[ros-users] Running Roscore without internet

[Ken Conley]

Hi Alexis,

Personally, I'm stumped. This doesn't appear to be just a ROS network
configuration issue. For some reason, your machine appears to be unable to
resolve localhost, which should work even when you're not connected. I'm not
aware of any reason why your ROS should work when you are plugged in versus
unplugged, if in both cases you are using 'localhost'. Is it the case that
you can ping localhost even when you're not connected?

 - Ken

On Mon, May 10, 2010 at 3:20 PM, Alexis Cheng <acheng_1221 at hotmail.com>wrote:

>  Hi Ken,
>
>
>
> I changed ROS_IP to 127.0.0.1, but the problem is persisting. Are there any
> steps/procedures to ensure the proper network configuration for
> ROS besides those outlined in the wiki?
>
>
>
> Thanks!
>
>
>
> Alexis Cheng
>
> Electrical Engineering
>
> University of British Columbia
>
>
> Hi Alexis,
>
> For some reason 'localhost' isn't resolving on your machine. I would
> recommend trying using
>
> ROS_IP=127.0.0.1
>
> instead of ROS_HOSTNAME=localhost. NOTE: this will disable your ability to
> connect to remote machines with ROS.
>
>  - Ken
>
>
> On Mon, May 10, 2010 at 3:09 PM, Alexis Cheng <acheng_1221 at hotmail.com>
> wrote:
>
>> Hi all,
>>
>> I have installed ROS on a single Ubuntu machine and it seems to be working
>> while connected to the internet. However, roscore is unable to run without
>> internet connection. Roswtf does not return any errors or warnings.
>>
>> -----
>>
>> Roscore responds with:
>>
>> [ERROR] 1273528178.429037000: [registerService] Failed to contact master
>> at [localhost:11311]. Retrying...
>>
>> Rosrun responds with:
>>
>> Couldn't find an AF_INET address for [localhost]
>> [ERROR] 1273528740.753778000: [registerPublisher] Failed to contact master
>> at [localhost:11311]. Retrying...
>>
>> -----
>>
>> I have went through the network setup document on ROS wiki and it seems to
>> pass the tests. I have also changed ROS_HOSTNAME to localhost.
>>
>> Has anyone encountered this problem before and managed to correct it?
>>
>> Thanks!
>>
>> Alexis Cheng
>> Electrical Engineering
>> University of British Columbia
>>
>>
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