Can RNRP cause a connection to a Router to be lost in the ARP table
In general, RNRP manipulates the routing table (route print) not ARP table (arp -a).
Per default, RNRP cares about internal networks only and does not manipulate any external routes. BUT, by specifying "External router" settings RNRP will inject a default gateway.
Additionally, RNRP enables "Disable ICMP Redirect" in Microsoft Windows IP stack which prevents ICMP Redirects from influencing the routing table. So RNRP actually attempts to reduce external influences.
To be able to tell more I need:
- Network configuration of involved NICs
- RNRP configuration
- Output from "route print" and "arp -a" commands before and during problem
- A short description of your apps comms needs & problems