Changing SSH port for a router

SSH by default uses port 22
on a cisco router you can change the port to another port

let's say using port 800

in this case you need to login the router and issue the command
#ip ssh port 800 rotary 1    ! this command will instruct the router SSH to use port 800 in addition to original port

then you need to tell the VTY to use the rotary group 1 so issue the command
#rotary 1

now you have to prevent the old port which is 22 from being used for SSH connection and that's can be done by ACL, so let's create ACL that will permit the port 800 and deny any other

#ip access-list extended SSH
#permit tcp any any eq 800
#deny   ip any any

then login to Line VTY again and issue the command #access-class SSH in
and this would apply the new ACL named SSH to the line VTY interface

you can add more flavours for the source you want to permit SSH connections.

now you can test connecting SSH using both ports and you should get connection refused for port 22 and connection via new port (800) should be ok.

QoS studying

I have finally started to study QoS, and since i have zero experience in QoS i spent some time trying to find the best study material
i have got some suggestions to study some books like End to End QoS and some other books, which i didn't read because the books start deep diving from the beginning, so what i did was searching youtube for some videos and i found Jeremy Cioara video which was so good check the link
the video i think is part of QoS for CCVP certification but definitely its good for CCIE R/S QoS part as well.


so let me list them down :

Videos
A. Jeremy Cioara  [ CCVP QoS ]
B. Keith Bogart [ INE Introduction to QoS for CCIE R/S]

Books
INE WorkBook [ great labs ]

Websites

Cisco QoS websites
Networklessons.com

Finally Go Back to INE Videos by Brian Mcgahan


searching bits and bites from here and there would do the trick for you when you are starting with something new, QoS is very important in CCIE R/S study and exam and in real networks as well, because your network always going to have some point of congestion and you need to resolve it with QoS.