The majority of my systems are hard coded IPs so my default setting is -dns=ip in hobbitlaunch.cfg for bbtest-net to cut down on actual DNS traffic. There is still the occasion to need to use 0.0.0.0 when testing connectivity and other settings via CNAMED hosts.
Requires a simple code change of bbtest-net.c
Line 788 (or there abouts, depending on what version you are using) is this line.
if (!h->testip && (dnsmethod != IP_ONLY)) add_host_to_dns_queue(h->hostname);
change it to this
if ((!h->testip && (dnsmethod != IP_ONLY)) || (strcmp(h->ip, "0.0.0.0") == 0)) add_host_to_dns_queue(h->hostname);
and you will still be able to do -dns=ip and still do DNS searches on those systems that require a DNS lookup.
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