Router R1 unable to ping R3 with static IPv6 routes configured.

[packet4737]

I have configured R1, R2 and R3 with IP v6 static routes and i am able to test a successful ping between Pc1 and Pc2 however the ping fails when run from either R1 or R3  however succeeds when run from R2. Also i have enabled IPv6 unicast routing on R1, R2 and R3. Where could be the problem @Flavio Miranda ?

Attached is topology and running config for R1, R2 and R3.

Thanks in Advance.

[Flavio Miranda]

Attach your project here, let me take a look.

Zip it first

[packet4737]

I have attached the screenshot and config file, check attachment. Thank

[Flavio Miranda]

I´d like to see the project. But, what you are saying dont make sense to me. If you can ping from PC you should be able to ping from router.

Have you tried use ping and put the source interface?

[packet4737]

Hello @ Flavio Miranda ,
See attached packet tracer scenario as requested for. Thanks

[packet4737]

Please see Attached.

[Flavio Miranda]

Hello @packet4737 

 As the PacketTracer seems to not allow source ping with IPV6, I fixed the problem by adding default route on both routers like this:

R1:

ipv6 route ::/0 2001:DB8:0:12::2

R3:

ipv6 route ::/0 2001:DB8:0:23::1

R1#ping 2001:DB8:0:3::100

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 2001:DB8:0:3::100, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/0 ms

[packet4737]

Hello Flavio,
Here are the results:

R3(config)#do ping 2001:db8:0:1::100
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:db8:0:1::100, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/0 ms

R1(config)#do ping 2001:db8:0:3::100
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:db8:0:3::100, timeout is 2 seconds:
.!.!.
Success rate is 40 percent (2/5), round-trip min/avg/max = 0/0/1 ms


Careful observation of the above shows success from R3 but with some
packet loss from R1 at 60%. so i think source origin pings from routers in
packet tracer could be the problem.

[Harold Ritter]

Hi @packet4737 ,

R1 only has a static route to 2001:DB8:0:3::/64 and R3 only has a static route to 2001:DB8:0:1::/64. you need to specify the source interface when you ping from R1 and R3.

R1:

ping 2001:DB8:0:3::1 source gigabitEthernet 0/1

R3:

ping 2001:DB8:0:1::1 source gigabitEthernet 0/1

Regards,

[packet4737]

Thanks @ Harold Ritter,
After testing your recommendation, i still get an error:

*R1#ping 2001:DB8:0:3::1 source gigabitEthernet 0/1*

* ^*

*% Invalid input detected at '^' marker.*

[Harold Ritter]

---

[packet4737]

Hello Harold,
Context sensitive help does not work after the source key word. instead
returns an error.

[Harold Ritter · Accepted solution]

Hi @packet4737 ,

I just realized that Packet Trace does not allow to specify the source address on the ping command.

You could add the following routes to allow R1 to ping R3 and vice versa:

R1:

ipv6 route 2001:DB8:0:23::/64 2001:DB8:0:12::2

R3:

ipv6 route 2001:DB8:0:12::/64 2001:DB8:0:23::1

Regards,

[packet4737]

Hi Harold,
Here are the results after adding the routes as advised:

R1(config)#do ping 2001:db8:0:3::100
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:db8:0:3::100, timeout is 2 seconds:
.!.!.
Success rate is 40 percent (2/5), round-trip min/avg/max = 0/0/0 ms

R3(config)#do ping 2001:db8:0:1::100
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:db8:0:1::100, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 0/2/10 ms

>From the above from R3, the ping is successful while from R1 it is only 60%
successful even after saving config and rebooting the router R1. This
brings me to a confusing scenario: Static Routes are defined by defining
next Hop or Exit Interface or both in some scenarios, now adding the above
routes deviates away from being a "Next Hop" yet they work, help me clarify
this behaviour and the failure to achieve 100% successful Ping from R1.
Thanks in advance.

[Harold Ritter]

Hi @packet4737 ,

> help me clarify this behaviour and the failure to achieve 100% successful Ping from R1

Not sure what the issue might be. I loaded the Packet Tracer file you provided and applied the static routes I suggested and I get the following results.

R1#ping 2001:DB8:0:3::1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 2001:DB8:0:3::1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/1 ms

R1#ping 2001:DB8:0:3::100

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 2001:DB8:0:3::100, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 0/3/15 ms

R3#ping 2001:DB8:0:1::1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 2001:DB8:0:1::1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/0 ms

R3#ping 2001:DB8:0:1::100

Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 2001:DB8:0:1::100, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 0/3/16 ms

Regards,