Solved CCENT Episode 110 Intro to Routing - Static Route Question

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Hi, This may be an ultra beginner question but I have to ask...

In CCENT Episode 110, Intro to Routing, at 59:30, Don enters an IP in Router 2 to get back to Router 1. My question is, why was it entered as the IP on Interface 2 of R1 instead of the IP on Interface 1 of R2 (the router he was on)?

So, for example, on R2, he entered: ip route 172.19.1.0 255.255.255.0 51.17.33.221

That 51.17.33.221 is the IP on Interface 2 of R1. Could he have accomplished the same thing by entering any of the following...

ip route 172.19.1.0 255.255.255.0 51.17.33.43 (same network but it is the interface directly on R2)

or...

ip route 172.19.1.0 255.255.255.0 Fa0/0 (once again, same network but this is the interface on R2 which is directly connected)

I hope this makes sense. I guess you'll have to revisit that episode to understand what I am asking.

Thanks for the knowledge!

@John-Gasperin

Interesting that in the very next episode, he does just that. He states that the route was put in like this...

ip route 172.19.1.0 255.255.255.0 51.17.33.43

So, my guess is that any of these options would work (?) Is there a preference as to the proper way to do it?

@John-Gasperin,

In your first question!
My question is, why was it entered as the IP on Interface 2 of R1 instead of the IP on Interface 1 of R2 (the router he was on)? Right at 59:30, Don physically changes to R2 when he mentions switching the console port. If you look at the lines on the screen... you'll see he presses enter a few times and the line switches to R2

In the second question!

Could he have accomplished the same thing by entering any of the following...
ip route 172.19.1.0 255.255.255.0 51.17.33.43 (same network but it is the interface directly on R2)
or...
ip route 172.19.1.0 255.255.255.0 Fa0/0 (once again, same network but this is the interface on R2 which is directly connected)

ip route 172.19.1.0 255.255.255.0 51.17.33.43 would only work if he were on R1 but it will not work from R2.

ip route 172.19.1.0 255.255.255.0 Fa0/0 will work because you can send it out the interface regardless of the IP address.

@John-Gasperin said:

@John-Gasperin

Interesting that in the very next episode, he does just that. He states that the route was put in like this...

ip route 172.19.1.0 255.255.255.0 51.17.33.43

So, my guess is that any of these options would work (?) Is there a preference as to the proper way to do it?

Note here, Don is now on R1 and creating a static route to 172.19.1.0 through 51.17.33.43 (R2's interface).

hope this helps

@Ronnie-Wong Ok, this makes sense. Sorry, I didn't notice that he had switched to the other router. Thanks Ronnie!