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In the previous video, We already create a
script to looping in the list ip address.

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So here we have a list that save the ip address
of all router, and then we do looping to this list.

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But if you remember, the ip address of loopback
is same on all router, which is 10.5.1.1.

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Now, we are going to modify this script, so
the last number in the loopback ip address

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will based on the last number in the router
ip address.

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Here we have the ip address list of all router,
so we will use the last number,

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which is 1 2 3 4 and 5.

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And then this last number will used in the
loopback ip address.

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How we can do that?

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Let’s try it in the python interpreter first.

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Copy this, go to terminal, and then go to
python interpreter.

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Let’s clear this using ctrl + l. and then
paste the script.

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Let’s print the list_ip,

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Okay this is the list.

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Let’s try to looping here, for ip in list_ip,
and then print the ip,

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Here we get the ip address of all router,
10.1, 10.2, 10.3, 10.4, and 10.5.

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Here we can see that the data type of each
ip address is tring, here we have a quote,

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this is means string.

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Let’s check it, up arrow until we see the
looping again, and then here let’s print

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the type of ip.

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Here we can see that the type is string.

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In the string, we have method split, this
method will split the string become a list.

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Let’s try it,

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For ip in list_ip, and then let’s try to
split this ip, ip_split, this is just a variable,

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And then ip.split(“.”), this is means
that we split the ip based on dot .

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So the result will be a list, 10 10 10 and
then 1, let’s print the ip_split here.

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Enter 2 times,

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Okay this is router 1, this is router 2, this
is router 3, this is router 4, and this is router 5.

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Okay so now we can access the last number
using indexing.

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In python, the index is started by 0, so here
0 1 2 3, so the index of last number is 3,

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or we also can use reverse indexing

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Reverse indexing is start from the last item,
the index of last item is -1.

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Okay now let’s try to print the last number.

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For ip in list_ip, ip_split ip.split dot,
and then let’s print the ip_split index 3,

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Or you can also using reverse indexing, so
the index will be -1.

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Enter 2 times,

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Okay here we get 1 2 3 4 and 5,

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We will use this number as the ip address
of loopback interface, so the ip address of

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loopback interface for each router will be
different.

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Now let’s back to sublime, here let’s
take the last number of the ip address like

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we already do in the python interpreter.

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Router_id, this is just a variable, you can
use anything.

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And then ip.split, dot, so we split the ip
based on dot.

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And then here let’s access the index -1,
which is the last item.

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Next, let’s configure for loopback5,

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The ip address is 10.6 and then here will
be based on router_id, so we use f string,

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And then here router_id.

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Okay save, back to therminal, exit from interpreter,

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And then here let’s execute
the script, python paramiiko_looping_list.py,

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enter enter here,

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Okay here we success on router 1, the ip address
is 10.6.1.1,

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Router 2 also success, the ip address is 10.6.1.2,

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Router 3, also success, the ip address is 10.6.1.3,
this is 3.

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Router 4 also success, this is 4.

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And last, router 5 also success, this is 5.

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Okay I think enough for this video

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Thankyou for watching and see you on the next video.