Connect to Cisco device with USB cabel on linux

user@computer:~$ dmesg | grep tty[ 0.088345] printk: console [tty0] enabled[ 0.418156] serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A[ 5.030307] usb 1-3.1.3: pl2303 converter now attached to ttyUSB0[86188.149229] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0[86271.641530] usb 1-2: pl2303 converter now attached to ttyUSB0[86796.881771] pl2303 ttyUSB0: pl2303 converter now

SSH not working after upgrade

I upgraded ubuntu to focal 20.04 and SSH was unable to negotiate with network devices I tried to ssh on.Solution was found here, or simpy editing /etc/ssh/ssh_conf by adding following lines to the end of the file: Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbcMACs hmac-md5,hmac-sha1,umac-64@openssh.comKexAlgorithms diffie-hellman-group1-sha1,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1HostKeyAlgorithms ssh-rsa,ssh-dss

Reimage/downgrade Firepower FTD 1100/2100

I had some problems while downgrading so here are my steps. Documentation is not really clear about this, so here are the steps. from fxos, reformat systemfirepower-2110# connect local-mgmtfirepower-2110(local-mgmt)# format everythingAll configuration and bootable images will be lost.Do you still want to format? (yes/no):yes enter rommon and boot via tftprommon 1 > address 10.86.118.4rommon 2

What is my public IP – linux from CLI

As seen on garron.me wget -> wget -q -O – checkip.dyndns.org|sed -e ‘s/.*Current IP Address: //’ -e ‘s/<.*$//’ curl -> curl -s checkip.dyndns.org|sed -e ‘s/.*Current IP Address: //’ -e ‘s/<.*$//’ curl -> curl ifconfig.me lynx -> lynx -dump ifconfig.me | grep ‘IP Address’

Stop using “reload in”

Start using revert. Configure archive archive log config hidekeys path <flash|disk0>:Archives maximum 8 write-memory time-period 525600  Use configure terminal revert timer <X> Wait for <X> minutes for configuration to revert or use configure confirm for successfull implementation source, cisco documentation