\Documents and Settings>ping 10.10.0.42

Pinging 10.10.0.42 with 32 bytes of data:

Reply from 10.10.0.45: bytes=32 time=2ms TTL=99
Reply from 10.10.0.23: bytes=32 time=4ms TTL=99
Reply from 10.10.0.24: bytes=32 time=3ms TTL=99
Reply from 10.10.0.23: bytes=32 time=5ms TTL=99

Ping statistics for 10.10.0.42:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 2ms, Maximum = 5ms, Average = 3ms

Please advise what is the problem.

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Question by:ghgan
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by:Don Johnston
ID: 18835570
Four pings sent, four replies received. 2-5ms response time.

I don't see the problem.
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by:lrmoore
ID: 18836254
Ditto. I don't see any inconsistencies.
Try running an extended ping, like 100 pings, and see what the range of response times is then.

>Both vlan are join together
Can you explain how? What kind of switches, what are you using for L3 routing between the two vlans?
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Author Comment

by:ghgan
ID: 18836822
The problem is I am getting different ip addresses instead of the standard 10.10.0.42 reply
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by:lrmoore
ID: 18836886
D'oh! I didn't even see that. Same question, how do you have these two networks/vlans connected? This looks like proxy arp replies..

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Author Comment

by:ghgan
ID: 19968697
The problem had been solved, because some network card are 10baseT are not able to auto negotiate to 10mb full duplex and some faulty switch had been replaced.

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