Can ping from R3 to R1, but not R1 to R3???

pujan96

R3-ser0/0: 2001:C15C:1234:2222:20D:29FF:FE43:58A0


R2-ser0/1: 2001:C15C:1234:2222:211:BBFF:FE1D:DE00
R2-ser0/0: 2001:DB8:1234:1111:211:BBFF:FE1D:DE00


R1-ser0/0: 2001:DB8:1234:1111:212:DAFF:FEC9:F00
R1-fa0/0: 2001:DB8:1234:0:212:DAFF:FEC9:F01


Hi Guys,

Im learning about IPV6 and during my labbing I came across something weird.

From R1 I can ping R2 and R3 (all interfaces);
However when I ping from R3 I cannot ping R1s serial 0/0 interface, I get results of HHHHH after the ping completes.
As I thought somethings not right I then set up int fa0/0 for R1, which I CAN PING from R3.
So to be clear from R1 I can ping all the other interfaces on R2 and R3, but from R3 I cant ping R1s serial 0/0 interface, but can ping R1s fa0/0 interface.

Anybody have any ideas as to why that is?

Thanks
Pujan

Uriah7

The ICMPv6 response type H means that the host was unreachable. The icmp packet made it to the destination router (r1) but was unable to find the host on its network (the serial interface).
Double check your routing table on R1 (you may be send the icmp request to a router other than R1 and not know it), check the IPV6 destination address just to make sure it is correct and post your configurations for R1 and R3.

Also, are R3 and R1 directly connected?