Can't ping router 3 Why?

Hi
I am making a GNs3 lab

I have 3 routers all the same network

r1 s0/0 172.16.1.1

r2 s0/0 172.16.1.2
r2 s0/1 172.16.1.3

r3 s0/0 172.16.1.4

if I do: show ip int brief all interfaces are up up
if I do: show cdp neighbors r1 neighbors shows r2.
r2 neighbors show r1 r3
r3 neighbors show r2
r1 can ping r2 int s0/0, & s0/1, but not r3
r2 can ping r1 but not r3
r3 can not ping any

I try:
r1(config)#int s0/0 <cr>
r1(config-if)#encapsulation hdlc <cr>
samr for r2, & r3.
!
but still no r3 ping r2.
why?
because is same network?
but I am doing Train signal ccna securety 5th video Layer 3,
we are setting up NTP and he checks connectivity and he can ping.
why?
what protocol do I need to configure?

thanks for the help
dave

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Comments

Monkerz

Might want to refigure your networks. R2 will not work with two interfaces in the same subnet.

Monkerz

Other then that:
R1 needs a route to the network between R2 and R3, or a default route.
R3 needs a route to the network between R1 and R2, or a default route.

dave dunlap

Yes well that does make sence/

BUT:

TRAIN SIGNAL video 5 layer 3 ccna security he has 3 routers configured has conectivity!

R1 172.12.12.1 ntp master
R2 172.12.12.2 ntp client

I caught um his topology and his configurations/ DO NOT match!

Yeah his r3 s0/0 is 172.12.23.3, & r2 s0/1 is 172.12.23.2
Chris Bryant, CMD is so small it was hard to cautch <what a wanker
he totaly had that hidden oh well I guess it is good Tshooting trick huh?

ok sorry to waste space here

IRONMONKUS

dave dunlap wrote: »

ok sorry to waste space here

Only the questions not asked are the ones that waste space. Good job on troubleshooting the issue. That's half the fun!