Re: Realtime traceroute

From: Tony Nelson (tonynelson_at_georgeanelson.com)
Date: 07/31/05

  • Next message: Chris Ruprecht: "Re: FC4 - What is smp kernel?" 
    Date: Sat, 30 Jul 2005 22:59:26 -0400
To: <fedora-list@redhat.com>

    At 11:41 AM -0700 7/30/05, Kenneth Porter wrote:
    >Does anyone know of a realtime traceroute that can be used to show
    >anomalous routers?
    >
    >I'm having an issue while gaming in which I'll see my ping to an unrelated
    >server suddenly and momentarily spike, which tells me that some router
    >close to me is having a short-term issue. But because it's not a continuous
    >problem, I can't tell where it's happening.

    Smaller MTU for everything on the LAN might help. It would lower
    throughput some but decrease response time.

    If you're using DSL, you do know that it comes in two flavors, Interleave
    and Fast Path. Interleave has better error recovery, while Fast Path is
    lower latency. Your DSL provider would have to make the change for you.
    Some (most?) DSL modems have a utility that should tell you about various
    settings; it usually runs on MSWindows. (My modem also requires that I run
    with no firewall of any kind, so I've never tried it.)

     ...
    >BTW, my residential router is a Linksys WRT54G running Sveasoft Satori
    >Linux with QoS enabled. I'm not inclined to think that it's the problem.
    >But there might be a spike in bandwidth elsewhere in my LAN that could be
    >an issue. A measurement of packet loss at the Linksys could be useful, but
    >I don't know how to look for that and am open to suggestions.

    Try disabling the QOS stuff. Dropping packets or delaying them to throttle
    TCP is one way to implement QOS traffic shaping. (Not that it should need
    to do anything to ICMP packets, but what do I know?)
    ____________________________________________________________________
    TonyN.:' <mailto:tonynelson@georgeanelson.com>
          ' <http://www.georgeanelson.com/> 

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