Wrong ping times when pinging through Cisco VPN Client

sysadmin-ee
sysadmin-ee used Ask the Experts™
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Out of 200 users I have 3 who have this issue.  When connected to the corporate vpn their ping round trip is less than 15 ms to our corp offices on the East coast.  The actual time should be between 40 - 120 ms.  Not 7 - 15 ms.  All three can reach internal systems fine.  Why is it that they are getting inaccurate ping responses?  

The client OS is XP.  The VPN client is Cisco VPN.  The local lan connection is 192.168.0.x and the remote net is 10.10.x.x.  

This latency inaccuracy is disabling our network optimization client since the client thinks the computer is in the local office due to quick ping times.
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Commented:
Do these three users have anything else in common like local ISP or home network LAN configuration?
Raymond ZwartsNetwork Engineer

Commented:
ping rtt can very well be lower than 40 msec. this really depends on the connection of the client pc. So the question of mattvmotas is valid.

e.g. my normal connetion to the office is 20 msec.

You need to find a commonality between the 3 users.

Author

Commented:
The users are in California, Dallas and Chicago.  They use Belkin, Apple and Linksys routers.  They all use 192.168.x.x networks. 2 are Comcast users and one is a Road Runner user.
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Commented:
Are any of the "normal" users on Comcast or Road Runner in the same areas?

Author

Commented:
No, I don't have any other users in those areas.

Commented:
I have to agree with raymondzwarts then, they may just have that good of a connection.  

That being said, the compressions profile should not need to be applied if they are that fast.

Profiles for speed should not be based entirely on ping times anyway.  

Satellite Internet has high speeds but very high latency as well for example.
Raymond ZwartsNetwork Engineer

Commented:
I would say unless your users are experiencing a real problem I don't see any issue. It's just working as expected.

I know you would like to know the root cause ... but that might very simply be that they have a good internet connection.
Isn't it impossible to have a round trip ping time of 15ms from California to Massachusetts?
To quote Stuart Cheshire
# The distance from Stanford to Boston is 4320km.
# The speed of light in vacuum is 300 x 10^6 m/s.
# The speed of light in fibre is roughly 66% of the speed of light in vacuum.
# The speed of light in fibre is 300 x 10^6 m/s * 0.66 = 200 x 10^6 m/s.
# The one-way delay to Boston is 4320 km / 200 x 10^6 m/s = 21.6ms.
# The round-trip time to Boston and back is 43.2ms.
I do agree that i need to find out what all 3 have in common.  So far 2 have belkin routers and one has an apple extreme.  I will have them try connecting to one of our different VPNs to see what difference it makes.

Commented:
No ping time is impossible, it all has to do with how many routers they cross to get from side to the other.  If they only hit a couple routers all over fibre, then it is not ridiculous to get low ping times.

Author

Commented:
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Author

Commented:
The question wasn't well formed.

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