cache only server best practice

Discussion in 'DNS Server' started by ck, Mar 11, 2008.

  1. ck

    ck Guest

    I understand the benefits of using caching only servers for security and
    performance in your dns infrastructure. As I undersatnd it, the idea is you
    point your internal dns servers to the cache only servers and then configure
    the cache only servers to forward to your ISP DNS servers or root servers?

    How then does the cache only server at the remote office resolve internal
    names since it is forwarding to the internet?

    Also Ive heard that the dns cache is dumped when you reboot that server. If
    this is true, is there a way to create an array of cache only servers?

    ck, Mar 11, 2008
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  2. Read inline please.

    You can forward to your ISP, you cannot use the Root servers as forwarders.
    Many routers have the capability of performing a cache only DNS service, if
    your router is one of these, you simply use your router as the forwarder.
    Cache only DNS servers typically have no zones and cannot resolve internal
    names, unless you configure the cache only server with a conditional
    forwarder or stub zone for the internal domain.
    The cache is dumped when the DNS service or if the Server is restarted. In
    any case, by default Microsoft DNS servers will only retain cached records
    for up to 1 day of the remaining TTL. You will find the most records have a
    TTL of much less than one day anyway, so it really doesn't make a big
    difference. The only difference might be for NS records which usually have a
    TTL of no more than two days.

    Best regards,
    Kevin D. Goodknecht Sr. [MVP]
    Hope This Helps

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    Kevin D. Goodknecht Sr. [MVP], Mar 11, 2008
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