Reverse PTR when WAN is Down

Ephraim Silverberg ephraim at
Wed Oct 16 11:05:06 UTC 2002

When the WAN is down, reverse-ptr does not work even between local hosts
since the resolver is looking for a server for IN-ADDR.ARPA despite the
fact that all the information for local hosts is available from the LAN
nameserver.  Any idea how I can get reverse-ptr resolution for local hosts
to work even when the WAN is down?

Our named (version 8.2.3-REL) reverse-ptr data file starts out like this:

    $TTL 604800
    @       IN SOA (
            2002101602 ;Serial
            86400      ;Refresh
            21600      ;Retry
            1209600    ;Expire
            604800    );Minimum
            IN      NS
            IN      NS
            IN      NS
            IN      NS
    $ORIGIN 0.65.132.IN-ADDR.ARPA.
    1       IN PTR
    31      IN PTR
    78      IN PTR

Any assistance would be appreciated.
Ephraim Silverberg, CSE System Group,        Phone number:    972-2-6585521
Hebrew University, Jerusalem, Israel.        Fax number:      972-2-5617723
WWW:       E-mail: ephraim at

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