When I run either of those on either of the two machines, it is trying to resolve against the DNS servers configured for the external addresses for the box.

Here is the result
Server:         xxx.xxx.xxx.69
Address:        xxx.xxx.xxx.69#53

** server can't find 102.1.168.192.in-addr.arpa.: NXDOMAIN

-John



On Jun 9, 2009, at 10:17 AM, Steve Loughran wrote:

John Martyniak wrote:
I am running Mac OS X.
So en0 points to the external address and en1 points to the internal address on both machines.
Here is the internal results from duey:
en1: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
   inet6 fe80::21e:52ff:fef4:65%en1 prefixlen 64 scopeid 0x5
   inet 192.168.1.102 netmask 0xffffff00 broadcast 192.168.1.255
   ether 00:1e:52:f4:00:65
   media: autoselect (1000baseT <full-duplex>) status: active

   lladdr 00:23:32:ff:fe:1a:20:66
   media: autoselect <full-duplex> status: inactive
   supported media: autoselect <full-duplex>
Here are the internal results from huey:
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
   inet6 fe80::21e:52ff:fef3:f489%en1 prefixlen 64 scopeid 0x5
   inet 192.168.1.103 netmask 0xffffff00 broadcast 192.168.1.255

what does
 nslookup 192.168.1.103
and
 nslookup 192.168.1.102
say?

There really ought to be different names for them.


> I have some other applications running on these machines, that
> communicate across the internal network and they work perfectly.

I admire their strength. Multihost systems cause us trouble. That and machines that don't quite know who they are
http://jira.smartfrog.org/jira/browse/SFOS-5
https://issues.apache.org/jira/browse/HADOOP-3612
https://issues.apache.org/jira/browse/HADOOP-3426
https://issues.apache.org/jira/browse/HADOOP-3613
https://issues.apache.org/jira/browse/HADOOP-5339

One thing to consider is that some of the various services of Hadoop are bound to 0:0:0:0, which means every Ipv4 address, you really want to bring up everything, including jetty services, on the en0 network adapter, by binding them to 192.168.1.102; this will cause anyone trying to talk to them over the other network to fail, which at least find the problem sooner rather than later


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