[rbak-nsp] ipv6 - strange ?? (ping)

David Freedman david.freedman at uk.clara.net
Sun Mar 29 08:51:08 EDT 2009


Can you paste output of your "show nd int" and "show nd neighbor" ?

------------------------------------------------
David Freedman
Group Network Engineering 
Claranet Limited
http://www.clara.net



-----Original Message-----
From: Marcin Kuczera [mailto:marcin at leon.pl]
Sent: Sun 3/29/2009 13:39
To: David Freedman
Cc: redback-nsp at puck.nether.net
Subject: Re: [rbak-nsp] ipv6 - strange ?? (ping)
 
David Freedman wrote:
> 
> Your output is a bit hard to parse , but I can see you have two link 
> local addresses the same :
> 
>  > Intf name:      vlan101
>  >        Link local addr:fe80::230:88ff:fe12:59f  Number of Bound Circuits
>  >
>  > Intf name:      vlan102
>  >        Link local addr:fe80::230:88ff:fe12:59f  Number of Bound Circuits

you are right, that's strage.. but - assigned automatically

> Can you ping vlan201 (which has a different link-local)?

nope..
[bgp1]RedBack_SE100#ping 2a02:c40:1::1
PING6 2a02:c40:1::1 : 8 data bytes
timeout is 1 second, source 2a02:c40:1::1
.....
--- 2a02:c40:1::1 ping6 statistics ---
5 packets transmitted, 0 packets received, 100% packet loss
[bgp1]RedBack_SE100#

> According to RFC, these should be "scoped" if they are going to be 
> shared, but I don't
> see any evidence of scoping going on here.
> 
> As a test, can you try changing link-local address of one of the vlans 
> to something else?

I did, but it didn't help...

Marcin



> Dave.
> 
> 
> ------------------------------------------------
> David Freedman
> Group Network Engineering
> Claranet Limited
> http://www.clara.net
> 
> 
> 
> -----Original Message-----
> From: Marcin Kuczera [mailto:marcin at leon.pl]
> Sent: Sun 3/29/2009 12:58
> To: David Freedman
> Cc: redback-nsp at puck.nether.net
> Subject: Re: [rbak-nsp] ipv6 - strange ?? (ping)
> 
> David Freedman wrote:
>  >
>  > What is the source IPv6 interface for your pings?
> 
> Look - the ping goes to the other end of p2p interface (vlan102 is p2mp,
> because it is IX).
> So - i.e. for vlan101 if I ping 2a01:1d8:7fff:fffd:1::16, the source is
> 2a01:1d8:7fff:fffd:1::15 (from outgoing interface, just like in ipv4).
> 
>  > Is it reachable by all the destinations you are pinging?
> 
> yes, I'am pinging point-to-point ends..
> The biggest problem is with... pinging myself !
> 
>  > Also, do you have an admin acl in place on the context?
> 
> no ACLs.
> 
> At the first interface setup (vlan101) both ends were responding, after
> adding vlan102 ipv6 everything started behaving strange..
> 
> Regards,
> Marcin
> 
> 
> 
>  >
>  > ------------------------------------------------
>  > David Freedman
>  > Group Network Engineering
>  > Claranet Limited
>  > http://www.clara.net
>  >
>  >
>  >
>  > -----Original Message-----
>  > From: redback-nsp-bounces at puck.nether.net on behalf of Marcin Kuczera
>  > Sent: Sun 3/29/2009 11:41
>  > To: redback-nsp at puck.nether.net
>  > Subject: [rbak-nsp] ipv6 - strange ?? (ping)
>  >
>  >
>  >
>  > Look at that, I have IPv6 /32 prefix, advertised via BGP.
>  > Both peers are UP.
>  > Neighbor              AS  MsgRcvd  MsgSent    TblVer  InQ OutQ Rst
>  > Up/Down  PfxRcvd/Sent
>  > 2001:7f8:42::a500:8545:1     8545     3095     3491     22392    0    0
>  >   14    2d01h     38      1
>  > 2a01:1d8:7fff:fffd:1::16    15744    11432     7919     22392    0    0
>  >    4    2d08h   1579      1
>  >
>  > My interfaces:
>  >
>  > Intf name:      vlan101
>  > Intf state:     Up                        IPv6 MTU:       1500
>  >        Description:    Silweb
>  > Address:        2a01:1d8:7fff:fffd:1::15  Prefix len:     126
>  >        Link local addr:fe80::230:88ff:fe12:59f  Number of Bound Circuits
>  > (incl. dynamic) = 1
>  >
>  > Intf name:      vlan102
>  > Intf state:     Up                        IPv6 MTU:       1500
>  >        Description:    PLIX
>  > Address:        2001:7f8:42::a501:3000:1  Prefix len:     64
>  >        Link local addr:fe80::230:88ff:fe12:59f  Number of Bound Circuits
>  > (incl. dynamic) = 1
>  >
>  > Intf name:      vlan201
>  > Intf state:     Up                        IPv6 MTU:       1500
>  >        Description:    serwerownia komercyjna
>  > Address:        2a02:c40:1::1             Prefix len:     48
>  >        Link local addr:fe80::230:88ff:fe12:5a0  Number of Bound Circuits
>  > (incl. dynamic) = 1
>  >
>  > ##################
>  > now - the problem (vlan101):
>  > [bgp1]RedBack_SE100#ping 2a01:1d8:7fff:fffd:1::15
>  > PING6 2a01:1d8:7fff:fffd:1::15 : 8 data bytes
>  > timeout is 1 second, source 2a01:1d8:7fff:fffd:1::15
>  > .....
>  > --- 2a01:1d8:7fff:fffd:1::15 ping6 statistics ---
>  > 5 packets transmitted, 0 packets received, 100% packet loss
>  > [bgp1]RedBack_SE100#ping 2a01:1d8:7fff:fffd:1::16
>  > PING6 2a01:1d8:7fff:fffd:1::16 : 8 data bytes
>  > timeout is 1 second, source 2a01:1d8:7fff:fffd:1::15
>  > .....
>  > --- 2a01:1d8:7fff:fffd:1::16 ping6 statistics ---
>  > 5 packets transmitted, 0 packets received, 100% packet loss
>  >
>  > 1  2a01:1d8:7fff:fffd:1::15  3.955 ms  3.489 ms  3.761 ms
>  > [bgp1]RedBack_SE100#trace 2a01:1d8:7fff:fffd:1::16
>  > traceroute6 to 2a01:1d8:7fff:fffd:1::16 from 2a01:1d8:7fff:fffd:1::15,
>  > 30 hops max, 12 byte packets
>  > 1  * * *
>  > ^C[bgp1]RedBack_SE100#trace 2a01:1d8:7fff:fffd:1::15
>  > traceroute6 to 2a01:1d8:7fff:fffd:1::15 from 2a01:1d8:7fff:fffd:1::15,
>  > 30 hops max, 12 byte packets
>  > 1  2a01:1d8:7fff:fffd:1::15  4.172 ms  1.481 ms  1.656 ms
>  >
>  > (vlan102):
>  > [bgp1]RedBack_SE100#ping 2001:7f8:42::a500:8545:1
>  > PING6 2001:7f8:42::a500:8545:1 : 8 data bytes
>  > timeout is 1 second, source 2001:7f8:42::a501:3000:1
>  > !!!!!
>  >
>  > --- 2001:7f8:42::a500:8545:1 ping6 statistics ---
>  > 5 packets transmitted, 5 packets received, 0% packet loss
>  > round-trip min/avg/max/std-dev = 6.649/7.014/7.445/0.317 ms
>  > [bgp1]RedBack_SE100#ping 2001:7f8:42::a501:3000:1
>  > PING6 2001:7f8:42::a501:3000:1 : 8 data bytes
>  > timeout is 1 second, source 2001:7f8:42::a501:3000:1
>  > .....
>  > --- 2001:7f8:42::a501:3000:1 ping6 statistics ---
>  > 5 packets transmitted, 0 packets received, 100% packet loss
>  > [bgp1]RedBack_SE100#trace 2001:7f8:42::a501:3000:1
>  > traceroute6 to 2001:7f8:42::a501:3000:1 from 2001:7f8:42::a501:3000:1,
>  > 30 hops max, 12 byte packets
>  > 1  2001:7f8:42::a501:3000:1  3.839 ms  2.355 ms  2.785 ms
>  >
>  >
>  > What is going wrong ???
>  > Is it so unstable or what ???
>  > SEOS 6.1.4.1.p4
>  >
>  >
>  > Regards,
>  > Marcin
>  >
>  >
>  >
>  > _______________________________________________
>  > redback-nsp mailing list
>  > redback-nsp at puck.nether.net
>  > https://puck.nether.net/mailman/listinfo/redback-nsp
>  >
> 
> 


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