Re: Difference between tunnel modes: GRE/IP versus IPv6/IP

Sweet, thats what I was looking for. Thanks Garry.

garry baker wrote:
> Tunneling Type: Manual (ipv6ip )
>
> Suggested Usage: Simple point-to-point tunnels that can be used within a
> site or between sites.
>
> Usage Notes: Can carry IPv6 packets only.
>
>
> Tunneling Type: GRE/IPv4 (gre ip)
>
> Suggested Usage: Simple point-to-point tunnels that can be used within a
> site or between sites.
>
> Usage Notes: Can carry IPv6, CLNS, and many other types of packets.
>
> http://www.cisco.com/en/US/customer/docs/ios/interface/configuration/guide/ir_impl_tun_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1072447
>
>
> --
> Garry L. Baker
>
> "There is no 'patch' for stupidity." - www.sqlsecurity.com
>
>
> On Tue, Feb 23, 2010 at 4:00 PM, Andy Reid <ccie_at_reid.it> wrote:
>
>
>> Thanks for your time checking this. From a traffic perspective I wonder if
>> there is any restrictions on an IPv6/IP tunnel over a straight GRE tunnel.
>>
>>
>> regards Andy
>>
>> garry baker wrote:
>>
>>
>>> ' difference in functionality ' that i can see from a quick debug ip
>>> packet
>>> is
>>>
>>> GRE/IP = len 124, sending, proto=47
>>> IPv6/IP = len 120, sending, proto=41
>>>
>>> changing the way the tunnel is encapusaled, in size at least....
>>>
>>> Tunnel1 is up, line protocol is up
>>> Hardware is Tunnel
>>> MTU 1514 bytes, BW 9 Kbit/sec, DLY 500000 usec,
>>> reliability 255/255, txload 1/255, rxload 1/255
>>> Encapsulation TUNNEL, loopback not set
>>> Keepalive not set
>>> Tunnel source 1.1.1.12, destination 1.1.1.11
>>> Tunnel protocol/transport GRE/IP
>>>
>>> R11#ping 3001::12 r 1
>>> Type escape sequence to abort.
>>> Sending 1, 100-byte ICMP Echos to 3001::12, timeout is 2 seconds:
>>> !
>>> Success rate is 100 percent (1/1), round-trip min/avg/max = 80/80/80 ms
>>>
>>> R12#
>>> IP: s=1.1.1.12 (Tunnel1), d=1.1.1.11 (FastEthernet0/0), len 124, sending,
>>> proto=47
>>>
>>>
>>>
>>> R12#sh int tunnel 1
>>> Tunnel1 is up, line protocol is up
>>> Hardware is Tunnel
>>> MTU 1514 bytes, BW 9 Kbit/sec, DLY 500000 usec,
>>> reliability 255/255, txload 1/255, rxload 1/255
>>> Encapsulation TUNNEL, loopback not set
>>> Keepalive not set
>>> Tunnel source 1.1.1.12, destination 1.1.1.11
>>> Tunnel protocol/transport IPv6/IP
>>>
>>> R11#ping 3001::12 r 1
>>> Type escape sequence to abort.
>>> Sending 1, 100-byte ICMP Echos to 3001::12, timeout is 2 seconds:
>>> !
>>> Success rate is 100 percent (1/1), round-trip min/avg/max = 68/68/68 ms
>>>
>>> R12#
>>> IP: tableid=0, s=1.1.1.11 (FastEthernet0/0), d=1.1.1.12 (FastEthernet0/0),
>>> routed via RIB
>>> IP: s=1.1.1.11 (FastEthernet0/0), d=1.1.1.12 (FastEthernet0/0), len 120,
>>> rcvd 3, proto=41
>>> IP: s=1.1.1.12 (Tunnel1), d=1.1.1.11 (FastEthernet0/0), len 120, sending,
>>> proto=41
>>>
>>>
>>> --
>>> Garry L. Baker
>>>
>>> "There is no 'patch' for stupidity." - www.sqlsecurity.com
>>>
>>>
>>> On Tue, Feb 23, 2010 at 12:47 PM, Andy Reid <ccie_at_reid.it> wrote:
>>>
>>>
>>>
>>>
>>>> Hi All,
>>>>
>>>> Could someone explain to me the difference between GRE/IP and IPv6/IP
>>>> tunnel modes when the GRE/IP tunnel has an IPv6 address configured at
>>>> each
>>>> end.
>>>>
>>>> Both tunnel modes have an IPv4 source and destination address. The only
>>>> difference I can spot is in the "show int tunnel x" command where the
>>>> Tunnel
>>>> protocol/transport is shown differently. I can't spot any difference in
>>>> functionality at the moment.
>>>>
>>>> regards Andy
>>>>
>>>>
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>
>
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Received on Tue Feb 23 2010 - 22:33:03 ART