Go CCIE Go!! - A Cisco Certified Internetwork Expert

Wow great explanation and putting it in format thats easy to remember.
R/
Jonathan
On Sat, May 31, 2008 at 1:31 PM, Narbik Kocharians wrote:
> *There are 5 tunneling solution in IPv6:* > ** > 1. *Using the “Tunnel mode ipv6ip”, in this case the tunnel source and > destination are configured with IPv4 addressing and the tunnel interface is > configured with IPv6. This will use protocol 41. This is used for > IPv6/IPv4. > * > ** > > R1(config)#int tunnel 1 > > R1(config-if)#ipv6 address 12:1:12::1/64 > > R1(config-if)#tunnel source 10.1.12.1 > > R1(config-if)#tunnel destination 10.1.12.2 > > R1(config-if)#*tunnel mode ipv6ip* > > 2. *Using the “Tunnel mode gre ipv6″, in this case the tunnel, tunnel > source > and destination are all configured with IPv6 addressing. This is used for > IPv6/IPv6.* > > > BB1(config)#int tunnel 1 > > BB1(config-if)#ipv6 address 121:1:121::111/64 > > BB1(config-if)#tunnel source 10:1:111::111 > > BB1(config-if)#tunnel destination 10:1:112::112 > > BB1(config-if)#*tunnel mode gre ipv6* > > ** > 3. *In this case, the tunnel mode is NOT used at all, note that the tunnel > interface is configured with IPv6 and the tunnel source and destination is > configured with IPv4 but no mention of tunnel mode. This configuration will > use protocol 47. This is used for IPv6/IPv4.* > > > R1(config)#int tunnel 13 > > R1(config-if)#ipv6 address 13:1:13::1/64 > > R1(config-if)#tunnel source 10.1.13.1 > > R1(config-if)#tunnel destination 10.1.13.3 > > 4. *Note in this case a special addressing is assigned to the tunnel > interface which is a concatenation of a reserved IPv6 address of 2002 > followed by the translated IPv4 address of a given interface on the router. > In this configuration ONLY the tunnel source address is used and since the > tunnel is automatic, the destination address is NOT configured. The tunnel > mode is set to “Tunnel mode ipv6ip 6to4″. Note the IPv4 address of > 10.1.1.1is translated to 0A.01.01.01 and once concatenated, it will be > “2002:0A01:0101: or 2002:A01:101. This is used for IPv6/IPv4.* > > R1(config)#interface Tunnel14 > > R1(config-if)#ipv6 address 2002:A01:101::/128 > > R1(config-if)#tunnel source 10.1.1.1 > > R1(config-if)#*tunnel mode ipv6ip 6to4* > > 5. *ISATAP, ISATAP works like 6to4 tunnels, with one major difference, > it uses a special IPv6 address which is formed as follows:* > > *In this tunnel mode, the network portion can be any IPv6 address, whereas > in 6to4 it had to start with 2002.* > > *Note when the IPv6 address is assigned to the tunnel interface, the > “eui-64″ is used, in this case the host portion of the IPv6 address starts > with “0000.5EFE” and then the rest of the host portion is the translated > IPv4 address of the tunnel’s source IPv4 address. **This translation is > performed automatically unlike 6to4. This is used for IPv6/IPv4. > > * > > R4(config)#int tunnel 46 > > R4(config-if)#ipv6 address 46:1:46::/64 eui-64 > > R4(config-if)#tunnel source 10.44.44.44 > > R4(config-if)#*tunnel mode ipv6ip ISATAP* > > > Sorry for the lengthy post and i hope this helped. > > On Sat, May 31, 2008 at 10:39 AM, Chris Gray > > wrote: > > > I always use tunnel mode ipv6ip for these questions. Although, I don’t > > exactly know why! I didn’t think of using GRE and am slightly surprised > it > > works. I was taught to use this method at a boot camp. > > > > Another area to research some more! > > > > Chris > > > > > > > > —–Original Message—– > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of > > Dennis Worth > > Sent: 31 May 2008 15:17 > > To: CCIE3000 > > Cc: Cisco certification > > Subject: Re: IPV6 Tunnelling > > > > I would add in dynamic with 6to4 tunnel to the mix. RFC 3056 should help > > along with : > > > > > > > http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-tunnel_ps64 > > 41_TSD_Products_Configuration_Guide_Chapter.html#wp1037465 > > > > HTH > > > > On Sat, May 31, 2008 at 6:14 AM, CCIE3000 > wrote: > > > > > Just checking to see that I’ve got this straight in my head. > > > > > > When a question has wording along the lines of: > > > > > > Configure IPv6 tunnel over IPv4 network > > > > > > We should use tunnel mode gre ? > > > > > > From the follwoing debugs with tunnel mode ipv6ip I get the following: > > > l13: IPv6/IP encapsulated 150.1.3.3->150.1.1.1 (linktype=79, len=92) > > > *May 31 12:55:37.277: Tunnel13: IPv6/IP to classify > > > 150.1.1.1->150.1.3.3(len=92 ttl=253 tos=0xE0) > > > *May 31 12:55:37.277: Tunnel13: to decaps IPv6/IP packet 150.1.1.1-> > > > 150.1.3.3 (len=92, ttl=253) > > > *May 31 12:55:37.277: Tunnel13: decapsulated IPv6/IP packet > > > > > > With tunnel mode gre I get the following: > > > *May 31 12:58:11.573: Tunnel13: GRE/IP encapsulated > > > 150.1.3.3->150.1.1.1(linktype=79, len=124) > > > *May 31 12:58:11.609: Tunnel13: GRE/IP to classify > > > 150.1.1.1->150.1.3.3(len=124 type=0×86DD ttl=253 tos=0×0) > > > > > > Also using debug ip packet detail I’m seeing protocol 47 with GRE and > > > protocol 41 when ipv6ip. > > > > > > Firstly, am I correct to use mode gre and secondly any tips on what to > > look > > > for in a question to decide the tunnel mode if it’s not stated? > > > Thanks, > > > > > > > > > _______________________________________________________________________ > > > Subscription information may be found at: > > > http://www.groupstudy.com/list/CCIELab.html > > > > > > > > > > > > > > > > > > > > > — > > Dennis Worth > > > > > > _______________________________________________________________________ > > Subscription information may be found at: > > http://www.groupstudy.com/list/CCIELab.html > > > > > > _______________________________________________________________________ > > Subscription information may be found at: > > http://www.groupstudy.com/list/CCIELab.html > > > > > > > > > > > > > — > Narbik Kocharians > CCSI#30832, CCIE# 12410 (R&S, SP, Security) > www.Net-Workbooks.com > Sr. Technical Instructor > > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html