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This isn't really a ROS problem at all. The underlying library for resolving your hostname to an IP address isn't giving the results you expect, because you've chosen a number as your hostname.

RFC952 specifies that hostnames cannot begin with a number, but RFC1123 specifies that hostnames may be entirely numeric. This has caused some contention in the Debian community.

The bottom line is that you should choose a hostname that is not entirely numeric.

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