From: Chris Lewis \(chrlewis\) (chrlewis@cisco.com)
Date: Tue Jul 19 2005 - 12:58:55 GMT-3
Dillon,
Not exactly. NAT can be used such that advertizing routes are not
necessary. Consider the following: R1, R2, R3 and R4 are connected in a
cloud and run an IGP between them. R4 connects to a backbone router that
does not have any knowledge of any routes within the R1 - R4 cloud. What
can you do to enable all routers within the cloud to ping the backbone?
Assuming the R4 to BB router link is in the IGP of the cloud, all
routers within the cloud will be able to send a packet to the BB router,
but the BB router will not be able to return it. However, if you do
overload on the R4 interface facing the BB router to translate all
source addresses to that address, the BB router will be able to return
the ping, as all it is doing is returning a packet to an address on a
directly connected link. It is not until R4 gets that packet back that
the address is translated to the "real" address of the router
originating the ping.
As an example, if R4 is using the ATM1/0 interface to connenct to the BB
router, this config will do the work described above.
ip nat inside source list 1 int atm1/0 overload
access-list 1 permit any
Chris
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Dillon Yang
Sent: Tuesday, July 19, 2005 10:26 AM
To: Ozgur Guler
Cc: Group Study
Subject: Re: Routes not participating routing protocol
Hi, Ozgur:
Thanks for reply. I think your solution is about how to get the
destinatio, but the more important thing is how to advertise it also.
TIA
dillon
----- Original Message -----
From: "Ozgur Guler" <ozgur.guler@milleni.com.tr>
To: "Dillon Yang" <dillony@gmail.com>
Cc: "Group Study" <ccielab@groupstudy.com>
Sent: Tuesday, July 19, 2005 10:40 PM
Subject: RE: Routes not participating routing protocol
You can also use NAT, PBR in such a scenario.
Ozgur Guler
CCIE #13237
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Dillon Yang
Sent: Tuesday, July 19, 2005 10:55 AM
To: Group Study
Subject: Routes not participating routing protocol
Hi, group:
For task about Routes that do not participating routing protocol
should be accessible by other, I have the only knowledge as followed:
[route to 10.7.7.0/24]
1. redistribute connected at the local router.
2. generate a 0.0.0.0/0 to other routers.
3. At the upstream router, make one of the subnet-10.7.7.254-as the
secondary address and advertise it and use "arp" command to direct the
traffic to the router that has connected interface in 10.7.7.0/24.
4. use ODR that I am not sure whether it is a routing protocol and
violate the requirement.
Any more advices about this or similar?
TIA
dillon
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