Debian and grub2 password reset

  • In grub boot screen type “e” for edit, and search for line starting with linux – add “init=/bin/bash” at the end
    • linux /boot/vmlinuz-version root=UUID=hex ro quite init=/bin/bash
  • Press CTRL+X to boot and execute following:
    • mount -o remount,rw /
  • enter “passwd” to change root password (or passwd username)
  • execute “sync” and make reboot

Upload files to your Cisco ASA via pscp – no password prompt

– make sure you have defined user on ASA with privilege 15
– make sure you have ssh scopy enable configured
– on your linux host enter pscp -pw <password> <filename> <username>@<ASA IP>:<location/filename>

something like: pscp -pw THISisp4ssw0rdf anyconnectfile.pkg adminusername@

if you want to use scp with password prompt use: scp anyconnectfile.pkg adminusername@

MTU traceroute and value check

check your MTU settings with

user@computer:~$ tracepath -n
1: 0.099ms pmtu 1500
1: 0.425ms
1: 0.405ms
2: 1.345ms
3: 4.111ms
4: 4.327ms
5: 192.967ms
6: 6.561ms asymm 7
7: 4.719ms asymm 10
8: 6.181ms asymm 9
9: 5.390ms asymm 10
10: 4.403ms reached
Resume: pmtu 1500 hops 10 back 54