Hmm... I agree with you that you should get similar RTT with ping, I am not
sure what the problem or the issue is.
One thing I can recommend to start to troubleshoot the issue is (which I
believe you must have done this, otherwise feel free to follow my
suggestions):
1. verify again whether your NistNet table entry is correct, use
cnistnset -nR to display the current routing table. Ensure there is no
unwanted entries in your NistNet table.
2. Also check your Linux routing table, ensure you do not have multiple
route entries in the table that have the same destination. Usually, if you
have multiple interface, there are two default routing entries. Ensure only
one or no default entry. I am assuming you are using static IP address for
your interfaces. Check both at the host-A and host-B machines and your
Linux machine as well. It could be from A to B, the path passes through
NistNet
3. While doing continuous ping, try to bring the nistnet down and up; i.e.
cnistnet -d and cnistnet -u, and observe whether you see any effect on your
ping round-trip-time.
4. Change the delay from 2 ms to 30 ms and see whether you get the desired
result.
5. Try to unload and load the module again, usually it clears all entries in
the NistNet table.
Regards,
Erwin
----- Original Message -----
From: "Yan Gu" <[EMAIL PROTECTED]>
To: <nistnet@antd.nist.gov>
Sent: Sunday, July 30, 2006 4:15 PM
Subject: [nistnet] different round-trip time
Hi,
I have machine B and C connected to Nistnet router A through two network
cards and two switches in two subnets as shown below:
machine B (192.168.1.3) <-----> (192.168.1.1) Nistnet router A
(192.169.1.1) <-----> machine C (192.169.1.3)
I added the Nistnet delay as:
delay B to C: 30 ms
delay C to B: 2 ms
However, when I have machine B and C ping each other, machine B gets 32 ms
while machine C gets 2 ms. What could be wrong here? Since ping measure
round-trip time, shouldn't they get the same results?
Thanks
Yan
-Yan Gu ([EMAIL PROTECTED])
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