I have a device A @ 192.168.100.230 that is programmed to communicate to device B @ 192.168.100.100. Device B was upgraded and as a consequence device A is unable to establish communications withe device B. My plan is to install device C @ 192.168.100.235 which is compatible to communicate with device A as an interpreter, but since I an unable to change the programming of Device A to communicate to a different IP address is there a way to redirect traffic from device A going to 192.168.100.100 to 192.168.100.235.
Layer 2 network
Device A ETH1
Device B accessible through SFP1 and SFP2 (Ring with RSTP)
Device C ETH2
Right now this router is acting like a switch with all ports bridged and is part of a ring with other switches and routers.
Configure the router with a separate /32 subnet and interface with device A plugged into it.
(Assuming router described is Mikrotik, Probably just remove ETH1 from the bridge)
This subnet/interface is added as a member of the LAN interface list.
(And removed from WAN interface list membership if necessary)
The new subnet/interface IP address will be 192.168.100.xxx/32 network 192.168.100.230/32
The main LAN/bridge interface has 192.168.100.0/24 configured on it (presumably as current)
Both interfaces have an IP addresses (different) in the 192.168.100.0/24 range assigned to them.
Both interfaces have proxy arp enabled. (Important)
Then create a new dst-NAT rule:
Traffic from 192.168.100.230 to 192.168.100.100 is dst-natted to 192.168.100.235