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router_to_router_ssh [2023/05/23 18:03] – [Example] -changed subhead to "Usage example" hogwildrouter_to_router_ssh [2024/10/31 22:39] (current) – [Setting up/Establishing a Tunnel] hogwild
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 FreshTomato includes [[https://matt.ucc.asn.au/dropbear/dropbear.html|Dropbear]], an SSH client/server program. Dropbear can generate an encryption KeyPair that offers passwordless connections. A command is run on the primary router which generates a public key.  That Public Key must then be entered into the secondary router’s //Authorized Keys //field, in the SSH Daemon section of the [[:admin_access|Admin Access]] menu.\\  \\ This can be useful, for example: FreshTomato includes [[https://matt.ucc.asn.au/dropbear/dropbear.html|Dropbear]], an SSH client/server program. Dropbear can generate an encryption KeyPair that offers passwordless connections. A command is run on the primary router which generates a public key.  That Public Key must then be entered into the secondary router’s //Authorized Keys //field, in the SSH Daemon section of the [[:admin_access|Admin Access]] menu.\\  \\ This can be useful, for example:
- 
-  * When the the secondary router system doesn't maintain a system clock, and time-sensitive jobs must be scheduled. 
-  * For running scripts on the secondary router using any supported commands. 
-  * As seen below, for switching wireless radio(s) on or off on a schedule (not shown). 
  
  \\  \\
 +
 +  * When the the secondary router system doesn't maintain a system clock, \\ and time-sensitive jobs must be scheduled.
 +  * For running scripts on the secondary router using supported commands.
 +  * As seen below, for switching wireless radio(s) on/off on a schedule (not shown).
 +
 +===== Setting up/Establishing a Tunnel =====
  
 Follow these steps to generate a Keypair and establish an SSH tunnel: Follow these steps to generate a Keypair and establish an SSH tunnel:
  
-  - On the primary router (the one issuing SSH commands) generate a Keypair by typing the command: \\ "dropbearkey -t rsa -f ~/.ssh/id_dropbear" \\ \\ This will display a result similar to that shown below. Leave this window open, as you'll need it for step 2. \\ \\ {{:pasted:20210921-152323.png?744}} \\ \\  +  - On the primary router (the one issuing SSH commands) generate a Keypair \\ by typing the command:  "dropbearkey -t rsa -f ~/.ssh/id_dropbear". \\ \\ This will display a result similar to that shown below. Leave this window open. \\ You'll need it for step 2. \\ \\ {{:pasted:20210921-152323.png?744}} \\ \\ \\  
-  - Copy the Public key portion from the primary router and paste it into the “Authorized Keys” field in secondary router: \\ \\ {{:pasted:20210921-152415.png?739}} \\ \\ +  - Copy the Public key portion from the primary router and paste it  \\ into the “Authorized Keys” field in secondary router: \\ \\ {{:pasted:20210921-152415.png?739}} \\ \\ \\ 
   - In the above screenshot, a pre-existing, unrelated key was redacted. \\ \\    - In the above screenshot, a pre-existing, unrelated key was redacted. \\ \\ 
-  - Now, connect to the secondary router via an SSH session (running on the primary router).  \\ The example below uses the //nvram// command to display the hostname. \\ The first command string ("ssh root@192.168.10.1 nvram get lan_hostname")** **executes the command on the secondary router and then it [nvram get lan_hostname] is executed locally, on the primary router. \\ \\ \\ {{:pasted:20210921-152503.png?741}}+  - Now, connect to the secondary router via SSH (running on the primary router).  \\ The example below uses the //nvram// command to display the hostname. \\ \\ \\ The first command string ("ssh root@192.168.10.1 nvram get lan_hostname")** **\\ executes the command on the secondary router and then \\ it ["nvram get lan_hostname"] is executed locally, on the primary router. \\ \\ \\ {{:pasted:20210921-152503.png?741}} 
 + 
 + \\
  
  \\  \\
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 ===== Usage Example ===== ===== Usage Example =====
  
-This example will enable/disable the eth1 5Ghz WiFi interface on the secondary router. (Temperature is shown only when the interface is enabled).  \\  \\+This example enables/disables the secondary router's eth1 5Ghz WiFi interface. (Temperature is shown only when the interface is enabled).\\  \\
  
-  - This screenshot shows the status display of the Primary router before before the command is run: \\ \\ {{:pasted:20210921-152542.png?736}} \\ \\  +  - This screenshot shows the Primary router's status before the command is run: \\ \\ {{:pasted:20210921-152542.png?736}} \\ \\  \\  
-  - Now, we run the command (//ssh root@192.168.10.1 radio toggle 1//): \\ \\ {{:pasted:20210921-152607.png?744}} \\ \\  +  - Now, we run the command ("//ssh root@192.168.10.1 radio toggle 1"//): \\ \\ {{:pasted:20210921-152607.png?744}} \\ \\  \\  
-  - This shows the status display after the command is run: \\ \\ {{:pasted:20210921-152637.png?761}} \\  \\ Since "radio toggle 1" is  a toggle switch, if the same command is repeated, the eth1 interface will be disabled on the primary router.+  - This shows the status after the command is run: \\ \\ {{:pasted:20210921-152637.png?761}} \\  \\ 
 + 
 + \\ Since "radio toggle 1" is  a toggle switch, if the same command is repeated, the eth1 interface will be disabled on the primary router.
  
 \\ \\
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  \\  \\
  
- +===== Passwordless Router-to-Router SSH Notes =====
-===== Notes =====+
  
   * The SSH daemon must be enabled on both routers.   * The SSH daemon must be enabled on both routers.
   * The key generated will be erased after a reboot of the Primary router.   * The key generated will be erased after a reboot of the Primary router.
-    * Either keep a copy of the "id_dropbear" file offline (on a flash drive, or CIFS Client share) for restoration, or; +    * Either keep a copy of the "id_dropbear" file offline \\ (on a flash drive, or CIFS Client share) for restoration, or; 
-    * Be prepared to repeat (steps 1. and 2.) after a reboot, removing any redundant key from the secondary router. +    * Be prepared to repeat (steps 1. and 2.) after a reboot, \\ removing any redundant key from the secondary router. 
-  * This guide was produced using [[https://www.chiark.greenend.org.uk/~sgtatham/putty/|PuTTY]] v0.76 and FreshTomato release 2021.5. + 
-  * Inspiration was provided by [[https://blog.michael.franzl.name/2017/09/03/set-passwordless-ssh-login-dropbear-client/|this]] article.  + This guide was produced using [[https://www.chiark.greenend.org.uk/~sgtatham/putty/|PuTTY]] v0.76 and FreshTomato 2021.5. 
-  * The process was first documented [[https://www.linksysinfo.org/index.php?threads/%E2%80%9Cpassword-less%E2%80%9D-router-to-router-ssh-how-to.76761/|here]].+ 
 + Inspiration was provided by [[https://blog.michael.franzl.name/2017/09/03/set-passwordless-ssh-login-dropbear-client/|this]] article. The process was first documented [[https://www.linksysinfo.org/index.php?threads/%E2%80%9Cpassword-less%E2%80%9D-router-to-router-ssh-how-to.76761/|here]]. 
 + 
 + \\ 
 + 
 + \\
  
  
router_to_router_ssh.1684861420.txt.gz · Last modified: 2023/05/23 18:03 by hogwild

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