[opendds-main] publisher & subscriber hanging on hostnamebyaddr_r when using DHCP without dynamic DNS

[Will S. <wil...@ni...>]

I have been working through the examples in OpenDDS Developers Guide.

I built the subscriber and publisher in the 
DDS/DevGuideExamples/DCPS/Messenger

ran the
DCPSRepoInfo -o simple.ior

./publisher -DCPSRepoInfo file://simple.ior

./subscriber -DCPSRepoInfo file://simple.ior

All running on the same computer.

If the computer has a network connection obtained through DHCP, both the 
publisher and subscriber
hang. Connecting to them with gdb I found that they were calling 
hostnamebyaddr_r on the IP address
of the network interface obtained via DHCP. If I configure a static IP 
address instead the publisher and subscriber work as expected. Note we 
are on an isolated network with a DHCP server but no DNS
server.

Is a DNS server required whenever using DHCP?