RE: Cadence is completely off the net!!!

From: Michael McNamara (mac@verisity.com)
Date: Thu Apr 22 2004 - 16:35:29 PDT

  • Next message: Dave Rich: "RE: Cadence is completely off the net!!!"

    -- On Apr 22 2004 at 12:01, Kurt Baty sent a message:
    > To: Btf@boyd.com, etf@boyd.com, ptf@boyd.com, 1364@accellera.org, kurt@wsfdb.com
    > Subject: "Cadence is completely off the net!!!"
    > Cadence is completely off the net!!!
    >
    > I don't mean that they are down,
    > I mean that they have NO ROUTE TABLE ENTREES!!!
    >
    >
    > mail someone @cadence.com
    >
    > try to get:
    > http://www.cadence.com/
    >
    >
    > wow
    >
    > kurt

    Looks good now.

    I suspect they are changing their ISP.

    Looking at their start of authority record, you see:
    % nslookup
    ...
    > set query=soa
    > cadence.com
    Server: ns.cadence.com
    Address: 158.140.1.253

    cadence.com
            origin = ns.cadence.com
            mail addr = hostmaster.cadence.com
            serial = 2004022406
            refresh = 7200 (2H)
            retry = 225 (225)
            expire = 604800 (1W)
            minimum ttl = 900 (15M)
    cadence.com nameserver = auth00.ns.uu.NET
    cadence.com nameserver = ns.cadence.com
    ns.cadence.com internet address = 158.140.1.253
    auth00.ns.uu.NET internet address = 198.6.1.65
    >

    Key bits here is that the refresh is set to two hours, and retry to
    3.75 minutes, and ttl is set to just 15 minutes.

    Basically this means that the distributed servers have to keep
    checking with ns.cadence.com to get new values for the addresses.

    More stable companies :-) like verisity set these to values in many
    minutes or hours:

    > verisity.com
    Server: watson.verisity.com
    Address: 216.216.10.41

    verisity.com
            origin = watson.verisity.com
            mail addr = postmaster.watson.verisity.com
            serial = 2860260816
            refresh = 3600 (1H)
            retry = 1200 (20M)
            expire = 3600000 (3600000)
            minimum ttl = 21600 (6H)
    verisity.com nameserver = watson.verisity.com
    verisity.com nameserver = carmel.verisity.com
    watson.verisity.com internet address = 216.216.10.41
    carmel.verisity.com internet address = 212.150.223.1

    >

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