From: EDL (r.s.cciestudy@gmail.com)
Date: Wed Jan 23 2008 - 22:34:23 ARST
Is it because both interfaces sharing the same link-local address?
On 1/22/08, YourPal <dearprudence28@gmail.com> wrote:
> Hi Group,
>
> I have a weird ping issue in IPv6 which I just don't understand. Please see
> below:
>
> R3#sh ipv int br
> FastEthernet0/0 [up/up]
> FE80::212:1FF:FEF6:C00
> FEC0:CC1E:1:38:212:1FF:FEF6:C00
> Serial0/0 [up/up]
> FE80::212:1FF:FEF6:C00
> FEC0:CC1E:1:35::3
>
>
> R3 learns the following two RIP routes:
>
> R3#sh ipv ro FEC0:CC1E:1:4:217:FFF:FE50:1D61
> R FEC0:CC1E:1:4::/64 [120/3]
> via FE80::21B:54FF:FEBC:5ECC, Serial0/0
>
> R3#sh ipv ro 2001:192:10:1:217:FFF:FE50:1D60
> R 2001:192:10:1::/64 [120/3]
> via FE80::21B:54FF:FEBC:5ECC, Serial0/0
>
>
> R3#pi FEC0:CC1E:1:4:217:FFF:FE50:1D61 so f0/0
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to FEC0:CC1E:1:4:217:FFF:FE50:1D61, timeout
> is 2 seconds:
> Packet sent with a source address of FEC0:CC1E:1:38:212:1FF:FEF6:C00
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 36/44/52 ms
>
>
> R3#pi 2001:192:10:1:217:FFF:FE50:1D60 so f0/0
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 2001:192:10:1:217:FFF:FE50:1D60, timeout
> is 2 seconds:
> Packet sent with a source address of FEC0:CC1E:1:35::3
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 32/39/48 ms
>
>
> R3 pings to the first destination IPv6 address (i.e.
> FEC0:CC1E:1:4:217:FFF:FE50:1D61) sourcing from its fa0/0 interface seems
> correct.
>
> However when R3 pings the second destination IPv6 address (i.e.
> 2001:192:10:1:217:FFF:FE50:1D60) sourcing from its fa0/0 interface, it
> appears that it uses its interface serial0/0 IPv6 address (i.e.
> FEC0:CC1E:1:35::3) instead of FEC0:CC1E:1:38:212:1FF:FEF6:C00.
>
> I have tried the extended ping ipv6 but result is the same. Can anyone
> explain why?
>
>
>
> Thank you.
>
> BR,
> Emil
>
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