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

Marcin Kuczera marcin at leon.pl
Sun Mar 29 08:57:07 EDT 2009


David Freedman wrote:
> Can you paste output of your "show nd int" and "show nd neighbor" ?

[bgp1]RedBack_SE100#show nd interface
Intf Grid  Mac Address       Status Circuit             IPv6 Address
0x10000003 00:30:88:12:05:9f Up     2/1:1023:63/1/2/12 
2a01:1d8:7fff:fffd:1::15/126
0x10000004 00:00:10:0b:31:21 Up     2/1:1023:63/1/2/13 
2001:7f8:42::a501:3000:1/64
0x10000014 00:30:88:12:05:a0 Up     2/2:1023:63/1/2/40  2a02:c40:1::1/48
[bgp1]RedBack_SE100#show nd ne
[bgp1]RedBack_SE100#show nd neighbor
IPv6 Address                    Age    Link-layer Addr   State  Circuit
2001:7f8:42::a500:8545:1        17     00:0c:29:d0:86:68 reach  2/1 
vlan-id 102
2001:7f8:42::a501:3000:1        0      00:00:10:0b:31:21 intf   2/1 
vlan-id 102
2a01:1d8:7fff:fffd:1::15        0      00:30:88:12:05:9f intf   2/1 
vlan-id 101
2a01:1d8:7fff:fffd:1::16        5      00:21:59:0c:2e:72 reach  2/1 
vlan-id 101
2a02:c40:1::1                   0      00:30:88:12:05:a0 intf   2/2 
vlan-id 201
2a02:c40:1::2                   39     00:02:b3:26:44:95 reach  2/2 
vlan-id 201
fe80::20e:38ff:fe67:f908        0      00:0e:38:67:f9:08 incmp  2/1 
vlan-id 102
fe80::230:88ff:fe12:59e         0      00:30:88:12:05:9f intf   2/1 
vlan-id 101
fe80::230:88ff:fe12:5a0         0      00:30:88:12:05:a0 intf   2/2 
vlan-id 201
[bgp1]RedBack_SE100#

(link-local for vlan101 is modified by me)

MArcin




> 
> ------------------------------------------------
> 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
>  >  >
>  >  >
>  >  >
>  >  > _______________________________________________
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>  >  > redback-nsp at puck.nether.net
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>  >  >
>  >
>  >
> 
> 



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