Re: ping delay, initial request

From: Giorgos Keramidas (keramida_at_freebsd.org)
Date: 07/12/05

  • Next message: Roman Kurakin: "Re: ping delay, initial request" 
    Date: Tue, 12 Jul 2005 16:49:25 +0300
To: Roman Kurakin <rik@cronyx.ru>

    On 2005-07-12 16:38, Roman Kurakin <rik@cronyx.ru> wrote:
    > Hi,
    >
    > I am starting to investigate some net problem and I wonder if this
    > problem seen/known.
    > The problem was observed with ce(4) (Cronyx Tau32-PCI/Lite,
    > it is not in the tree yet, but similar to cp(4)/ctau(4) devices) and
    > sppp(4).
    > If you run usual ping you will see normal delay which is much less than
    > 1sec.
    > But if you run flood ping, stop it, and run normal ping again you'll see
    > delay
    > about one sec.
    >
    > ping x.x.x.x
    > delay << 1 sec
    > ping -f x.x.x.x
    > average delay << 1 sec
    > ping x.x.x.x
    > delay ~ 1 sec
    >
    > This was seen on FreeBSD 4.11 stable.
    >
    > Any ideas? Does any body observed such behaviour in other environment?

    Is it possible that flood ping hits an icmp rate-limiting watermark and
    then every subsequent icmp packet gets penalized with a delay until a
    fair amount of time passes?

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  • Next message: Roman Kurakin: "Re: ping delay, initial request"

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