Re: Ping across auto IPV6 Tunnel - 50%

Cool, thanks Nick

On Tue, Sep 29, 2009 at 11:00 AM, Nick Matthews <matthn_at_gmail.com> wrote:

> For what it's worth, there's also an IPv6 bug like this:
>
> CSCsh63881 - "alternate ping success with NAT-PT and CEF enabled"
>
> While no IPv6 PT in this example, it's still out there. (Workaround
> is disable CEF, and it isn't fixed in any code yet).
>
>
> -nick
>
> On Tue, Sep 29, 2009 at 1:48 AM, Roy Waterman <roy.waterman_at_gmail.com>
> wrote:
> > Hi Andrew
> >
> > By equal cost load balancing I was referring to the situation you had
> with
> > your config with the router trying load balance but one of the static
> routes
> > is dodgy :)
> > Just as a rule, as Scott Morris likes to say, think like the router.
> > Things become a lot clearer that way, at least, until the router behaves
> in
> > unexpected ways!
> >
> > Glad you resolved the issue.
> >
> > 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
> >>
> >>
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> >>
> >>
> >>
> >>
> >
> >
> > --
> > Regards
> > Roy
> >
> >
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> >
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>

-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net