Class C in-addr.arpa delegation, am I doing this correctly?
Ray Van Dolson
rayvd at digitalpath.net
Sat Nov 19 01:10:24 UTC 2005
We have a /19 reallocated to us from Sprint.
Of that, I would like to delegate reverse DNS authority for a /24 to
another ISP's nameserver's.
Using the REASSIGN forms on ARIN do not work--complains about not being
Apparently our ISP (Sprint) is therefore delegating 8 /24's to us
individually since we are only receiving a /19 from them. So to
delegate a /24 from that to our customer ISP I am doing the following:
$TTL 86400 ; max TTL
@ IN SOA ns1.digitalpath.net.
2005111836 ; Serial
28800 ; Refresh
7200 ; Retry
604800 ; Expire
3600 ) ; TTL Minimum
@ IN NS ns1.digitalpath.net.
@ IN NS ns2.digitalpath.net.
$GENERATE 1-255 $.254.62.192.in-addr.arpa. NS NS01.ISP.COM.
$GENERATE 1-255 $.254.62.192.in-addr.arpa. NS NS02.ISP.COM.
$GENERATE 1-255 $.254.62.192.in-addr.arpa. NS NS03.ISP.COM.
$GENERATE 1-255 $.254.62.192.in-addr.arpa. NS NS04.ISP.COM.
(IP's changed to protect the guilty)
This seems to work with a couple oddities:
Automatic AXFR's of the zone with the GENERATE macro run does not
appear to move over to ns2.digitalpath.net (my secondary nameserver).
I am doing a dig @ns1 254.62.19.in-addr.arpa axfr > zonefile on
ns2.digitalpath.net to bring the zonefile over. The GENERATE macro is
expanded correctly here.
Reverse DNS resolution from out on the internet of one of these IP's
still doesn't appear to work. No valid IP is returned. Maybe this is
a propagation issue, so I will give it a day.
Using dnstracer -s . -c -C -o -4 22.214.171.124.in-addr.arpa shows the
NS01.ISP.COM, etc nameservers under ours, so at least that appears to
be working correctly.
Thanks for pointing out any problems.
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