Unable to echo rostopics over network

edit

I have a workstation(hostname ubuntu) at 192.168.1.51, a machine(hostname CPR-SMIT03) at 192.168.1.105

I am able to teleop the machine with a joystick from my workstation. The publish/listener tutorial also works fine both ways.

However, I am unable to rostopic echo /tf or any other topics for that matter, despite being able to run rostopic list on the workstation.

On my machine, I could run both commands. I have read the pre-existing threads about being able to list rostopics but unable to echo them, but I they haven't helpful enough for me. Looking really for more instructive guidance.

On my workstation's .bashrc:

export ROS_IP=192.168.1.51
export ROS_MASTER_URI=http://192.168.1.105:11311

In my workstation's /etc/hosts:

127.0.0.1       localhost
127.0.1.1       ubuntu
192.168.1.105   CPR-SMIT03

On my machine's .bashrc:

export ROS_IP=192.168.1.105
export ROS_MASTER_URI=http://192.168.1.105:11311

In my machine's /etc/hosts:

127.0.0.1    localhost 
127.0.1.1    CPR-SMIT03
192.168.1.51 ubuntu

Update: running "rostopic info /tf" on both the "machine" and my workstation shows publishers and subscribers at 192.168.10.1:[various ports]. Other rostopics demonstrate the same IP address for publishers and subscribers. Does that mean anything?

Example for "rosnode info /imu/declination_compute"

Node [/imu/declination_compute]

Publications:
* /rosout [rosgraph_msgs/Log]
* /imu/declination [std_msgs/Float32]

Subscriptions:
* /navsat/fix [sensor_msgs/NavSatFix]

Services:
* /imu/declination_compute/set_logger_level
* /imu/declination_compute/get_loggers

contacting node http://192.168.10.1:36537/ ...
Pid: 2954
Connections:

* topic: /rosout
    * to: /rosout
    * direction: outbound
    * transport: TCPROS
* topic: /imu/declination
    * to: /imu_compass
    * direction: outbound
    * transport: TCPROS
* topic: /navsat/fix
    * to: /navsat/nmea_topic_driver (http://192.168.10.1:57719/)
    * direction: inbound
    * transport: TCPROS