link two networks with same ip network FWSM

Unanswered Question
praprama Tue, 08/17/2010 - 08:22

Hi,

For starters, here is a document giving all information regarding configuring NAT with FWSM version 3.2:

http://www.cisco.com/en/US/docs/security/fwsm/fwsm32/configuration/guide/cfgnat_f.html

The 2 IP networks that you are referring, do you need complete 2-way communication between them or is it just going to be 1-way communication? if it is going to be 2-way communication, you will meed to statically translate both the networks to different subnets. That is assuming the follwing:

IP network: A/24

FWSM1:

static (in,out) B A netmask 255.255.255.0

FWSM2:

static (in,out) C A netmask 255.255.255.0

Now the IP network A in FWSM1 when trying to access the network behind FWSM2, they will actually need to specify the destination P in the subnet C (because of the static NAT) and also the source IP will get translated to an IP in the subnet B.

When the network behind FWSM2 tries to do the same, the destination will be specified in subnet B and the source IP will get translated to the subnet C.

We need to ensure all the corresponding ACLs and routing reflect these 2 IP subents, B and C.

Again, I am assuming that this is your network requirement and i hope i am correct Do send your detailed requirement if this is not the case and we can recommedations based on that.

All the best!!

Thanks and Regards,

Prapanch

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