From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Thu Oct 13 2005 - 06:40:23 GMT-3
Thank Simon!, Sorry my English su**s
Maurlio de Paula Gorito Cisco Book, Are real hard to understand !
Thanks to all, I learn a lot in this session !
simon hart wrote:
>Okay Victor,
>
>I know see where you are coming from. You could use LAM here.
>
>So on R1 you still configure it with no ip routing, and a default-gateway of
>10.50.50.2 . R1 e0/0 will have the address of 10.50.50.1
>
>On R2's ethernet interface you can configure ip mobile arp (access group if
>you wish to limit this just to R1).
>
>Redistribute mobile in R2's ospf process.
>
>Okay here will the sequence of events, if R1 is trying to ping R3's ip
>address (for the sake of arguement 192.168.0.1)
>
>R1 will arp request for 192.168.0.1 on its e0 interface as it believes this
>where the default-gateway resides. R2 will proxy-arp reply with its mac
>address by virtue of the fact of ip mobile arp - this will only happen if R2
>has an entry for the 10.50.50.x network in its routing table (or a summary
>that encompasses that range), otherwise R2 will not proxy arp reply.
>
>R1 will send the ip packet to R2, R2 will then forward to R3
>
>R3 can respond by virtue of the fact that it has installed a host route for
>10.50.50.2 in its routing table, this pointing back to R2.
>
>So in this situation R1 can ping all of R3's interfaces. The gotcha here is
>that R2 MUST have the network 10.50.50.x in its rib otherwise it will not
>work.
>
>Also this does not take into account the fact that other interfaces of R1
>(ie loopbacks) will not be reachable (which has got some hot under the
>collar)
>
>HTH
>
>Simon
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>Victor Cappuccio
>Sent: 13 October 2005 09:24
>To: Victor Cappuccio
>Cc: simon hart; De Witt, Duane; Javier Tomi; Cisco certification
>Subject: Re: Router with out any routing Protocol
>
>
>Uppss Sorry I forgot to add this IP MOBILE ARP
>
>R1 Eht0/0 IP Address 10.50.50.1/29
> Eth0/0 IP Address 10.0.0.1/8 Secondary
>ARP R3 Int X n/n MAC-ADD R2 ETH
>================================
>Ethernet Media
>===================================
>IP MOBILE ARP 10.50.50.0 /29 (off course this is an ACL)
>R2 Eth0/0 IP Address 10.60.60.2/29
>redistribute mobile to OSPF (This would help R3 with the return traffic)
>===================================
>Cloud Running OSPF
>===================================
>R3
>
>Victor Cappuccio wrote:
>
>
>
>>Hello Simon, You are very right, but the problem here is that this PC
>>(R1) is on a different subnet, than R2, and original question was that
>>R1 needs a way to ping all R3 Interfaces..
>>
>>So
>>R1 Eht0/0 IP Address 10.50.50.1/29
>> Eth0/0 IP Address 10.0.0.1/8 Secondary
>>ARP R3 Int X n/n MAC-ADD R2 ETH
>>================================
>>Ethernet Media
>>===================================
>>R2 Eth0/0 IP Address 10.60.60.2/29
>>redistribute mobile to OSPF (This would help R3 with the return traffic)
>>===================================
>>Cloud Running OSPF
>>===================================
>>R3
>>
>>So maybe I think that I have to change the Subject of this email, to
>>LAM Question.
>>
>>Thanks
>>Victor
>>
>>simon hart wrote:
>>
>>
>>
>>>I am not sure why you are all looking into things like LAM & ODR etc to
>>>accomplish what is a relatively simple task.
>>>
>>>The original question was the R1 does not run any routing protocol but to
>>>have connectivity to all of R3.
>>>
>>>With such a question look for the obvious first. R1 must behave like a
>>>host, such as PC. PC's do not run routing protocols but should be able to
>>>ping everything within it's associated network, it does this without
>>>
>>>
>LAM/ODR
>
>
>>>etc etc. So how does a PC gain this connectivity, well it has a default
>>>gateway, that is an associated device that will find the path for it (AKA
>>>router).
>>>
>>>So we need to make R1 behave like a PC. Simple turn off ip routing
>>>
>>>no ip routing
>>>
>>>As soon as that command is entered the router will never ever run a
>>>
>>>
>routing
>
>
>>>protocol.
>>>
>>>Okay now how to packets get out of the router, easy:-
>>>
>>>ip default-gateway R2's IP address.
>>>
>>>This is really the only answer that is being looked for. Looking into
>>>anything else is playing with semantics and rather confusing, and I am
>>>
>>>
>sure
>
>
>>>does not help with learning
>>>
>>>HTH
>>>
>>>Simon
>>>
>>>-----Original Message-----
>>>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>>>De Witt, Duane
>>>Sent: 13 October 2005 08:07
>>>To: Javier Tomi
>>>Cc: Cisco certification
>>>Subject: RE: Router with out any routing Protocol
>>>
>>>
>>>Hi
>>>
>>>I think it would be best to do things in steps here. I'm not disputing how
>>>LAM works here, but we need layer 3 connectivity with some sort of routing
>>>running between R1 and R2 before we can even start thinking about LAM. If
>>>
>>>
>R1
>
>
>>>and R2 are in different subnets we have a straight forward layer 3 problem
>>>which needs to be resolved before adding complex things like LAM on top of
>>>it.
>>>
>>>-----Original Message-----
>>>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>>>Javier Tomi
>>>Sent: 13 October 2005 08:43 AM
>>>Cc: 'Cisco certification'
>>>Subject: Re: Router with out any routing Protocol
>>>
>>>Correct me if I am wrong, but with LAM There is no need of both routers
>>>to be on the same network. R2 will install a host route to the IP
>>>address of R1, and due to proxy-arp configured on R2, it will response
>>>to ARP request from R1 searching his default gateway. Of course, R2 will
>>>need a route to R1 network by some means.... Isn't it?
>>>
>>>
>>>
>>>
>>>Victor Cappuccio wrote:
>>>
>>>
>>>
>>>
>>>
>>>>OK, Thanks in advanced.. Any other comments
>>>>
>>>>
>>>>De Witt, Duane wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>No, R2 will still be looking for something in it's own subnet as far
>>>>>as I know. I'll lab it up later and check, just busy with IEWB at the
>>>>>moment.
>>>>>
>>>>>
>>>>>
>>>>>------------------------------------------------------------------------
>>>>>
>>>>>*From:* Victor Cappuccio [mailto:cvictor@protokolgroup.com]
>>>>>*Sent:* 13 October 2005 08:28 AM
>>>>>*To:* De Witt, Duane
>>>>>*Cc:* Cisco certification
>>>>>*Subject:* Re: Router with out any routing Protocol
>>>>>
>>>>>
>>>>>
>>>>>Hello Duane, Many Thanks for your replys, maybe I'm saying something
>>>>>stupid here, but R1 haves a 10.0.0.1 /8 as a secondary address..
>>>>>And by adding this I will cover all subnets, right?
>>>>>
>>>>>Thanks again
>>>>>Victor.
>>>>>
>>>>>
>>>>>
>>>>>De Witt, Duane wrote:
>>>>>
>>>>>R1 and R2 aren't in a common subnet, so I'm not sure what you are
>>>>>trying to achieve?
>>>>>
>>>>>
>>>>>
>>>>>------------------------------------------------------------------------
>>>>>
>>>>>*From:* Victor Cappuccio [mailto:cvictor@protokolgroup.com]
>>>>>*Sent:* 13 October 2005 08:19 AM
>>>>>*To:* De Witt, Duane
>>>>>*Cc:* Cisco certification
>>>>>*Subject:* Re: Router with out any routing Protocol
>>>>>
>>>>>
>>>>>
>>>>>I wish to have a CCIE rack to play but for now, I just have a 3640
>>>>>gift from a good Friend... (I know that only with one router would
>>>>>not let me understand anything but it's cool to check weird
>>>>>configurations or command parameters / Do someone from the other side
>>>>>of the world (My time zone is GMT -4) have a rack that does not uses
>>>>>in the night and be so generous to share it? :-) )
>>>>>
>>>>>R1:
>>>>>interface FastEthernet0/0
>>>>>ip address 10.0.0.1 255.0.0.0 secondary
>>>>>! Thats why I told about to create a secondary address - I did not
>>>>>finish the idea when I sent the email / I Think I'm getting Crazy with
>>>>>all this stuffs.. Sorry for that
>>>>>ip address 10.50.50.2 255.255.255.248
>>>>>speed 100
>>>>>full-duplex
>>>>>
>>>>>R2:
>>>>>interface FastEthernet4/0
>>>>>ip address 10.60.60.1 255.255.255.248
>>>>>ip mobile arp access-group 2
>>>>>duplex full
>>>>>
>>>>>
>>>>>access-list 2 permit 10.50.50.2
>>>>>
>>>>>De Witt, Duane wrote:
>>>>>
>>>>>I don't think this scenario would work. LAM would require R1 and R2
>>>>>
>>>>>ethernet to be in the same subnet, however it will allow users on R1
>>>>>
>>>>>ethernet to be on a subnet allocate somewhere else in the network.
>>>>>
>>>>>
>>>>>
>>>>>If R1 and R2 ethernet are in different subnets how will you get
>>>>>
>>>>>communication going between the two?
>>>>>
>>>>>
>>>>>
>>>>>-----Original Message-----
>>>>>
>>>>>From: nobody@groupstudy.com <mailto:nobody@groupstudy.com>
>>>>>
>>>>>
>>>>>
>>>>>
>>>[mailto:nobody@groupstudy.com] On Behalf Of
>>>
>>>
>>>
>>>
>>>>>Victor Cappuccio
>>>>>
>>>>>Sent: 13 October 2005 07:50 AM
>>>>>
>>>>>Cc: Cisco certification
>>>>>
>>>>>Subject: Re: Router with out any routing Protocol
>>>>>
>>>>>
>>>>>
>>>>>Ok this one was easy, lets change the Scenario a little bit, using the
>>>>>
>>>>>same same topology, but now R1 is in a different Subnet than R2, so now
>>>>>
>>>>>we need to configure LAM on R2, and Redistributing the mobile into the
>>>>>
>>>>>ospf gives R3 the way to get to R1, but what about the return traffic R1
>>>>>
>>>>>
>>>>>
>>>>>-> R3?
>>>>>
>>>>>
>>>>>
>>>>>Thanks
>>>>>
>>>>>Victor.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>manoj menon wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>On R1#
>>>>>>
>>>>>>
>>>>>>
>>>>>>no ip routing
>>>>>>
>>>>>>!
>>>>>>
>>>>>>ip default-gateway <R2-E0-IP_ADD>
>>>>>>
>>>>>>!
>>>>>>
>>>>>>Either you can advertise the R1-R2 Ethernet subnet in OSPF, or
>>>>>>
>>>>>>redistribute, or static route back to R1, and redistribute static into
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>OSPF...
>>>>>>
>>>>>>
>>>>>>
>>>>>>Comments...
>>>>>>
>>>>>>
>>>>>>
>>>>>>Regards,
>>>>>>
>>>>>>Mnaoj
>>>>>>
>>>>>>
>>>>>>
>>>>>>*/Victor Cappuccio <cvictor@protokolgroup.com>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>><mailto:cvictor@protokolgroup.com>/* wrote:
>>>
>>>
>>>
>>>
>>>>>> Hello People, consider this Scenario
>>>>>>
>>>>>>
>>>>>>
>>>>>> 10.1.1.0/24
>>>>>>
>>>>>> R1 --- Ethernet --- R2 | Network Cloud Running OSPF | R3.
>>>>>>
>>>>>> ---Vlan 50 ----
>>>>>>
>>>>>>
>>>>>>
>>>>>> You are not allowed to configure any routing protocol on R1, but
>>>>>>
>>>>>> one of
>>>>>>
>>>>>> the requirements is that R1 should be able to ping any ip address
>>>>>>
>>>>>> in R3,
>>>>>>
>>>>>> how would you accomplish this? I thought to create a secondary
>>>>>>
>>>>>> address
>>>>>>
>>>>>> in R1 with an IP Classful Address Mask (10.0.0.1/8) and complete
>>>>>>
>>>>>> the ARP
>>>>>>
>>>>>> Table for R3 physical interfaces with R2 Ethernet Mac Address
>>>>>>
>>>>>> (since R2
>>>>>>
>>>>>> knows the complete network).- I Think this could work Ok / Have
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>not
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> tested yet .. Can you see another was of accomplishing this task?
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> Regards
>>>>>>
>>>>>> Victor.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>_______________________________________________________________________
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
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>>>>>>
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>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>------------------------------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
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>>>
>>>>>_______________________________________________________________________
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>>>>>
>>>>>
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>>>>
>>>>
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