12-02-2008 04:23 AM - edited 03-04-2019 12:33 AM
Hi,
I have question about NAT and routing NAT-ed address over EIGRP. If i NAT source host on Router A, Router B will see this network as it is and i would like it to learn NAT-ed address so it can return packets for it withaout static routes. Is this posible?
BR
Filip
12-02-2008 04:30 AM
Filip
Not clear exactly what you mean. Do you mean you want Router B to see 172.16.200.2 address without having to add a static route for it ?
If so, simplest solution is to create a loopback interface on Router A from same subnet and advertise with EIGRP eg.
Router A
int loopback 10
ip address 172.16.200.1 255.255.255.0
router eigrp 1
network 172.16.200.0 0.0.0.255
Jon
12-02-2008 05:15 AM
Hi Jon,
Yes this is workaroud but if i have more subnets learned on Routera A and they are translated than i would have more Loopback interfaces or class B interface.
for excapmle NAT
10.221.31.231/24 --> 172.16.31.231
10.221.224.9/29 -->172.16.200.3
10.221.224.65/29 -->172.16.200.4
10.221.225.9/29 -->172.16.201.5
10.221.226.65/29 -->172.16.201.6
10.221.46.231/24 -->172.16.46.231
Then i would have to make Loopback Interface with calss B, is there any other way to do it?
BR
Filip
Filip
12-02-2008 05:21 AM
Filip
You need to get the Natted IP subnets into the EIGRP routing table. So you can
1) have static route for each subnet on Router A and redistribute into EIGRP
2) As previously suggested - create loopbacks.
Could you perhaps plan your IP addressing of the NAtted subnets so you use just one loopback interface - remember you are never going to be routing to that interface
OR
int loopback 10
ip address 172.16.1.1 255.255.0.0
router eigrp 1
network 172.16.0.0
this would as you say allow you to use any 172.16.x. subnet altho i would recommend using a subset of 172.16.0.0 rather than the whole thing.
Jon
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