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router_to_router_ssh [2023/05/24 02:08] – [Notes] -changed subhead to "Passwordless Router-to-Router SSH Notes" hogwildrouter_to_router_ssh [2025/10/17 18:38] (current) – [Passwordless Router-to-Router SSH Notes] 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 =====+===== 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.
  
 \\ \\
  
  \\  \\
- 
  
 ===== Passwordless Router-to-Router SSH Notes ===== ===== Passwordless Router-to-Router SSH 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 r2021.5. 
-  * 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.1684890508.txt.gz · Last modified: by hogwild

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