[c-nsp] 6rd on ASR1k
Harold Ritter
hritter at cisco.com
Tue Nov 1 09:31:39 EDT 2011
Ruslan,
OK, I think we have found the issue. You use a 16 bit prefix length
("tunnel 6rd ipv4 prefix-len 16") which means that only the last 16 bits
of the ipv4 address will be inserted in the 6RD ipv6 address. The gateway
assumes the prefix is the same as the local (192.88/16) and tries to send
the reply back to 192.88.5.250. You just need to either use the same
prefix (/16) on both the client and BR or remove the following command;
"tunnel 6rd ipv4 prefix-len 16". If you do that make sure you insert the
full 32 bits ipv4 address on the workstation (manual procedure be cause of
your 6to4 hack).
Regards
Le 11-11-01 09:22, « Ruslan Pustovoytov » <rus-p at inbox.ru> a écrit :
>I use 178.140.5.250 IPv4 address on workstation.
>It is not changed.
>What is the reason to change it?
>
>> Ruslan,
>>
>> I meant the IPv4 address you use on the workstation. Could you please
>>let
>> us know what it is.
>>
>> Regards
>>
>>
>> Le 11-11-01 02:53, « Ruslan Pustovoytov » <rus-p at inbox.ru> a écrit :
>>
>>
>>> Did you mean IPv4 6RD relay address ?
>>> Yes, I changed it from 192.88.99.127 to 192.88.98.127
>>>
>>>
>>>> Did you also change the IPv4 prefix you use on the workstation?
>>>>
>>>>
>>>>
>>>> Le 11-10-31 09:19, « Ruslan Pustovoytov » <rus-p at inbox.ru> a écrit :
>>>>
>>>>
>>>>
>>>>> I change 6rd relay IPv4 address 192.88.99.127 to 192.88.98.127 in BR
>>>>> config (loopback10) and windiws 6to4 relay.
>>>>> The picture is the same, ICMPv6 packet successfully going through the
>>>>> network and egressing from the last iface directly connected to ASR.
>>>>> But
>>>>> I don't see this packets in debug output.
>>>>>
>>>>>
>>>>>
>>>>> Harold Ritter (hritter) пишет:
>>>>>
>>>>>
>>>>>> Could you try using a prefix other than 192.88.99.0/24 and see if it
>>>>>> makes a diffrence.
>>>>>>
>>>>>> Envoyé de mon iPhone
>>>>>>
>>>>>> Le 2011-10-31 à 02:15, "Ruslan Pustovoytov" <rus-p at inbox.ru> a
>>>>>>écrit :
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>> 1. Ok.
>>>>>>> 2. Exactly.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Harold Ritter пишет:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> Hi Ruslan,
>>>>>>>>
>>>>>>>> Two things:
>>>>>>>>
>>>>>>>>
>>>>>>>> 1. It would be safer not to use the 192.88.99/24 prefix for this
>>>>>>>> purpose, as this prefix has been reserved for the 6to4 relay
>>>>>>>> anycast address (RFC3068).
>>>>>>>> 2. According to the information below, the BR will try to
>>>>>>>>forward
>>>>>>>> the return traffic to 192.88.5.250 (prefix 192.88 + suffix =
>>>>>>>> 0x5fa = 5.250). Is this the address assigned to the Windows7
>>>>>>>> Ethernet interface?
>>>>>>>>
>>>>>>>>
>>>>>>>> Regards
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> *Ruslan Pustovoytov <rus-p at inbox.ru <mailto:rus-p at inbox.ru>>*
>>>>>>>> Envoyé par : cisco-nsp-bounces at puck.nether.net
>>>>>>>> <mailto:cisco-nsp-bounces at puck.nether.net>
>>>>>>>>
>>>>>>>> 27/10/2011 09:42 AM
>>>>>>>>
>>>>>>>>
>>>>>>>> A
>>>>>>>> Harold Ritter <hritter at cisco.com <mailto:hritter at cisco.com>>
>>>>>>>> cc
>>>>>>>> cisco-nsp at puck.nether.net <mailto:cisco-nsp at puck.nether.net>
>>>>>>>> Objet
>>>>>>>> Re: [c-nsp] 6rd on ASR1k
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Excuse me for a long delay.
>>>>>>>>
>>>>>>>> I check all of my configuration on client and BR.
>>>>>>>> In my lab I have no native 6RD client so I use Windows machine
>>>>>>>>with
>>>>>>>> some
>>>>>>>> hack.
>>>>>>>>
>>>>>>>> My client is Windows7 and I use it's 6to4 adapter to emulate 6RD
>>>>>>>> functionality.
>>>>>>>> When I assign "real" IPv4 address to Local Area network adapter,
>>>>>>>> 6to4
>>>>>>>> adapter became functional.
>>>>>>>> Then delete automatic 6to4 IPv6 address (2002:....) and add new
>>>>>>>>IPv6
>>>>>>>> address accordingly to 6RD rules.
>>>>>>>> Also change default 6to4 relay to my 6RD relay IPv4 address
>>>>>>>> (192.88.99.127)
>>>>>>>>
>>>>>>>> Tunnel 6TO4 Adapter:
>>>>>>>>
>>>>>>>> IPv6-address. . . . . . . . . . . . : 2XXX:YYYY:206:5fa::abca
>>>>>>>> Default gateway. . . . . . . . . : 2002:c058:637f::1
>>>>>>>>
>>>>>>>> My prefix-length for 6RD config in BR is 16 bit.
>>>>>>>> So, only left two octets of IPv4 address coded into 6RD IPv6
>>>>>>>> address.
>>>>>>>>
>>>>>>>> I add default route for IPv6 family via command:
>>>>>>>> netsh interface ipv6>add route ::/0 6to4 2002:0c58:637f::1
>>>>>>>> Route table looks like this:
>>>>>>>>
>>>>>>>> IPv6 таблица маршрута
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>===================================================================
>>>>>>>>==
>>>>>>>> ==
>>>>>>>> ====
>>>>>>>> Ðктивные маршруты:
>>>>>>>> Метрика Сетевой Ð°Ð´Ñ€ÐµÑ Ð¨Ð»ÑŽÐ·
>>>>>>>> 13 281 ::/0 2002:c058:637f::1
>>>>>>>> 1 306 ::1/128 On-link
>>>>>>>> 12 58 2001::/32 On-link
>>>>>>>> 12 306 2001:0:5ef5:79fd:8f5:2c30:4d73:fa05/128
>>>>>>>> On-link
>>>>>>>> 13 1025 2002::/16 On-link
>>>>>>>> 13 281 2a02:2168:206:5fa::/64 On-link
>>>>>>>> 13 281 2a02:2168:206:5fa::abca/128
>>>>>>>> On-link
>>>>>>>> 12 306 fe80::/64 On-link
>>>>>>>> 12 306 fe80::8f5:2c30:4d73:fa05/128
>>>>>>>> On-link
>>>>>>>> 1 306 ff00::/8 On-link
>>>>>>>> 12 306 ff00::/8 On-link
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>===================================================================
>>>>>>>>==
>>>>>>>> ==
>>>>>>>> ====
>>>>>>>> ПоÑтоÑнные маршруты:
>>>>>>>> Метрика Сетевой Ð°Ð´Ñ€ÐµÑ Ð¨Ð»ÑŽÐ·
>>>>>>>> 0 4294967295 ::/0 2002:c058:637f::1
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>===================================================================
>>>>>>>>==
>>>>>>>> ==
>>>>>>>> ====
>>>>>>>>
>>>>>>>> Then I ping 2XXX:YYYY:200:800::2 address.
>>>>>>>> When I did command "deb ipv6 icmp" on ASR I see some ICMP but its
>>>>>>>> did
>>>>>>>> not relevant for me.
>>>>>>>> Wireshark on Windows 6RD client show me that all ICMP packet
>>>>>>>>envelop
>>>>>>>> with right IPv4 header and successfully leaving the host.
>>>>>>>> Also last interface in my network directly attached to ASR show
>>>>>>>> increments on egress direction in packet filter with protocol 41
>>>>>>>>in
>>>>>>>> payload as mask value when I pinging.
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Harold Ritter пишет:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>> Ruslan,
>>>>>>>>>
>>>>>>>>> Just to make sure, do you have a default route on the 6rd client
>>>>>>>>> pointing
>>>>>>>>> at the 6rd BR? Since you are pinging the ASR1k itself, could you
>>>>>>>>> please
>>>>>>>>> run a "deb ipv6 icmp" on the ASR to see if the ICMP packets are
>>>>>>>>> received.
>>>>>>>>>
>>>>>>>>> Regards
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Le 11-10-14 01:57, « Ruslan Pustovoitov » <rus-p at mostelekom.net
>>>>>>>>> <mailto:rus-p at mostelekom.net>> a écrit :
>>>>>>>>>
>>>>>>>>> >> Hi Harold !
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> This is my config relevant to 6rd.
>>>>>>>>>> Also, I don't know how to debug packets with protocol 41 in IP
>>>>>>>>>> payload
>>>>>>>>>> in ASR.
>>>>>>>>>> Debug in form "debug ip packet #access-list" do not working for
>>>>>>>>>> non
>>>>>>>>>> software routers.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> interface Loopback10
>>>>>>>>>> description 6RD_Relay
>>>>>>>>>> ip address 192.88.99.127 255.255.255.255
>>>>>>>>>> !
>>>>>>>>>> interface Tunnel0
>>>>>>>>>> no ip address
>>>>>>>>>> no ip redirects
>>>>>>>>>> ipv6 address 2XXX:YYYY:206::/128 anycast
>>>>>>>>>> tunnel source Loopback10
>>>>>>>>>> tunnel mode ipv6ip 6rd
>>>>>>>>>> tunnel 6rd ipv4 prefix-len 16
>>>>>>>>>> tunnel 6rd prefix 2XXX:YYYY:206::/48
>>>>>>>>>> !
>>>>>>>>>> ! Incoming interface for IPv6 encapsulated in IPv4 packets
>>>>>>>>>> interface GigabitEthernet0/0/1.531
>>>>>>>>>> encapsulation dot1Q 531
>>>>>>>>>> ip address ZZZ.ZZZ.255.210 255.255.255.252
>>>>>>>>>> no ip redirects
>>>>>>>>>> no ip unreachables
>>>>>>>>>> no ip proxy-arp
>>>>>>>>>> !
>>>>>>>>>> interface GigabitEthernet0/0/0.550
>>>>>>>>>> encapsulation dot1Q 550
>>>>>>>>>> ipv6 address 2XXX:YYYY:200:800::2/126
>>>>>>>>>> ipv6 nd ra suppress
>>>>>>>>>> !
>>>>>>>>>> ipv6 route 2XXX:YYYY:206::/48 Tunnel0
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> I try to ping 2XXX:YYYY:200:800::2
>>>>>>>>>> This is the local IPv6 address for ASR.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Harold Ritter пишет:
>>>>>>>>>> >>> Ruslan,
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>> Can you provide the BR config and the address you are trying to
>>>>>>>>>>> ping.
>>>>>>>>>>>
>>>>>>>>>>> Regards
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> Le 11-10-07 04:40, « Ruslan Pustovoitov »
>>>>>>>>>>><rus-p at mostelekom.net
>>>>>>>>>>> <mailto:rus-p at mostelekom.net>> a
>>>>>>>>>>> écrit :
>>>>>>>>>>>
>>>>>>>>>>> >>> >>>> Hi all
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>> I try to setup 6rd on asr1k accordingly to
>>>>>>>>>>>> http://docwiki.cisco.com/wiki/6rd_Configuration_Example
>>>>>>>>>>>> Then I ping6 IPv6 host from client and see that IPv6 packet
>>>>>>>>>>>> envelops in
>>>>>>>>>>>> IPv4 with right IPv4 destination (6rd relay IPv4 address).
>>>>>>>>>>>> This IPv4 packet seccessfully reach asr1k and nothing else.
>>>>>>>>>>>> Packets
>>>>>>>>>>>> silently disappear.
>>>>>>>>>>>>
>>>>>>>>>>>> The output of "show tunnel 6rd tunnel 0Interface Tunnel0"
>>>>>>>>>>>>dont
>>>>>>>>>>>> show
>>>>>>>>>>>> any
>>>>>>>>>>>> counters info:
>>>>>>>>>>>> Tunnel Source: 192.88.99.127
>>>>>>>>>>>> 6RD: Operational, V6 Prefix: 2YYY:ZZZZ:206::/48
>>>>>>>>>>>> V4 Prefix, Length: 16, Value: 192.88.0.0
>>>>>>>>>>>> V4 Suffix, Length: 0, Value: 0.0.0.0
>>>>>>>>>>>> General Prefix: 2YYY:ZZZZ:206:637F::/64
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> Also, I don't see any IPv6 packet going from asr1k to IPv6
>>>>>>>>>>>> directly
>>>>>>>>>>>> connected host where I run tcpdump.
>>>>>>>>>>>> Client seccessfully pinging 6rd relay 192.88.99.127
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> _______________________________________________
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>>>>>>>>>>>> >>>> >>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>> >>> >
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> cisco-nsp mailing list cisco-nsp at puck.nether.net
>>>>>>>>> <mailto:cisco-nsp at puck.nether.net>
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>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>> _______________________________________________
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>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>
>>>>
>>>>
>>>>
>>
>>
>>
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>>
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