Re: MIDRANGE-L Digest V4 #735

Jim:

This doesn't sound quite right, though I'm no expert at this. The advice about 
increasing the time interval is good; AFAIK that should be one of the first 
steps in resolving ping issues.

But your explanation of what you were seeing seems incomplete. I would expect 
that ping 2 would not respond to the pong from ping 1 or, by pings 3 and 4, 
you'd start getting notification of duplicate ping packets (if ping 3 showed 
timeout, then both pong 2 and 3 should arrive during ping 4) or each ping after 
the first would simply receive the reply from the previous ping (ping 1 times 
out, ping 2 sees response from ping 1, ping 3 sees response from ping 2, etc.)

Although I've seen timing issues as you describe, I've never seen the behavior 
that you saw. I had somewhere gotten the understanding that each ping packet 
had a unique (sequential?) identifier to ensure that ping 2 would not respond 
to the pong from ping 1. But your experience calls that into question. How did 
you determine what was happening in your case?

Tom Liotta

On Thu, 12 July 2001, Jim Langston wrote:

> 
> One time I was having trouble connecting to another server on our WAN, and
> Pings were showing exactly 50% drops.  That is, every other ping was timing 
>out.
> 
> So, what I did what increase the time to wait for the response on the Ping 
>command
> to like 10 seconds, and I actually saw that I was receiving every single 
>ping, just
> very slowly.
> 
> So why did I initially see every other ping?  The timing.  Pings wait 1 
>second as
> the default before timing out.  So, it would send a ping, wait one second for 
>a
> response, state it timed out, send the second ping, wait... and receive the 
> response from the first ping!  It would report this as the second ping, then 
>it
> would send the third ping, time out, send the 4th ping, and receive the 
>response
> to the third ping... 

-- 
Tom Liotta
The PowerTech Group, Inc.
19426 68th Avenue South
Kent, WA 98032
Phone  253-872-7788
Fax  253-872-7904
http://www.400Security.com


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