![]() Instead you type ip ssh pubkey-chain to enter the public key info for our Linux host, specify the username your connecting as and finally paste the contents of the id_rsa.pub file. ssh/authorized_keys file but…IOS doesn’t work exactly the same way. In the Linux world normally you would run the ssh-copy-id command to automatically copy your id_rsa.pub to the remote system’s. Cisco-R01(config)#username the-packet-thrower secret 5 $1$oUIV$p3rmC/HYhQVKx1I7LSuC87 This will actually work without adding the username to the router but you may with to do so in case something goes wrong. % Generating 2048 bit RSA keys, keys will be non-exportable. Cisco-R01(config)#ip ssh version 2Ĭisco-R01(config)#crypto key generate rsa modulus 2048 % You already have RSA keys defined named. Ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQD12ova0R9sMotadxOtlaguKnNozhNTABX8lXRtwfDufmZt3HZk5Zk3K8BFSg6H3dcW/元qShfTMge7KgiBxWiMh/E9JdGPAp7H6rzX4bFbZ9ESnWGafcRZM3ENDiZC5SAzyc/9rfpK7zupp//cSIS9H6HX4z47xcvCZeVQqLOBnRLwtexuVvl+GpEw5e1JDVNeroA/z6S8/ujsv2wgHq4S+u8KEcZe2QV+2bG1eimSzOLgi9wjQClfOmI+JpkOY+xUMj9ZbCTtYJ3/1KOMHRK5lfKajK6ulJZYlxN+qbOFH圓PUUeTHfTUfhUFED8nEiz6mJGaxsFE0ySn021ahPoh the Cisco router we want to create a user and make sure the router has SSH enabled so I’m going to regenerate its keys while I’m at it. Have a look at the id_rsa.pub file, we will need to add this to the Cisco router in a little bit so keep it handy. ssh folder in their home directory there should be some rsa files if there wasn’t any before. Your public key has been saved in /home/the-packet-thrower/.ssh/id_rsa.pub.ĥ4:64:5e:f8:ab:26:ef:be:7f:3c:ba:49:df:51:f6:8b key's randomart image is: Your identification has been saved in /home/the-packet-thrower/.ssh/id_rsa. ![]() ~]$ ssh-keygen -t rsa -b 2048Įnter file in which to save the key (/home/the-packet-thrower/.ssh/id_rsa):Ĭreated directory '/home/the-packet-thrower/.ssh'.Įnter passphrase (empty for no passphrase): Log onto the Linux box using the username you want to connect to the router with and run the ssh-keygen command, I included some extra switches to force it to be a 2048 bit key but that is default on Centos 7 anyway. I’ll be using Centos 7 for this but the steps are pretty much the same across the board. In the Linux world it is possible to SSH to a trusted server by using public key authentication rather than by using the standard username/password and as it happens Cisco IOS devices also allow this neat trick.įirst lets look at how to get prep a Linux host to connect to a router. If there is sensitive information that must be conveyed in order to provide a complete picture of the scenario you're facing, please let us know and we will set up a secure upload mechanism that can be used.How to log into a Cisco router without using a password is a question as old as time or at least it is something I thought might make a neat topic! Please redact sensitive information that would not be appropriate for email communication prior to sending the requested information. ![]() NOTICE: The requested troubleshooting data may include sensitive information (usernames, passwords, publicly-accessible host names or IP addresses, etc.). Since trace options can contain sensitive information, feel free to send it as an attachment via email to Please reference " Attn Brenda - Forum Thread #12755" in the subject line.
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