Using VLANs so segregate traffic with machines with identical IP address

5 pts.
Tags:
IP address
Managed Switches
VLAN
VLAN Setup
I am a newbie: I have four boxes A1,A2,A3,A4 that need to communicate with 4 other boxes B1,B2,B3,B4 with these "permutations": A1 needs to communicate with B1,B2,B3,B4 A2 needs to communicate with B1,B2,B3,B4 A3 needs to communicate with B1,B2,B3,B4 A4 needs to communicate with B1,B2,B3,B4 For technical reasons A1,A2,A3,A4 have the same IP addresses (and this cannot be changed). B1,B2,B3,B4 all have different IP addresses. Is it possible to define VLANs: V1: A1,B1,B2,B3,B4 V2: A2,B1,B2,B3,B4 V3: A3,B1,B2,B3,B4 V4: A4,B1,B2,B3,B4 so that the traffic is properly segregated and A1,A2,A3,A4 having the same IP address is not a problem ? Note: One acceptable limitation would be that the switch "translates" the IP addresses of A1, A2, A3, A4 to fixed+reproducable+known new unique IP addresses during send/receive operations respectively (for B1,B2,B3,B4 I can specify the source and destination IP addresses for both directions send/receive as they decode the ethernet frames on a low protocol level, they don't run the "default" TCP/IP stack). Additionally, I need to be able to define an alternative configuration: V1: A1,B1 V2: A2,B2 V3: A3,B3 V4: A4,B4 If all of the above is possible, can someone point me to a (managed) switch that for once allows such VLAN configuration based on ports, in addition allows to fix the port speed for each port (another restriction that I have), allows to save and restore different configurations (see the 2 alternatives) and additionally has a HTTP based web interface for configuration ? Thanks for any help, Lars Erdmann
ASKED: July 28, 2009  8:47 PM
UPDATED: July 28, 2009  9:04 PM

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This won’t work without doing some NAT’s on each of the A boxes (which you allude to in your question). You will need a router or some other device (firewall) to provide a NAT or mapped IP address for each of these hosts and then you will be able to communicate from the A hosts to the B hosts. Having the same IP address on the same LAN is very much an issue and the B network hosts would get confused communicating back to the A hosts unless the source addresses were different.

The real question is WHY do the IP addresses of the A hosts have to be the same?

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