Cisco PT 2 router w/ 1 modem each conencted to cloud and 1 router as ISP. R1 and R2 problem details inside thanks

[Lost & Found]

Hi,

i have 2 routers w/ 1 modem each connected to cloud then to ISP router.

So my problem is ISP router can ping R1 and R2

R1 can Ping ISP router same as R2

But the problem is R1 can't ping R2 vise versa.

Details

ISP: 1.1.1.1 /24

R1: 1.1.1.2 /24

R2: 1.1.1.3 /24

-Cloud

Modem1> Et6

Modem2> Et6

Tried:

ISP:

ip route 1.1.1.0 255.255.255.0 f0/0

ip route 1.1.1.2 255.255.255.0 f0/0

ip route 1.1.1.3 255.255.255.0 f0/0

R1 and R2

ip route 0.0.0.0 0.0.0.0 f0/0 

or

r1 - ip route 1.1.1.2 255.255.255.0 f0/0

r2 - ip route 1.1.1.3 255.255.255.0 f0/0

i think r1 message goes to ISP router  but ISP didn't route to r2.

also i configured access list permit all tcp udp and IP.

please see the attached file

thank you in advance

[Reza Sharifi]

Hi,

Can you post the config from the ISP router?

Also, you may want to disable "no ip split-horizon" on f0/0 interface of the ISP router and test again?

HTH

[Lost & Found]

ISP

Ip route

S       1.1.0.0 is directly connected, FastEthernet0/0

-----

interface FastEthernet0/0
 ip address 1.1.1.1 255.255.255.0
 ip access-group 100 out
 duplex auto
 speed auto
 ipv6 ospf cost 1

access-list 100 permit tcp any any
access-list 100 permit udp any any
access-list 100 permit ip any any
 

[Lost & Found]

Hi,

I add  no ip split-horizon but its not working