Re: Ping across auto IPV6 Tunnel - 50%

Hi Andrew,

On R3, the static route

ipv6 route 2001:1:1:1::/64 Tunnel0 should be removed.

It cannot derive the destination ipv4 address in the above case.
Looking forward to your comments.

Lejoe

On Tue, Sep 29, 2009 at 2:36 PM, ALL From_NJ <all.from.nj_at_gmail.com> wrote:
> Ok, problem found, I only noticed it when I was going to copy my configs
> into this mail and send them to you all. Here are my configs, I will not
> say yet what the problem is, but it is found in my configs (usually the case
> ...).
>
> Andrew
>
> PS - any other comments are most welcome!!!
>
> ~~~~~~~~
>
> R1:
>
> ipv6 unicast-routing
> !
> interface Tunnel0
> no ip address
> no ip redirects
> ipv6 address 2002:101:101::1/64
> tunnel source Loopback0
> tunnel mode ipv6ip 6to4
> !
> interface Loopback0
> ip address 1.1.1.1 255.255.255.255
> ipv6 address 2001:1:1:1::1/64
> ipv6 rip 1 enable
> !
> ipv6 route 2002::/16 Tunnel0
> ipv6 route 2001:3:3:3::3/128 2002:303:303::3
> !
>
>
> R3 is across the frame cloud. Here are the configs from R3:
>
> ipv6 unicast-routing
> !
> interface Loopback0
> ip address 3.3.3.3 255.255.255.0
> ipv6 address 2001:3:3:3::3/64
> ipv6 rip 1 enable
> !
> interface Tunnel0
> no ip address
> no ip redirects
> ipv6 address 2002:303:303::3/64
> tunnel source Loopback0
> tunnel mode ipv6ip 6to4
> !
> ipv6 route 2001:1:1:1::/64 2002:101:101::1
> ipv6 route 2001:1:1:1::/64 Tunnel0
> ipv6 route 2002::/16 Tunnel0
>
>
>
>
>
>
> On Tue, Sep 29, 2009 at 12:27 AM, ALL From_NJ <all.from.nj_at_gmail.com> wrote:
>
>> For sure ... that was one of my first thought. Since the ipv6 addresses
>> are really v4 addresses, I consulted the ipv4 routing table in both
>> directions. There is only a single path to each loopback and physical
>> address
>>
>> Roy, I appreciate your response. Any thoughts on additional debugs or show
>> commands?
>>
>>
>>
>> On Tue, Sep 29, 2009 at 12:18 AM, Roy Waterman <roy.waterman_at_gmail.com>wrote:
>>
>>> Hi Andrew
>>>
>>> So you've verified that there is no equal cost load balancing going on?
>>>
>>> Regards
>>> Roy
>>>
>>> 2009/9/29 ALL From_NJ <all.from.nj_at_gmail.com>
>>>
>>>> Hey team,
>>>>
>>>> Got this working tonight, auto ipv6 tunnels.
>>>>
>>>> Divin provided me this link:
>>>>
>>>> http://ardenpackeer.com/routing-protocols/tutorial-ipv6-tunnels-part-2-automatic-6to4-tunnels/
>>>> <-- this helped me much.
>>>>
>>>> Conceptually it helped me to consider this a 'hack' or 'cheat'. Kind of
>>>> neat in some ways too I guess ... by defining the IPv4 address as part of
>>>> the IPv6 address, you are really telling the router to find the remote
>>>> peer
>>>> by it's IPv4 address. Of course ... the IPv4 routing table needs to be
>>>> right before this will work ...
>>>>
>>>> Any who ... my question is related to ping. Has anyone else seen 50%
>>>> ping
>>>> timeout when using auto tunnels? I get all responses to other frame
>>>> relay
>>>> ipv6 peers or Ethernet peers etc ... . Here is the output, kind of looks
>>>> like a pacing issue, but the fact that other pings work 100% of the time
>>>> does not make sense.
>>>>
>>>> R1(config)#do ping 2001:3:3:3::3 sou 2001:1:1:1::1 re 10
>>>>
>>>> Sending 10, 100-byte ICMP Echos to 2001:3:3:3::3, timeout is 2 seconds:
>>>> Packet sent with a source address of 2001:1:1:1::1
>>>> !.!.!.!.!.
>>>> Success rate is 50 percent (5/10), round-trip min/avg/max = 32/32/36 ms
>>>>
>>>> I have static routes going to the remote tunnel peer.
>>>>
>>>> Trace works just fine, no timeouts, single hop. I tried it with and
>>>> without
>>>> ipv6 cef. I also did a debug ipv6 pack det and debug ipv6 icmp ...
>>>> nothing
>>>> out of the ordinary ...
>>>>
>>>> Any thoughts? Seen this?
>>>>
>>>> --
>>>> Andrew Lee Lissitz
>>>> all.from.nj_at_gmail.com
>>>>
>>>>
>>>> Blogs and organic groups at http://www.ccie.net
>>>>
>>>> _______________________________________________________________________
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> Regards
>>> Roy
>>>
>>
>>
>>
>> --
>> Andrew Lee Lissitz
>> all.from.nj_at_gmail.com
>>
>
>
>
> --
> Andrew Lee Lissitz
> all.from.nj_at_gmail.com
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

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Received on Tue Sep 29 2009 - 15:23:02 ART